Energetic electron injections deep into the inner magnetosphere associated with substorm activity

D. L. Turner; S. G. Claudepierre; J. F. Fennell; T. P. O'Brien; J. B. Blake; C. Lemon; M. Gkioulidou; K. Takahashi; G. D. Reeves; S. Thaller; A. Breneman; J. R. Wygant; W. Li; A. Runov; V. Angelopoulos

doi:10.1002/2015GL063225

Energetic electron injections deep into the inner magnetosphere associated with substorm activity

D. L. Turner, S. G. Claudepierre, J. F. Fennell, T. P. O'Brien, J. B. Blake, C. Lemon, M. Gkioulidou, K. Takahashi, G. D. Reeves, S. Thaller, A. Breneman, J. R. Wygant, W. Li, A. Runov, V. Angelopoulos

Physics and Astronomy (Twin Cities)

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122 Scopus citations

Abstract

From a survey of the first nightside season of NASA's Van Allen Probes mission (December 2012 to September 2013), 47 energetic (tens to hundreds of keV) electron injection events were found at L shells ≤ 4, all of which are deeper than any previously reported substorm-related injections. Preliminary details from these events are presented, including how all occurred shortly after dipolarization signatures and injections were observed at higher L shells, how the deepest observed injection was at L ∼ 2.5, and, surprisingly, how L ≤ 4 injections are limited in energy to ≤250 keV. We present a detailed case study of one example event revealing that the injection of electrons down to L ∼ 3.5 was different from injections observed at higher L and likely resulted from electrons interacting with a fast magnetosonic wave in the Pi2 frequency range inside the plasmasphere. These observations demonstrate that injections occur at very low L shells and may play an important role for inner zone electrons.

Original language	English (US)
Pages (from-to)	2079-2087
Number of pages	9
Journal	Geophysical Research Letters
Volume	42
Issue number	7
DOIs	https://doi.org/10.1002/2015GL063225
State	Published - Apr 16 2015

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©2015. American Geophysical Union. All Rights Reserved.

Keywords

THEMIS
Van Allen Probes
energetic particle injections
inner magnetosphere
radiation belts
substorms

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10.1002/2015GL063225

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Turner, D. L., Claudepierre, S. G., Fennell, J. F., O'Brien, T. P., Blake, J. B., Lemon, C., Gkioulidou, M., Takahashi, K., Reeves, G. D., Thaller, S., Breneman, A., Wygant, J. R., Li, W., Runov, A., & Angelopoulos, V. (2015). Energetic electron injections deep into the inner magnetosphere associated with substorm activity. Geophysical Research Letters, 42(7), 2079-2087. https://doi.org/10.1002/2015GL063225

Turner, DL, Claudepierre, SG, Fennell, JF, O'Brien, TP, Blake, JB, Lemon, C, Gkioulidou, M, Takahashi, K, Reeves, GD, Thaller, S, Breneman, A, Wygant, JR, Li, W, Runov, A & Angelopoulos, V 2015, 'Energetic electron injections deep into the inner magnetosphere associated with substorm activity', Geophysical Research Letters, vol. 42, no. 7, pp. 2079-2087. https://doi.org/10.1002/2015GL063225

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abstract = "From a survey of the first nightside season of NASA's Van Allen Probes mission (December 2012 to September 2013), 47 energetic (tens to hundreds of keV) electron injection events were found at L shells ≤ 4, all of which are deeper than any previously reported substorm-related injections. Preliminary details from these events are presented, including how all occurred shortly after dipolarization signatures and injections were observed at higher L shells, how the deepest observed injection was at L ∼ 2.5, and, surprisingly, how L ≤ 4 injections are limited in energy to ≤250 keV. We present a detailed case study of one example event revealing that the injection of electrons down to L ∼ 3.5 was different from injections observed at higher L and likely resulted from electrons interacting with a fast magnetosonic wave in the Pi2 frequency range inside the plasmasphere. These observations demonstrate that injections occur at very low L shells and may play an important role for inner zone electrons.",

keywords = "THEMIS, Van Allen Probes, energetic particle injections, inner magnetosphere, radiation belts, substorms",

author = "Turner, {D. L.} and Claudepierre, {S. G.} and Fennell, {J. F.} and O'Brien, {T. P.} and Blake, {J. B.} and C. Lemon and M. Gkioulidou and K. Takahashi and Reeves, {G. D.} and S. Thaller and A. Breneman and Wygant, {J. R.} and W. Li and A. Runov and V. Angelopoulos",

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T1 - Energetic electron injections deep into the inner magnetosphere associated with substorm activity

AU - Turner, D. L.

AU - Claudepierre, S. G.

AU - Fennell, J. F.

AU - O'Brien, T. P.

AU - Blake, J. B.

AU - Lemon, C.

AU - Gkioulidou, M.

AU - Takahashi, K.

AU - Reeves, G. D.

AU - Thaller, S.

AU - Breneman, A.

AU - Wygant, J. R.

AU - Li, W.

AU - Runov, A.

AU - Angelopoulos, V.

PY - 2015/4/16

Y1 - 2015/4/16

N2 - From a survey of the first nightside season of NASA's Van Allen Probes mission (December 2012 to September 2013), 47 energetic (tens to hundreds of keV) electron injection events were found at L shells ≤ 4, all of which are deeper than any previously reported substorm-related injections. Preliminary details from these events are presented, including how all occurred shortly after dipolarization signatures and injections were observed at higher L shells, how the deepest observed injection was at L ∼ 2.5, and, surprisingly, how L ≤ 4 injections are limited in energy to ≤250 keV. We present a detailed case study of one example event revealing that the injection of electrons down to L ∼ 3.5 was different from injections observed at higher L and likely resulted from electrons interacting with a fast magnetosonic wave in the Pi2 frequency range inside the plasmasphere. These observations demonstrate that injections occur at very low L shells and may play an important role for inner zone electrons.

AB - From a survey of the first nightside season of NASA's Van Allen Probes mission (December 2012 to September 2013), 47 energetic (tens to hundreds of keV) electron injection events were found at L shells ≤ 4, all of which are deeper than any previously reported substorm-related injections. Preliminary details from these events are presented, including how all occurred shortly after dipolarization signatures and injections were observed at higher L shells, how the deepest observed injection was at L ∼ 2.5, and, surprisingly, how L ≤ 4 injections are limited in energy to ≤250 keV. We present a detailed case study of one example event revealing that the injection of electrons down to L ∼ 3.5 was different from injections observed at higher L and likely resulted from electrons interacting with a fast magnetosonic wave in the Pi2 frequency range inside the plasmasphere. These observations demonstrate that injections occur at very low L shells and may play an important role for inner zone electrons.

KW - THEMIS

KW - Van Allen Probes

KW - energetic particle injections

KW - inner magnetosphere

KW - radiation belts

KW - substorms

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Energetic electron injections deep into the inner magnetosphere associated with substorm activity

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