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The Response of Electron Pitch Angle Distributions to the Upper Limit on Stably Trapped Particles

Research output: Contribution to Journal/Magazine › Journal article › peer-review

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The Response of Electron Pitch Angle Distributions to the Upper Limit on Stably Trapped Particles. / Walton, S. D.; Mann, I. R.; Olifer, L. et al.
In: Journal of Geophysical Research: Space Physics, Vol. 128, No. 11, e2023JA031988, 30.11.2023.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Walton, SD, Mann, IR, Olifer, L, Ozeke, LG, Forsyth, C, Rae, IJ, Walach, MT, Murphy, KR, Claudepierre, SG, Spence, HE & Baker, DN 2023, 'The Response of Electron Pitch Angle Distributions to the Upper Limit on Stably Trapped Particles', Journal of Geophysical Research: Space Physics, vol. 128, no. 11, e2023JA031988. https://doi.org/10.1029/2023ja031988

APA

Walton, S. D., Mann, I. R., Olifer, L., Ozeke, L. G., Forsyth, C., Rae, I. J., Walach, M. T., Murphy, K. R., Claudepierre, S. G., Spence, H. E., & Baker, D. N. (2023). The Response of Electron Pitch Angle Distributions to the Upper Limit on Stably Trapped Particles. Journal of Geophysical Research: Space Physics, 128(11), Article e2023JA031988. https://doi.org/10.1029/2023ja031988

Vancouver

Walton SD, Mann IR, Olifer L, Ozeke LG, Forsyth C, Rae IJ et al. The Response of Electron Pitch Angle Distributions to the Upper Limit on Stably Trapped Particles. Journal of Geophysical Research: Space Physics. 2023 Nov 30;128(11):e2023JA031988. Epub 2023 Nov 10. doi: 10.1029/2023ja031988

Author

Walton, S. D. ; Mann, I. R. ; Olifer, L. et al. / The Response of Electron Pitch Angle Distributions to the Upper Limit on Stably Trapped Particles. In: Journal of Geophysical Research: Space Physics. 2023 ; Vol. 128, No. 11.

Bibtex

@article{d53d80b3e8574cffbc3594b75f104949,
title = "The Response of Electron Pitch Angle Distributions to the Upper Limit on Stably Trapped Particles",
abstract = "We use Van Allen Probes electron data during 70 geomagnetic storms to examine the response of equatorial pitch angle distributions (PADs) at L* = 4.0–4.5 to a theoretical upper limit on stably trapped particle fluxes. Of the energies examined, 54 and 108 keV electron PADs isotropize to a previously assumed level within 6 hr of reaching the limit, near‐identically across all 70 storms, consistent with rapid pitch angle scattering due to chorus wave interactions. In around 30% of events, 54 keV electrons completely exceed the KP limit, before being quickly subdued. 470 and 749 keV PADs show clear indications of an upper limit, though less aligned with the calculated limit used here. The consistency of an absolute upper limit shown across all events demonstrates the importance of this phenomena in both the limiting effect on electron flux and consistently influencing electron PAD evolution during geomagnetic storms. These results also highlight the need for further investigation, particularly related to the limiting of higher energy electrons.",
keywords = "Van Allen Probes, geomagnetic storms, upper limit, pitch angle distribution, outer radiation belt, electrons",
author = "Walton, {S. D.} and Mann, {I. R.} and L. Olifer and Ozeke, {L. G.} and C. Forsyth and Rae, {I. J.} and M.‐T. Walach and Murphy, {K. R.} and Claudepierre, {S. G.} and Spence, {H. E.} and Baker, {D. N.}",
year = "2023",
month = nov,
day = "30",
doi = "10.1029/2023ja031988",
language = "English",
volume = "128",
journal = "Journal of Geophysical Research: Space Physics",
issn = "2169-9402",
publisher = "Blackwell Publishing Ltd",
number = "11",

}

RIS

TY - JOUR

T1 - The Response of Electron Pitch Angle Distributions to the Upper Limit on Stably Trapped Particles

AU - Walton, S. D.

AU - Mann, I. R.

AU - Olifer, L.

AU - Ozeke, L. G.

AU - Forsyth, C.

AU - Rae, I. J.

AU - Walach, M.‐T.

AU - Murphy, K. R.

AU - Claudepierre, S. G.

AU - Spence, H. E.

AU - Baker, D. N.

PY - 2023/11/30

Y1 - 2023/11/30

N2 - We use Van Allen Probes electron data during 70 geomagnetic storms to examine the response of equatorial pitch angle distributions (PADs) at L* = 4.0–4.5 to a theoretical upper limit on stably trapped particle fluxes. Of the energies examined, 54 and 108 keV electron PADs isotropize to a previously assumed level within 6 hr of reaching the limit, near‐identically across all 70 storms, consistent with rapid pitch angle scattering due to chorus wave interactions. In around 30% of events, 54 keV electrons completely exceed the KP limit, before being quickly subdued. 470 and 749 keV PADs show clear indications of an upper limit, though less aligned with the calculated limit used here. The consistency of an absolute upper limit shown across all events demonstrates the importance of this phenomena in both the limiting effect on electron flux and consistently influencing electron PAD evolution during geomagnetic storms. These results also highlight the need for further investigation, particularly related to the limiting of higher energy electrons.

AB - We use Van Allen Probes electron data during 70 geomagnetic storms to examine the response of equatorial pitch angle distributions (PADs) at L* = 4.0–4.5 to a theoretical upper limit on stably trapped particle fluxes. Of the energies examined, 54 and 108 keV electron PADs isotropize to a previously assumed level within 6 hr of reaching the limit, near‐identically across all 70 storms, consistent with rapid pitch angle scattering due to chorus wave interactions. In around 30% of events, 54 keV electrons completely exceed the KP limit, before being quickly subdued. 470 and 749 keV PADs show clear indications of an upper limit, though less aligned with the calculated limit used here. The consistency of an absolute upper limit shown across all events demonstrates the importance of this phenomena in both the limiting effect on electron flux and consistently influencing electron PAD evolution during geomagnetic storms. These results also highlight the need for further investigation, particularly related to the limiting of higher energy electrons.

KW - Van Allen Probes

KW - geomagnetic storms

KW - upper limit

KW - pitch angle distribution

KW - outer radiation belt

KW - electrons

U2 - 10.1029/2023ja031988

DO - 10.1029/2023ja031988

M3 - Journal article

VL - 128

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 2169-9402

IS - 11

M1 - e2023JA031988

ER -