About me

I am a postdoctoral research associate employed on the STFC Consolidated Grant working with Dr Robert Fear, looking at Earth's magnetospheric configuration and coupling during periods Northward IMF. I am primarily using Cluster data in conjunction with IMAGE, SSUSI and GUVI to conduct this research.

Outside this, my primary scientific expertise is in Birkeland currents. I am internationally recognised for my research into Birkeland currents with the AMPERE dataset, having contributed a review chapter to an AGU monograph and been invited to speak on the topic internationally, including at the AGU Fall Meeting 2019.

In my other endeavours, I have extensive public engagement experience as PI of the Southampton Planeterrella. I have been Chair of MIST Council since 2019, and have served on the Council since 2015. I am also on the STFC PEER Forum review panel.

Academic history

  • 2016–present: Postdoctoral research with Dr Robert Fear, University of Southampton
  • 2015–2016: Postdoctoral research with Prof Caitriona Jackman, University of Southampton
  • 2012–2015: PhD research with Prof Steve Milan, University of Leicester
  • 2007–2011: MPhys in Physics with Astrophysics, University of Leicester

Research interests

  • Birkeland currents
  • Northward IMF dynamics
  • Substorms
  • Magnetic reconnection
  • The timescale and intensity of solar wind-magnetosphere-ionosphere coupling
  • Public engagement and quantifying its impacts

Notable achievements

Chair of MIST Council

I was elected to MIST Council 2015–21 and elected Chair in 2019.

Southampton Planeterrella

I am the PI of a ~£30k STFC Public Engagement Large Award.

Coxon, Milan and Anderson (2018)

I am the lead author on a key AMPERE review paper.

Coxon et al. (2019)

I demonstrated the timescales of Birkeland currents' reactions for the first time.

My publications so far

2020

  1. Lockwood, M., M. J. Owens, L. A. Barnard, C. E. Watt, C. J. Scott, J. C. Coxon and K. A. McWilliams. 2020. Semi‐annual, annual and Universal Time variations in the magnetosphere and in geomagnetic activity: 3. Modelling, J. Space Weather Space Clim, 10, 61. doi:10.1051/swsc/2020062

  2. Lockwood, M., K. A. McWilliams, M. J. Owens, L. A. Barnard, C. E. Watt, C. J. Scott, A. R. Macneil, J. C. Coxon (2020). Semi-annual, annual and Universal Time variations in the magnetosphere and in geomagnetic activity: 2. Response to solar wind power input and relationships with solar wind dynamic pressure and magnetospheric flux transport. J. Space Weather Space Clim. doi:10.1051/swsc/2020033

  3. Lockwood, M., M. J. Owens, L. A. Barnard, C. Haines, C. J. Scott, K. A. McWilliams and J. C. Coxon (2020). Semi-annual, annual and Universal Time variations in the magnetosphere and in geomagnetic activity: 1. Geomagnetic data. J. Space Weather Space Clim., doi:10.1051/swsc/2020023

  4. Ovodenko, V. B., M. V. Klimenko, I. E. Zakharenkova, A. V. Oinats, D. S. Kotova, A. V. Nikolaev, I. V. Tyutin, D. D. Rogov, K. G. Ratovsky, D. V. Chugunin, P. A. Budnikov, J. C. Coxon, B. J. Anderson, A. A. Chernyshov (2020). Spatial and temporal evolution of different‐scale ionospheric irregularities in Central and East Siberia during the 27–28 May 2017 geomagnetic storm. Space Weather, 18, e2019SW002378. doi:10.1029/2019SW002378

  5. Mooney, M. K., C. Forsyth, I. J. Rae, G. Chisham, J. C. Coxon, M. S. Marsh, D. R. Jackson, S. Bingham, B. Hubert (2020). Examining local time variations in the gains and losses of open magnetic flux during substorms. J. Geophys. Res. Space Physics, 125, e2019JA027369. doi:10.1029/2019JA027369

2019

  1. Fear, R. C., J. C. Coxon, C. M. Jackman (2019). The contribution of flux transfer events to Mercury’s Dungey cycle. Geophys. Res. Lett., 46, 14239–14246. doi:10.1029/2019GL085399

  2. Trenchi, L., J. C. Coxon, R. C. Fear, J. P. Eastwood, M. W. Dunlop, K. J. Trattner, D. J. Gershman, D. B. Graham, Yu. Khotyaintsev, B. Lavraud (2019). Signatures of magnetic separatrices at the borders of a crater flux transfer event connected to an active X‐line. J. Geophys. Res. Space Physics, 124, 8600–8616. doi:10.1029/2018JA026126

  3. Coxon, J. C., R. M. Shore, M. P. Freeman, R. C. Fear, S. D. Browett, A. W. Smith, D. K. Whiter, B. J. Anderson (2019), Timescales of Birkeland currents driven by the IMF. Geophysical Research Letters, 46. doi:10.1029/2018GL081658

  4. Shore, R. M., M. P. Freeman, J. C. Coxon, E. G. Thomas, J. W. Gjerloev, and N. Olsen (2019), Spatial variation in the responses of the surface external and induced magnetic field to the solar wind. Journal of Geophysical Research: Space Physics, 124. doi:10.1029/2019JA026543

2018

  1. Coxon, J. C., S. E. Milan, and B. J. Anderson (2018). A review of Birkeland current research using AMPERE, in Electric Currents in Geospace and Beyond (eds A. Keiling, O. Marghitu and M. Wheatland). doi:10.1002/9781119324522.ch16

  2. Coxon, J. C., M. P. Freeman, C. M. Jackman, C. Forsyth, I. J. Rae, and R. C. Fear (2018). Tailward propagation of magnetic energy density variations with respect to substorm onset times, Journal of Geophysical Research: Space Physics, 123, 4741–4754. doi:10.1029/2017JA025147.

  3. Farinas Perez G., F. R. Cardoso, D. G. Sibeck, W. D. Gonzalez, G. Facsko, J. C. Coxon, and A.D. Pembroke (2018). Generation mechanism for interlinked flux tubes on the magnetopause, Journal of Geophysical Research: Space Physics, 123. doi:10.1002/2017JA024664.

  4. Forsyth, C., M. Shortt, J. C. Coxon, I. J. Rae, M. P. Freeman, N. M. E. Kalmoni, et al. (2018). Seasonal and temporal variations of field‐aligned currents and ground magnetic deflections during substorms, Journal of Geophysical Research: Space Physics, 123. doi:10.1002/2017JA025136.

  5. Milan, S. E., J. A. Carter, H. Sangha, K. Laundal, N. Østgaard, P. Tenfjord, J. Reistad, K. Snekvik, J. C. Coxon, H. Korth, and B. J. Anderson (2018), Timescales of dayside and nightside field‐aligned current response to changes in solar wind‐magnetosphere coupling, J. Geophys. Res. Space Physics, 123. doi:10.1029/2018JA025645

  6. Smith, A. W., C. M. Jackman, C. M. Frohmaier, J. C. Coxon, J. A. Slavin, and R. C. Fear (2018). Evaluating single‐spacecraft observations of planetary magnetotails with simple Monte Carlo simulations: 1. Spatial distributions of the neutral line, J. Geophys. Res. Space Physics, 123, 10109–10123. doi:10.1029/2018JA025958

  7. Smith, A. W., C. M. Jackman, C. M. Frohmaier, R. C. Fear, J. A. Slavin, and J. C. Coxon (2018). Evaluating single spacecraft observations of planetary magnetotails with simple Monte Carlo simulations: 2. Magnetic flux rope signature selection effects, J. Geophys. Res. Space Physics, 123, 10124–10138. doi:10.1029/2018JA025959

2017

  1. Coxon, J. C., I. J. Rae, C. Forsyth, C. M. Jackman, R. C. Fear, and B. J. Anderson (2017). Birkeland currents during substorms: Statistical evidence for intensification of Regions 1 and 2 currents after onset and a localized signature of auroral dimming, Journal of Geophysical Research: Space Physics, 122, 6455–6468. doi:10.1002/2017JA023967.

  2. Fear, R. C., Trenchi, L., Coxon, J. C., and Milan, S. E. (2017). How much flux does a flux transfer event transfer? J. of Geophys. Res. Space Physics, 122, 12,310–12,327. doi:10.1002/2017JA024730.

  3. Milan, S. E., L. B. N. Clausen, J. C. Coxon, J. A. Carter, M.-T. Walach, K. Laundal, N. Østgaard, P. Tenfjord, J. Reistad, K. Snekvik, H. Korth, B. J. Anderson (2017). Overview of solar wind-magnetosphere-ionosphere-atmosphere coupling and the generation of magnetospheric currents, Space Science Reviews. doi:10.1007/s11214–017–0333–0.

2016

  1. Carter, J. A., S. E. Milan, J. C. Coxon, M.-T. Walach, and B. J. Anderson (2016). Average field-aligned current configuration parameterized by solar wind conditions, Journal of Geophysical Research: Space Physics, 121, 1294–1307. doi:10.1002/2015JA021567.

  2. Coxon, J. C., C. M. Jackman, M. P. Freeman, C. Forsyth and I. J. Rae (2016). Identifying the magnetotail lobes with Cluster magnetometer data, Journal of Geophysical Research: Space Physics. doi:10.1002/2015JA022020.

  3. Coxon, J. C., S. E. Milan, J. A. Carter, L. B. N. Clausen, B. J. Anderson, and H. Korth (2016). Seasonal and diurnal variations in AMPERE observations of the Birkeland currents compared to modeled results, Journal of Geophysical Research: Space Physics, 121. doi:10.1002/2015JA022050.

  4. Forsyth, C., I. J. Rae, K. R. Murphy, M. P. Freeman, C.-L. Huang, H. E. Spence, A. J. Boyd, J. C. Coxon, C. M. Jackman, N. M. E. Kalmoni and C. E. J. Watt (2016). What effect do substorms have on the content of the radiation belts?, Journal of Geophysical Research: Space Physics, 121. doi:10.1002/2016JA022620.

  5. Laundal, K. M., I. Cnossen, S. E. Milan, S. E. Haaland, J. C. Coxon, N. M. Pedatella, M. Förster, J. P. Reistad (2016). North–South Asymmetries in Earth’s Magnetic Field: Effects on High-Latitude Geospace, Space Science Reviews. doi:10.1007/s11214–016–0273–0.

2015

  1. Forsyth, C., I. J. Rae, J. C. Coxon, M. P. Freeman, C. M. Jackman, J. Gjerloev and A. N. Fazakerley (2015). A new technique for determining Substorm Onsets and Phases from H-Indices of the Electrojet (SOPHIE), Journal of Geophysical Research: Space Physics. doi:10.1002/2015JA021343.

2014

  1. Coxon, J. C., S. E. Milan, L. B. N. Clausen, B. J. Anderson and H. Korth (2014a). The magnitudes of the regions 1 and 2 Birkeland currents observed by AMPERE and their role in solar wind-magnetosphere-ionosphere coupling, Journal of Geophysical Research: Space Physics. doi:10.1002/2014JA020138.

  2. Coxon, J. C., S. E. Milan, L. B. N. Clausen, B. J. Anderson and H. Korth (2014b). A superposed epoch analysis of the regions 1 and 2 Birkeland currents observed by AMPERE during substorms, Journal of Geophysical Research: Space Physics. doi:10.1002/2014JA020500.

  3. Forsyth, C., C.E.J. Watt, I.J. Rae, A.N. Fazakerley, N.M.E. Kalmoni, M. P. Freeman, P.D. Boakes, R. Nakamura, I. Dandouras, L.M. Kistler, C.M. Jackman, J.C. Coxon and C. Carr (2014). Increases in plasma sheet temperature with solar wind driving during substorm growth phases, Geophys. Res. Lett. doi:10.1002/2014GL062400.

  4. Sergeev, V. A., A. V. Nikolaev, M. V. Kubyshkina, N. A. Tsyganenko, H. J. Singer, J. V. Rodriguez, V. Angelopoulos, R. Nakamura, S. E. Milan, J. C. Coxon, B. J. Anderson and H. Korth (2014). Event study combining magnetospheric and ionospheric perspectives of the substorm current wedge modeling, Journal of Geophysical Research: Space Physics. doi:10.1002/2014JA020522.

2013

  1. Clausen, L. B. N., J. B. H. Baker, J. M. Ruohoniemi, S. E. Milan, J. C. Coxon, S. Wing, S. Ohtani, and B. J. Anderson (2013). Temporal and spatial dynamics of the regions 1 and 2 Birkeland currents during substorms, Journal of Geophysical Research: Space Physics, 118. doi:10.1002/jgra.50288.

  2. Clausen, L. B. N., S. E. Milan, J. B. H. Baker, J. M. Ruohoniemi, K.-H. Glassmeier, J. C. Coxon, and B. J. Anderson (2013). On the influence of open magnetic flux on substorm intensity: ground- and space-based observations, Journal of Geophysical Research: Space Physics, 118. doi:10.1002/jgra.50308.