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Overlapping ion populations in the cusp: Polar/TIMAS results

Trattner, KJ; Coates, AJ; Fazakerley, AN; Johnstone, AD; Balsiger, H; Burch, JL; Fuselier, SA; ... Shelley, EG; + view all (1998) Overlapping ion populations in the cusp: Polar/TIMAS results. Geophysical Research Letters , 25 (10) 1621 - 1624. 10.1029/98GL01060. Green open access

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Abstract

The 90 degree inclined orbit of the Polar satellite crosses the cusp at intermediate altitudes (4R(E)-6R(E)). The Toroidal Imaging Mass-Angle Spectrograph (TIMAS) on the Polar spacecraft can obtain full energy/pitch angle distributions for four masses simultaneously. Many examples of magnetosheath particle injections with velocity dispersion, sometimes overlapping, have been observed.We report on two crossings of the cusp where TIMAS observed several overlapping cusp ion injections. These injections showed simultaneous onset of cusp ion precipitation at two different energies as well as the brief occurrence of ion precipitation above and below the energy of a preexisting population. Existing models of cusp precipitation do not provide an adequate explanation of these observations.

Type: Article
Title: Overlapping ion populations in the cusp: Polar/TIMAS results
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/98GL01060
Publisher version: http://dx.doi.org/10.1029/98GL01060
Language: English
Additional information: Copyright 1998 by the American Geophysical Union
Keywords: Magnetosheath plasma, Polar cusp, Magnetopause reconnection, Dayside magnetopause, Magnetic-field, Injection, Precipitation, Mantle
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/158573
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