Durban, South Africa

+27 (0)83 381 3655

andrew@exegetic.biz

www.linkedin.com/in/datawookie

twitter.com/datawookie

github.com/datawookie

datawookie.netlify.com/blog/

+27 (0)83 381 3655

andrew@exegetic.biz

www.linkedin.com/in/datawookie

twitter.com/datawookie

github.com/datawookie

datawookie.netlify.com/blog/

Exegetic Analytics | Founder & Lead Data Scientist | 2017 - present |

DataCamp | Instructor | 2018 - present |

Toptal | Freelance Data Scientist | 2016 - present |

Derivco | Senior Data Scientist | 2015 - 2017 |

Derivco | Game Mathematician | 2013 - 2015 |

University of Bergen (Norway) | Researcher | 2013 - 2014 |

University of KwaZulu-Natal (UKZN) | Honorary Senior Lecturer | 2004 - 2015 |

South African National Space Agency | Senior Researcher | 2010 - 2013 |

Hermanus Magnetic Observatory (HMO) | Postdoctoral Researcher | 2006 - 2010 |

University of Natal | Antarctic Research Fellow | 2001 - 2004 |

SCK·CEN (Belgium) | Scientist | 2000 - 2001 |

Blue Star Consultants (Netherlands) | Consultant | 1999 - 2000 |

Atomic Energy Corporation | Scientist | 1995 - 1999 |

Department of Environmental Affairs | Antarctic Expedition Member | 1994 - 1995 |

More details of these positions can be found on my LinkedIn profile.

A selection of training courses I have given recently:

- Introduction to Deep Learning, The Wanderers Club, Johannesburg, October 2019.
- Machine Learning with R, The Sett, Durban, September 2019.
- SQL Server 2019 Big Data Cluster, SQL Saturday, Cape Town, September 2019.
- SQL Server 2019 Big Data Cluster, SQL Saturday, Johannesburg, September 2019.
- Introduction to Data Science with R, Bandwidth Barn, Cape Town, June 2019.
- Version control with Git, UKZN Software Carpentry Workshop (Durban), December 2018.
- Introduction to SQL, Democratic Alliance (Cape Town), October 2018.
- Machine Learning with Python, PyCon (Johannesburg), October 2018.
- Introduction to Spark, Vantage Data, September 2018.
- Automated Reporting with R: Essentials, Thermo Fisher (Hennigsdorf, Germany), July 2018.
- Building Packages with R: Essentials, Thermo Fisher (Hennigsdorf, Germany), July 2018.
- Data Science with R: Beginners’ Course, Investec (Johannesburg), June 2018.
- Web Scraping with R, Rise (Cape Town), June 2018.
- Web Scraping with Python, PyCon (Cape Town), October 2017.
- Data Science (Head Teacher) , iXperience, 2016, 2017 and 2018.

I created and maintain the Machine Learning with Apache Spark course on DataCamp.

Conferences I have organised: satRday *Johannesburg* (2019) and satRday *Cape Town* (2018 and 2017).

PhD | Space Physics | Royal Institute of Technology, Stockholm | 2006 |

Thesis: VLF and ULF Waves Associated with Magnetospheric Substorms | |||

Licentiate | Space Physics | Royal Institute of Technology, Stockholm | 2004 |

Thesis: VLF Chorus Activity Associated with Substorm Particle Injections | |||

MSc | Physics | Potchefstroom University | 1998 |

Thesis: Application of a Hybrid Monte Carlo Method to Neutral Particle Transport in Slab Geometry | |||

BSc (Honours) | Physics | University of Natal | 1993 |

BSc | Physics & Mathematics | University of Natal | 1992 |

- R
- Python
- SQL
- Data Science; Data Analysis; Machine Learning; Web Scraping
- Linux, bash (and associated shell tools), regular expressions
- Amazon Web Services (AWS) and Azure
- Version Control and Git
- Training and mentoring
- Explaining complex topics to expert and lay audiences

- Shiny
- Spark
- Stan (with PyStan and RStan)
- Django, Hugo, Jekyll, Bootstrap, HTML, CSS and SASS
- Docker
- Continuous Integration

- Julia, C, C++ and FORTRAN
- Tableau
- GIS

My interests include: R, data, web development, running (road and trail), photography, gardening, food (especially garlic, capers and red wine).

- A. B. Collier, There will be Data: Scraping the Web with Python, PyConZA, Johannesburg, October 2019.
- A. B. Collier, Better BASHing: How to get the most out of the shell, LinuxConf [ZA], Johannesburg, October 2019.
- A. B. Collier, Web Scraping with Python, SQL Saturday, Cape Town, September 2019.
- A. B. Collier, Web Scraping with R, SQL Saturday, Johannesburg, September 2019.
- A. B. Collier, "Apache Spark #2: Structured Data, DataFrames & SQL", Durban Artificial Intelligence Meetup, Durban, 15 July 2019.
- A. B. Collier, "Apache Spark #1: Unstructured Data and RDDs", Durban Artificial Intelligence Meetup, Durban, 27 May 2019.
- A. B. Collier, "Deploying a Plumber API with Docker", satRday, Johannesburg, 6 April 2019.
- A. B. Collier, "Automated Reporting", satRday, Paris, 23 February 2019.
- A. B. Collier, "Automated Reporting", Lunch & Learn, Aldwych House WeWork, London, 21 February 2019.
- A. B. Collier, "A Gentle Introduction to Bayesian Methods with Python", Breizh Data Day, Rennes, France, 19 October 2018.
- A. B. Collier, "Bayesian Analysis in Python: A Starter Kit", PyCon, Johannesburg, 12 October 2018.
- A. B. Collier, "Machine Learning with Python" (1 day workshop), PyCon, Johannesburg, 10 October 2018.
- A. B. Collier, "Wading into Stream Analytics", SQL Saturday (Durban), 15 September 2018.
- A. B. Collier, "Wading into Stream Analytics", SQL Saturday (Cape Town), 8 September 2018.
- A. B. Collier, "Wading into Stream Analytics", SQL Saturday (Johannesburg), 1 September 2018.
- A. B. Collier, "First Steps with Stan", Derivco Brown Bag, 24 August 2018.
- A. B. Collier, "Getting Started with Bayesian Techniques in Julia" (poster), JuliaCon, 9 August 2018.
- A. B. Collier, Moderator for Storytelling With Data Science panel discussion hosted by Toptal, 26 July 2018.
- A. B. Collier, and E. F. Collier, "Setting up WordPress with AWS", WordPress Jo'burg, 17 July 2018.
- A. B. Collier, "Data Science in the Cloud: Getting Started", Berlin R Users Group, 10 July 2018.
- A. B. Collier, "Interfacing R and Python", PyData (Berlin), 8 July 2018. [slides]
- A. B. Collier, "Data Science in the Cloud: Getting Started", R-Ladies Cape Town, 19 June 2018.
- A. B. Collier, "Taking the Bayesian Leap", eRum, Budapest, Hungary, 15 May 2018. [slides]
- A. B. Collier, "Getting Involved with the R Community", RCCP eConversations, 20 April 2018.
- A. B. Collier, Moderator for The Future of ICOs panel discussion hosted by Toptal, 11 April 2018.
- A. B. Collier, "Data Science Productivity Hacks." satRday, Cape Town, South Africa, 17 March 2018. [slides]
- A. B. Collier, "Running an Ethereum Node." Durban Ethereum Meetup, Derivco, Durban, South Africa, 31 January 2018.
- A. B. Collier, "Hello Durban, tell me how you're doing!" Digifest, Durban University of Technology, Durban, South Africa, 2017.
- A. B. Collier, and K. Tirok, "Introduction to R." (1 day workshop) Department of Public Health, University of KwaZulu-Natal, Durban, South Africa, 2017.
- A. B. Collier, "Web Scraping with Python" (1 day workshop), PyCon, Cape Town, October 2017.
- A. B. Collier, "Diagnosing the Long Distance Runner with Django, D3 and R." Bulgaria Web Summit, Sofia, Bulgaria, 2017.
- A. B. Collier, and P. Oxborrow, "Wordpress by Dummies," Derivco Brown Bag, 26 October 2016.
- A. B. Collier, "#PredictiveAnalytics," Derivco Brown Bag, 25 May 2016.
- A. B. Collier, and W. van Deventer, "Jungle Jim and the Hypergeometric Animations," Derivco Brown Bag, 10 April 2015.
- A. B. Collier, "Innovation and Invention," Derivco Brown Bag, 12 March 2015.
- A. B. Collier, "RNG: From Trinity to Table Games," Derivco Brown Bag, 30 September 2014.
- A. B. Collier, "Lightning Activity Predictions for Single Buoy Moorings," in
*58th Annual Conference of the South African Institute of Physics*, Richard's Bay, South Africa, 2013. - A. B. Collier, "Clustering Lightning Discharges to Identify Storms", LIGHTS 2013 Conference, Johannesburg, 2013.
- A. B. Collier, "Global Lightning Detection with WWLLN," in
*NASSP Colloquim*, University of Cape Town, Cape Town, 2012. - A. B. Collier, J. Lichtenberger, C. J. Rodger, M. A. Clilverd, and B. Delport, "Possible Whistler Source Lightning from Correlations," in
*PLASMON Workshop*, Hermanus, South Africa, 2012. - A. B. Collier, C. J. Rodger, M. A. Clilverd, and B. Delport, "Narrowband VLF Observations as Validation of Plasmaspheric Model," in
*5th VERSIM Workshop*, São Paulo, Brazil, 2012. - A. B. Collier, C. J. Rodger, M. A. Clilverd, J. Lichtenberger, and B. Delport, "Narrowband VLF Observations as Validation of Plasmaspheric Model (Invited)," in
*39th COSPAR Scientific Assembly*, Mysore, India, 2012. - A. B. Collier, "Lightning: From Radio Waves to Gamma Rays," Royal Institute of Technology, Stockholm, Sweden, 2011.
- A. B. Collier, T. Gjesteland, and N. Østgaard, "Location of TGF Source Lightning," in
*XXVth IUGG General Assembly*, 2011. - A. B. Collier, T. Gjesteland, and N. Østgaard, "Terrestrial Gamma-Ray Flash Intensity Distribution," in
*XXXth URSI General Assembly*, Istanbul, Turkey, 2011. - A. B. Collier, "VLF Waves as Instigators and Diagnostics of Magnetosphere-Ionosphere Coupling," in
*38th COSPAR Scientific Assembly*, Bremen, Germany, 2010. - A. B. Collier and A. R. W. Hughes, "Sinusoidal Variation of Lightning Activity Over Africa," in
*55th Annual Conference of the South African Institute of Physics*, Pretoria, South Africa, 2010. - A. B. Collier, J. Lichtenberger, and P. Steinbach, "Multivariate Techniques for Constructing Quiet Day Curves," in
*4th VERSIM Workshop*, Prague, Czech Republic, 2010. - A. B. Collier, "Principal Component Analysis of Sub-Ionospheric VLF Propagation Conditions," in
*Proceedings of the 11th International Conference on Ionospheric Radio Systems and Techniques*, Edinburgh Conference Centre, Heriot-Watt University, Scotland, United Kingdom, 2009. - A. B. Collier, "Monitoring the Lower Ionosphere using AWESOME and UltraMSK," in
*IHY-Africa/SCINDA Workshop*, Livingstone, Zambia, 2009. - A. B. Collier, J. Lichtenberger, and S. Bremner, "Principal Component Analysis of Sub-Ionospheric VLF Propagation Conditions," in
*54th Annual Conference of the South African Institute of Physics*, Durban, University of Durban-Westville, 2009. - A. B. Collier, J. Lichtenberger, A. R. W. Hughes, and C. J. Rodger, "Correlation Analysis of Dunedin Whistlers and Global Lightning," in
*54th Annual Conference of the South African Institute of Physics*, Durban, University of Durban-Westville, 2009. - A. B. Collier, A. R. W. Hughes, S. Bremner, B. Delport, J. Lichtenberger, G. McDowell, and C. J. Rodger, "Whistler-Lightning Correlations: Significant or Coincidence?," in
*Proceedings of the XXIX URSI General Assembly*, Chicago, Illinois, 2008. - A. B. Collier, A. R. W. Hughes, J. Lichtenberger, and P. Steinbach, "Whistler-lightning correlations: tetrachoric index and similarity measures," in
*3rd VERSIM Workshop*, Tihany, Hungary, 2008. - A. B. Collier, "Seasonal and diurnal variations of lightning activity over Southern Africa," in
*51st Annual Conference of the South African Institute of Physics*, University of the Western Cape, 2006. - A. B. Collier and T. Eriksson, "ULF pulsations, VLF chorus and the injection of energetic particles," in
*XXVIIIth URSI General Assembly*, New Delhi, India, 2005. - A. B. Collier and A. R. W. Hughes, "Role of Anisotropy in the Simulation of Substorm Chorus Events," in
*EGS-AGU-EUG Joint Assembly*, Nice, France, 2003. - A. B. Collier and A. R. W. Hughes, "A Simple Model for Wave Growth Leading to Substorm Chorus Events," in
*48th Annual Conference of the South African Institute of Physics*, Stellenbosch, 2003. - A. B. Collier, "Modelling and Analysis of Substorm-Related Chorus Events Observed at SANAE," in
*URSI General Assembly*, Maastricht, The Netherlands, 2002. - A. B. Collier and A. R. W. Hughes, "SANAE Observations of Substorm-Related Chorus Events," in
*46th Annual Conference of the South African Institute of Physics*, University of Natal, Durban, 2001. - A. B. Collier, "Monte Carlo Transport Capabilities," in
*43rd Annual Conference of the South African Institute of Physics*, University of Cape Town, Cape Town, 1998. - A. B. Collier, "Application of Quasi-Monte Carlo Methods to the One-Group Albedo Problem for a Half-Space with Anisotropic Scattering," in
*42nd Annual Conference of the South African Institute of Physics*, University of Durban-Westville, Durban, 1997. - A. B. Collier, "Sampling Distance to Collision in Quasi-Monte Carlo Neutral Particle Transport," in
*Proceedings of the Joint International Conference on Mathematical Methods and Supercomputing for Nuclear Applications*, Saratoga Springs, New York, 1997. - A. B. Collier, "The Marion Island Conjugate Experiment," in
*39th Annual Conference of the South African Institute of Physics*, (University of Bophuthatswana), 1994.

- T. Gjesteland, N. Østgaard, S. Laviola, M. M. Miglietta, E. Arnone, M. Marisaldi, F. Fuschino, A. B. Collier, F. Fabro, and J. Montanya, Observation of intrinsically bright Terrestrial Gamma ray Flashes from the Mediterranean basin,
*Journal of Geophysical Research: Atmospheres*, vol. 120, no. 23, 2015. - N. Østgaard, K. H. Albrecthsen, T. Gjesteland, and A. B. Collier, A new population of Terrestrial Gamma-ray Flashes in the RHESSI data,
*Geophysical Research Letters*, 2015. - C. Antel, A. B. Collier, J. Lichtenberger, and C. J. Rodger, Investigating Dunedin whistlers using volcanic lightning,
*Geophysical Research Letters*, vol. 41, 2014. - E. J. Koen, A. B. Collier, and S. K. Maharaj, A particle-in-cell approach to obliquely propagating electrostatic waves,
*Physics of Plasmas*, vol. 21, 2014. - E. J. Koen, A. B. Collier, S. K. Maharaj, and M. A. Hellberg, Particle-In-Cell simulations of ion-acoustic waves with application to Saturn's magnetosphere,
*Physics of Plasmas*, vol. 21, 2014. - R. S. Nisi, N. Østgaard, T. Gjesteland, and A. B. Collier, An altitude and distance correction to the source fluence distribution of TGFs,
*Journal of Geophysical Research*, vol. 119, no. 10, pp. 8698–8704, 2014. - A. B. Collier, R. Bürgesser, and E. Ávila, Suitable regions for assessing long term trends in lightning activity,
*Journal of Atmospheric and Solar-Terrestrial Physics*, vol. 92, pp. 100–104, 2013. - K. Cresswell-Moorcock, C. J. Rodger, A. Kero, A. B. Collier, M. A. Clilverd, I. Häggström, and T. Pitkänen, A Reexamination of Latitudinal Limits of Substorm-Produced Energetic Electron Precipitation,
*Journal of Geophysical Research*, vol. 118, no. 10, pp. 694–6705, 2013. - A. M. de Boer, A. B. Collier, and R. Caballero, Processes driving thunderstorms over the Agulhas Current,
*Journal of Geophysical Research*, vol. 118, pp. 2220–2228, 2013. - B. Heilig, P. R. Sutcliffe, D. C. Ndiitwani, and A. B. Collier, Statistical study of geomagnetic field line resonances observed by CHAMP and on the ground,
*Journal of Geophysical Research*, vol. 118, pp. 1934–1947, 2013. > - E. J. Koen and A. B. Collier, Mid-latitude Ionospheric Signature of a weak Solar Flare in Winter,
*South African Journal of Science*, vol. 109, no. 1/2, 2013. - J. Lichtenberger, M. Clilverd, B. Heilig, M. Vellanate, J. Manninen, C. J. Rodger, A. B. Collier, A. M. Jorgensen, J. Reda, R. H. Holzworth, and R. Friedel, The plasmasphere during a space weather event: First results from the PLASMON,
*Journal of Space Weather and Space Climate*, vol. 3, 2013. - R. M. Millan, M. P. McCarthy, J. G. Sample, D. M. Smith, L. D. Thompson, D. G. McGaw, L. A. Woodger, J. G. Hewitt, M. D. Comess, K. B. Yando, A. X. Liang, B. A. Anderson, N. R. Knezek, W. Z. Rexroad, J. M. Scheiman, G. S. Bowers, A. J. Halford, A. B. Collier, M. A. Clilverd, R. P. Lin, and M. K. Hudson, The Balloon Array for RBSP Relativistic Electron Losses (BARREL),
*Space Science Reviews*, vol. 179, pp. 503–530, 2013. - N. Østgaard, T. Gjesteland, B. E. Carlsson, A. B. Collier, S. A. Cummer, G. Lu, and H. J. Christian, Simultaneous observations of optical lightning and terrestrial gamma ray flash from space,
*Geophysical Research Letters*, vol. 40, 2013. - B. Delport, A. B. Collier, J. Lichtenberger, C. J. Rodger, M. Parrot, M. A. Clilverd, and R. H. W. Friedel, Simultaneous observation of chorus and hiss near the plasmapause,
*Journal of Geophysical Research*, vol. 117, 2012. - T. Gjesteland, N. Østgaard, A. B. Collier, B. E. Carlson, C. Eyles, and D. M. Smith, A new method reveals more TGFs in the RHESSI data,
*Geophysical Research Letters*, vol. 39, 2012. - E. J. Koen, A. B. Collier, and S. K. Maharaj, Particle-in-cell simulations of beam-driven electrostatic waves in a plasma,
*Physics of Plasmas*, vol. 19, no. 4, 2012. - E. J. Koen, A. B. Collier, and S. K. Maharaj, A simulation approach of high-frequency electrostatic waves found in Saturn's magnetosphere,
*Physics of Plasmas*, vol. 19, no. 4, p. 042102, 2012. - N. Østgaard, T. Gjesteland, R. S. Hansen, A. B. Collier, and B. Carlson, The true fluence distribution of terrestrial gamma flashes at satellite altitude,
*Journal of Geophysical Research*, vol. 117, 2012. - A. B. Collier, T. Gjesteland, and N. Østgaard, Assessing the Power Law Distribution of TGFs,
*Journal of Geophysical Research*, vol. 116, 2011. - A. B. Collier and A. R. W. Hughes, Lightning and the African ITCZ,
*Journal of Atmospheric and Solar-Terrestrial Physics*, vol. 73, no. 16, pp. 2392–2398, 2011. - A. B. Collier and A. R. W. Hughes, A Harmonic Model for the Temporal Variation of Lightning Activity over Africa,
*Journal of Geophysical Research*, vol. 116, 2011. - A. B. Collier, J. Lichtenberger, M. A. Clilverd, P. Steinbach, and C. J. Rodger, Source Region for Whistlers Detected at Rothera, Antarctica,
*Journal of Geophysical Research*, vol. 116, 2011. - H. Dahlgren, K. Å. T. Sundberg, A. B. Collier, E. J. Koen, and S. G. Meyer, Solar flares detected by the new narrowband VLF receiver at SANAE IV,
*South African Journal of Science*, vol. 107, no. 9/10, pp. 1–8, 2011. - T. Gjesteland, N. Østgaard, A. B. Collier, B. E. Carlson, M. B. Cohen, and N. G. Lehtinen, Confining the Angular Distribution of Terrestrial Gamma-ray Flash Emission,
*Journal of Geophysical Research*, vol. 116, 2011. - R. M. Millan, M. McCarthy, D. Smith, R. Lin, M. Hudson, J. Sample, L. Woodger, J. Hewitt, K. Yando, B. Anderson, N. Knezek, J. Scheiman, A. Baker, M. Comess, A. Liang, W. Rexroad, M. A. Clilverd, A. B. Collier, M. Panasyuk, D. McGaw, and L. Thompson, Understanding relativistic electron losses with BARREL,
*Journal of Atmospheric and Solar-Terrestrial Physics*, vol. 73, no. 11-12, pp. 1425–1434, 2011. - O. Okike and A. B. Collier, A multivariate study of Forbush decrease simultaneity,
*Journal of Atmospheric and Solar-Terrestrial Physics*, vol. 73, no. 7-8, pp. 796–804, 2011. - E. E. Ávila, R. E. Bürgesser, N. E. Castellano, A. B. Collier, R. H. Compagnucci, and A. R. W. Hughes, Correlations between deep convection and lightning activity on a global scale,
*Journal of Atmospheric and Solar-Terrestrial Physics*, vol. 72, no. 14-15, pp. 1114–1121, 2010. - A. B. Collier, S. Bremner, J. Lichtenberger, J. R. Downs, C. J. Rodger, P. Steinbach, and G. McDowell, Global lightning distribution and whistlers observed at Dunedin, New Zealand,
*Annales Geophysicae*, vol. 28, no. 2, pp. 499–513, 2010. - J. Lichtenberger, C. Ferencz, D. Hamar, P. Steinbach, C. J. Rodger, M. A. Clilverd, and A. B. Collier, Automatic Whistler Detector and Analyzer system: Implementation of the analyzer algorithm,
*Journal of Geophysical Research*, vol. 115, 2010. - M. A. Clilverd, C. J. Rodger, N. R. Thomson, J. B. Brundell, T. Ulich, J. Lichtenberger, N. Cobbett, A. B. Collier, F. W. Menk, A. Seppälä, P. T. Verronen, and E. Turunen, Remote sensing space weather events: the AARDDVARK network,
*Space Weather*, vol. 7, 2009. - A. B. Collier, B. Delport, A. R. W. Hughes, J. Lichtenberger, P. Steinbach, J. Öster, and C. J. Rodger, Correlation between global lightning and whistlers observed at Tihany, Hungary,
*Journal of Geophysical Research*, vol. 114, 2009. - J. Öster, A. B. Collier, A. R. W. Hughes, L. G. Blomberg, and J. Lichtenberger, J. R. Downs, C. J. Rodger, P. Steinbach, and G. McDowell Spatial correlation between lightning strikes and whistler observations from Tihany, Hungary,
*South African Journal of Science*, vol. 105, no. 5-6, pp. 234–237, 2009. - R. L. Dowden, R. H. Holzworth, C. J. Rodger, J. Lichtenberger, N. Thomson, A. R. Jacobson, E. H. Lay, J. Brundell, T. Lyons, S. O'Keefe, Z. Kawasaki, C. Price, V. Prior, P. Ortega, J. Weinman, Y. Mikhailov, O. Veliz, X. Qie, G. Burns, A. B. Collier, O. Pinto, R. Diaz, C. Adamo, E. Williams, S. Kumar, G. Raga, J. Rosado, E. E. Avila, M. Clilverd, T. Ulich, P. Gorham, T. Shanahan, T. Osipowicz, G. Cook, and Y. Zhao, World-wide lightning location using VLF propagation in the Earth-ionosphere waveguide,
*IEEE Antennas and Propagation Magazine*, vol. 50, no. 5, pp. 40–60, 2008. - M. Kokorowski, E. A. Bering, M. Ruohoniemi, J. Sample, R. H. Holzworth, S. Bale, J. Blake, A. B. Collier, A. R. W. Hughes, E. H. Lay, R. Lin, M. McCarthy, R. M. Millan, H. Moraal, T. O'Brien, G. K. Parks, M. Pulupa, B. Reddell, D. Smith, P. Stoker, and L. Woodger, Magnetospheric electric field variations caused by storm-time shock fronts,
*Advances in Space Research*, vol. 42, no. 1, pp. 181–191, 2008. - A. B. Collier, A. R. W. Hughes, L. G. Blomberg, and P. R. Sutcliffe, Evidence of standing waves during a Pi2 pulsation event observed on Cluster,
*Annales Geophysicae*, vol. 24, no. 10, pp. 2719–2733, 2006. - A. B. Collier, A. R. W. Hughes, J. Lichtenberger, and P. Steinbach, Seasonal and diurnal variation of lightning activity over southern Africa and correlation with European whistler observations,
*Annales Geophysicae*, vol. 24, no. 2, pp. 529–542, 2006. - M. Kokorowski, J. G. Sample, R. H. Holzworth, E. A. Bering, S. D. Bale, J. B. Blake, A. B. Collier, A. R. W. Hughes, E. H. Lay, R. P. Lin, M. P. McCarthy, R. M. Millan, H. Moraal, T. P. O'Brien, G. K. Parks, M. Pulupa, B. D. Reddell, D. M. Smith, P. H. Stoker, and L. Woodger, Rapid fluctuations of stratospheric electric field following a solar energetic particle event,
*Geophysical Research Letters*, vol. 33, no. 20, 2006. - R. A. Marshall, U. S. Inan, T. Neubert, A. R. W. Hughes, G. SÁtori, J. Bór, A. B. Collier, and T. H. Allin, Optical observations geomagnetically conjugate to sprite-producing lightning discharges,
*Annales Geophysicae*, vol. 23, no. 6, pp. 2231–2237, 2005. - T. Neubert, T. H. Allin, E. Blanc, T. Farges, C. Haldoupis, A. Mika, S. Soula, L. Knutsson, O. van der Velde, R. A. Marshall, U. S. Inan, G. SÁtori, J. Bór, A. R. W. Hughes, A. B. Collier, S. Laursen, and I. L. Rasmussen, Co-ordinated observations of transient luminous events during the EuroSprite2003 campaign,
*Journal of Atmospheric and Solar-Terrestrial Physics*, vol. 67, no. 8-9, pp. 807–820, 2005. - K. Å. T. Sundberg, A. R. W. Hughes, A. B. Collier, P. T. I. Eriksson, and L. G. Blomberg, Magnetic field oscillations at SANAE IV related to sudden increases in solar wind dynamic pressure,
*South African Journal of Science*, vol. 101, no. 11, pp. 539–543, 2005. - A. B. Collier and A. R. W. Hughes, Modelling substorm chorus events in terms of dispersive azimuthal drift,
*Annales Geophysicae*, vol. 22, no. 12, pp. 4311–4327, 2004. - A. B. Collier and A. R. W. Hughes, Modelling and analysis of substorm-related chorus events,
*Advances in Space Research*, vol. 34, no. 8, pp. 1819–1823, 2004. - A. B. Collier and A. R. W. Hughes, Digital VLF Recording and Analysis System for SANAE–IV,
*South African Journal of Science*, vol. 98, no. 11, pp. 547–550, 2002. - L. A. Balona, J. B. Hearnshaw, C. Koen, A. B. Collier, I. Machi, M. Mkhosi, and C. Steenberg, Photometry and line profile variations of the peculiar variable γ Doradus,
*Monthly Notices of the Royal Astronomical Society*, vol. 267, pp. 103–110, 1994.

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