Skip navigation

Dr. Gareth Chisham - Profile

Boakes, P.D., Milan, S.E., Abel, G.A., Freeman, M.P., Chisham, G., and Hubert, B., A superposed epoch investigation of the relation between magnetospheric solar wind driving and substorm dynamics with geosynchronous particle injection signatures. J. Geophys. Res., 116, A01214, doi:10.1029/2010JA016007, 2011.

Longden, N., Chisham, G., Freeman, M.P., Abel, G.A., and Sotirelis, T., Estimating the location of the open-closed magnetic field line boundary from auroral images. Ann. Geophys., 28, 1659-1678, 2010.

Chisham, G., and Freeman, M.P., On the non-Gaussian nature of ionospheric vorticity. Geophys. Res. Lett., 37, L12103, doi:10.1029/2010GL043714, 2010.

Abel, G.A., Freeman, M.P., and Chisham, G., IMF clock angle control of multifractality in ionospheric velocity fluctuations. Geophys. Res. Lett., 36, L19102, doi:10.1029/2009GL040336, 2009.

Chisham, G., Freeman, M.P., Abel, G.A., Bristow, W.A., Marchaudon, A., Ruohoniemi, J.M., and Sofko, G.J., Spatial distribution of average vorticity in the high-latitude ionosphere and its variation with interplanetary magnetic field direction and season. J. Geophys. Res., 114, A09301, doi:10.1029/2009JA014263, 2009.

Boakes, P.D., Milan, S.E., Abel, G.A., Freeman, M.P., Chisham, G., and Hubert, B., A statistical study of the open magnetic flux content of the magnetosphere at the time of substorm onset. Geophys. Res. Lett., 36, L04105, doi:10.1029/2008GL037059, 2009.

Boakes, P.D., Milan, S.E., Abel, G.A., Freeman, M.P., Chisham, G., Hubert, B., and Sotirelis,T., On the use of IMAGE FUV for estimating the latitude of the open/closed magnetic field line boundary in the ionosphere. Ann. Geophys., 26, 2759-2769, 2008.

Yeoman, T.K., Chisham, G., Baddeley, L.J., Dhillon, R.S., Karhunen, T.J.T., Robinson, T.R., Senior, A., and Wright, D.M., Mapping ionospheric backscatter measured by the SuperDARN HF radars, 2: Assessing SuperDARN virtual height models. Ann. Geophys., 26, 843-852, 2008.

Chisham, G., Yeoman, T.K., and Sofko, G.J., Mapping ionospheric backscatter measured by the SuperDARN HF radars, 1: A new empirical virtual height model. Ann. Geophys., 26, 823-841, 2008.

Chisham, G., Freeman, M.P., Abel, G.A., Lam, M.M., Pinnock, M., Coleman, I.J., Milan, S.E., Lester, M., Bristow, W.A., Greenwald, R.A., Sofko, G.J., and Villain, J.-P., Remote sensing of the spatial and temporal structure of magnetopause and magnetotail reconnection from the ionosphere. Rev. Geophys., 46, RG1004, doi:10.1029/2007RG000223, 2008.

Abel, G.A., Freeman, M.P., Chisham, G., and Watkins, N.W., Investigating turbulent structure of ionospheric plasma velocity using the Halley SuperDARN radar. Nonlin. Processes Geophys., 14, 799-809, 2007.

Chisham, G., Lester, M., Milan, S.E., Freeman, M.P., Bristow, W.A., Grocott, A., McWilliams, K.A., Ruohoniemi, J.M., Yeoman, T.K., Dyson, P.L., Greenwald, R.A., Kikuchi, T., Pinnock, M., Rash, J.P.S., Sato, N., Sofko, G.J., Villain, J.-P., and Walker, A.D.M., A decade of the Super Dual Auroral Radar Network (SuperDARN): Scientific achievements, new techniques and future directions. Surv. Geophys., 28, 33-109, 2007.

Freeman, M.P., Chisham, G., and Coleman, I.J., Remote sensing of reconnection, in Reconnection of Magnetic Fields, Eds. J. Birn and E. Priest, Cambridge University Press, pp.217-228, 2007.

Abel, G.A., Freeman, M.P., and Chisham, G., Spatial structure of ionospheric convection velocities in regions of open and closed magnetic field topology. Geophys. Res. Lett., 33, L24103, doi:10.1029/2006GL027919, 2006.

Chisham, G., Freeman, M.P., Lam, M.M., Abel, G.A., Sotirelis, T., Greenwald, R.A., and Lester, M., A statistical comparison of SuperDARN spectral width boundaries and DMSP particle precipitation boundaries in the afternoon sector ionosphere. Ann. Geophys., 23, 3645-3654, 2005.

Abel, G.A., Freeman, M.P. and Chisham, G., Comment on “Location of the reconnection line for northward interplanetary magnetic field” by K.J. Trattner, S.A. Fuselier, and S.M. Petrinec. J. Geophys. Res., 110, A10208, doi:10.1029/2004JA010973, 2005.

Chisham, G., Freeman, M.P., Sotirelis, T., and Greenwald, R.A., The accuracy of using the spectral width boundary measured in off-meridional SuperDARN HF radar beams as a proxy for the open-closed field line boundary. Ann. Geophys., 23, 2599-2604, 2005.

Chisham, G., New proxy for reconnection. Astronomy and Geophysics, 46, 4.23, 2005.

Chisham, G., Freeman, M.P., Sotirelis, T., Greenwald, R.A., Lester, M., and Villain, J.-P., A statistical comparison of SuperDARN spectral width boundaries and DMSP particle precipitation boundaries in the morning sector ionosphere. Ann. Geophys., 23, 733-743, 2005.

Chisham, G., Freeman, M.P., Coleman, I.J., Pinnock, M., Hairston, M.R., Lester, M., and Sofko, G., Measuring the dayside reconnection rate during an interval of due northward interplanetary magnetic field. Ann. Geophys., 22, 4243-4258, 2004.

Parkinson, M.L., Chisham, G., Pinnock, M., Dyson, P.L., and Devlin, J.C., Magnetic local time, substorm, and particle precipitation-related variations in the behaviour of SuperDARN Doppler spectral widths. Ann. Geophys., 22, 4103-4122, 2004.

Freeman, M.P. and Chisham, G., On the probability distributions of SuperDARN Doppler spectral width measurements inside and outside the cusp. Geophys. Res. Lett., 31, L22802, doi:10.1029/2004GL020923, 2004.

Chisham, G., Abel, G.A., and Milan, S.E., Whose field line is it anyway? Astronomy and Geophysics, 45,36-38, 2004.

Chisham, G. and Freeman, M.P., An investigation of latitudinal transitions in the SuperDARN Doppler spectral width parameter at different magnetic local times. Ann. Geophys., 22, 1187-1202, 2004.

Chisham, G., Freeman, M.P., and Sotirelis, T., A statistical comparison of SuperDARN spectral width boundaries and DMSP particle precipitation boundaries in the nightside ionosphere. Geophys. Res. Lett., 31, L02804, doi:10.1029/2003GL019074, 2004.

Pinnock, M., Chisham, G., Coleman, I.J, Freeman, M.P., Hairston, M.R., and Villain, J.-P., The location and rate of dayside reconnection during an interval of southward interplanetary magnetic field. Ann. Geophys., 21, 1467-1482, 2003.

Coleman, I.J, Chisham, G., Pinnock, M., and Freeman, M.P., Reply to comment by S.M. Petrinec and S.A. Fuselier on “An ionospheric convection signature of antiparallel reconnection”. J. Geophys. Res., 108, 1178, doi:10.1029/2002JA009568, 2003.

Chisham, G., and Freeman, M.P., A technique for accurately determining the cusp-region polar cap boundary using SuperDARN HF radar measurements. Ann. Geophys., 21, 983-996, 2003.

Rodger, A.S., Chisham, G., Coleman, I.J., Freeman, M.P., and Pinnock, M., Anti-parallel reconnection at the dayside magnetopause: Ionospheric signatures and implications for the low latitude boundary layer. Earth’s Low-Latitude Boundary Layer,  Geophys. Monograph 133,  AGU, 2003.

Chisham, G., Coleman, I.J., Freeman, M.P., Pinnock, M., and Lester, M., Ionospheric signatures of split reconnection X-lines during conditions of IMF Bz<0 and |By|~|Bz|: Evidence for the anti-parallel merging hypothesis. J. Geophys. Res., 107, 1323, doi:10.1029/2001JA009124, 2002.

Chisham, G., Pinnock, M., Coleman, I.J., Hairston, M.R., and Walker, A.D.M., An unusual geometry of the ionospheric signature of the cusp: Implications for magnetopause merging sites. Ann. Geophys., 20, 29-40, 2002.

Chisham, G. and Pinnock, M., Assessing the contamination of SuperDARN global convection maps by non-F-region backscatter. Ann. Geophys., 20, 13-28, 2002.

Coleman, I.J., Chisham, G., Pinnock, M. and Freeman, M.P., An ionospheric signature of antiparallel reconnection. J. Geophys. Res., 106, 28,995-29,007, 2001.

Chisham, G., Pinnock, M. and Rodger, A.S., The response of the HF radar spectral width boundary to a switch in the IMF By direction: Ionospheric consequences of transient dayside reconnection? J. Geophys. Res., 106, 191-202, 2001.

Chisham, G., Pinnock, M. and Rodger, A.S., Poleward-moving HF radar flow bursts in the cusp: Transient changes in flow speed or direction? Geophys. Res. Lett., 27, 919-922, 2000.

Chisham, G., Pinnock, M., Rodger, A.S. and Villain, J.-P., High-time resolution conjugate SuperDARN radar observations of the dayside convection response to changes in IMF By. Ann. Geophys., 18, 191-201, 2000.

Mann, I.R. and Chisham, G., Comment on "Concerning the generation of geomagnetic giant pulsations by drift-bounce resonance ring current instabilities" by K.-H. Glassmeier et al., Ann. Geophysicae, 17, 338-350, (1999). Ann. Geophys., 18, 161-166, 2000.

Chisham, G., Schwartz, S.J., Burgess, D., Bale, S.D., Dunlop, M.W. and Russell, C.T., Multi-satellite observations of large magnetic depressions in the solar wind. J. Geophys. Res., 105, 2325-2335, 2000.

Chisham, G. and Mann, I.R., A Pc5 ULF wave with large azimuthal wavenumber observed within the morning sector plasmasphere by Sub-Auroral Magnetometer Network. J. Geophys. Res., 104, 14,717-14,727, 1999.

Mann, I.R., Chisham, G. and Wanliss, J.A., Frequency-doubled density perturbations driven by ULF pulsations. J. Geophys. Res., 104, 4559-4565, 1999.

Chisham, G., Schwartz, S.J., Balikhin, M.A. and Dunlop, M.W., AMPTE observations of mirror mode waves in the magnetosheath: Wavevector determination. J. Geophys. Res., 104, 437-447, 1999.

Chisham, G., Burgess, D., Schwartz, S.J. and Dunlop, M.W., Observations of electron distributions in magnetosheath mirror mode waves. J. Geophys. Res., 103, 26,765-26,774. 1998.

Mann, I.R., Chisham, G. and Bale, S.D., Multisatellite and ground-based observations of a tailward propagating Pc5 magnetospheric waveguide mode. J. Geophys. Res., 103, 4657-4669, 1998.

Bale, S.D., Chisham, G., Burgess, D. and Schwartz, S.J., Langmuir wave amplitudes and the electron distribution function near the solar wind-foreshock boundary. Adv. Space Res., 20, (4/5)695-(4/5)698, 1997.

Chisham, G. and Orr, D., A statistical study of the local time asymmetry of Pc5 ULF wave characteristics observed at mid-latitudes by SAMNET. J. Geophys. Res., 102, 24,339-24,350, 1997.

Chisham, G., Bale, S.D., Burgess, D. and Schwartz, S.J., A large magnetic depression observed in the solar wind close to the Earth's bow shock. Adv. Space Res., 19, (6)869-(6)872, 1997.

Chisham, G., Mann, I.R. and Orr, D., A statistical study of giant pulsation latitudinal polarization and amplitude variation. J. Geophys. Res., 102, 9619-9629, 1997.

Chisham, G. Giant pulsations (Pgs): An explanation for their rarity and occurrence during geomagnetically quiet times. J. Geophys. Res., 101, 24,755-24,763, 1996.

Chisham, G., Schwartz, S.J. and Burgess, D., The anisotropy variations of electron distributions in the terrestrial ion foreshock. J. Geophys. Res., 101, 445-455, 1996.

Chisham, G., Orr, D., Yeoman, T.K., Milling, D.K., Lester, M. and Davies, J.A., The polarization of Pc5 ULF waves around dawn: A possible ionospheric conductivity gradient effect. Ann. Geophys., 13, 159-167, 1995.

Chisham, G., Burgess, D. and Schwartz, S.J., Electron distributions in the ion foreshock. Adv. Space Res., 15, (8/9)141-(8/9)145, 1995.

Chisham, G., and Orr, D., The association between giant pulsations (Pgs) and the auroral oval. Ann. Geophys., 12, 649-654, 1994.

Chisham, G., Orr, D. and Yeoman, T.K., Observations of a giant pulsation across an extended array of ground magnetometers and on auroral radar. Planet. Space Sci., 40, 953-964, 1992.

Chisham, G., and Orr, D., Statistical studies of giant pulsations (Pgs): Harmonic mode. Planet. Space Sci., 39, 999-1006, 1991.

Chisham, G., Orr, D., Taylor, M.J. and Luhr, H., The magnetic and optical signature of a Pg pulsation. Planet. Space Sci., 38, 1443-1456, 1990.

Taylor, M.J., Chisham, G. and Orr, D., Pulsating auroral forms and their association with geomagnetic giant pulsations. Planet. Space Sci., 37, 1477-1484, 1989.