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Title: Local time variations of high-energy plasmaspheric ion pitch angle distributions

Abstract

Recent observations from the Van Allen Probes Helium Oxygen Proton Electron (HOPE) instrument revealed a persistent depletion in the 1–10 eV ion population in the postmidnight sector during quiet times in the 2 < L < 3 region. This study explores the source of this ion depletion by developing an algorithm to classify 26 months of pitch angle distributions measured by the HOPE instrument. We correct the HOPE low energy fluxes for spacecraft potential using measurements from the Electric Field and Waves (EFW) instrument. A high percentage of low count pitch angle distributions is found in the postmidnight sector coupled with a low percentage of ion distributions peaked perpendicular to the field line. A peak in loss cone distributions in the dusk sector is also observed. Here, these results characterize the nature of the dearth of the near 90° pitch angle 1–10 eV ion population in the near-Earth postmidnight sector. This study also shows, for the first time, low-energy HOPE differential number fluxes corrected for spacecraft potential and 1–10 eV H+ fluxes at different levels of geomagnetic activity.

Authors:
 [1];  [1];  [2];  [2];  [1];  [3];  [4]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. West Virginia Univ., Morgantown, WV (United States)
  4. Univ. of Minnesota, Minneapolis, MN (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
National Aeronautic and Space Administration (NASA); USDOE
OSTI Identifier:
1291224
Report Number(s):
LA-UR-15-29276
Journal ID: ISSN 2169-9380
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Name: Journal of Geophysical Research. Space Physics; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Heliospheric and Magnetospheric Physics

Citation Formats

Sarno-Smith, Lois K., Liemohn, Michael W., Skoug, Ruth M., Larsen, Brian Arthur, Moldwin, Mark B., Katus, Roxanne M., and Wygant, John R. Local time variations of high-energy plasmaspheric ion pitch angle distributions. United States: N. p., 2016. Web. doi:10.1002/2015JA022301.
Sarno-Smith, Lois K., Liemohn, Michael W., Skoug, Ruth M., Larsen, Brian Arthur, Moldwin, Mark B., Katus, Roxanne M., & Wygant, John R. Local time variations of high-energy plasmaspheric ion pitch angle distributions. United States. doi:10.1002/2015JA022301.
Sarno-Smith, Lois K., Liemohn, Michael W., Skoug, Ruth M., Larsen, Brian Arthur, Moldwin, Mark B., Katus, Roxanne M., and Wygant, John R. Fri . "Local time variations of high-energy plasmaspheric ion pitch angle distributions". United States. doi:10.1002/2015JA022301. https://www.osti.gov/servlets/purl/1291224.
@article{osti_1291224,
title = {Local time variations of high-energy plasmaspheric ion pitch angle distributions},
author = {Sarno-Smith, Lois K. and Liemohn, Michael W. and Skoug, Ruth M. and Larsen, Brian Arthur and Moldwin, Mark B. and Katus, Roxanne M. and Wygant, John R.},
abstractNote = {Recent observations from the Van Allen Probes Helium Oxygen Proton Electron (HOPE) instrument revealed a persistent depletion in the 1–10 eV ion population in the postmidnight sector during quiet times in the 2 < L < 3 region. This study explores the source of this ion depletion by developing an algorithm to classify 26 months of pitch angle distributions measured by the HOPE instrument. We correct the HOPE low energy fluxes for spacecraft potential using measurements from the Electric Field and Waves (EFW) instrument. A high percentage of low count pitch angle distributions is found in the postmidnight sector coupled with a low percentage of ion distributions peaked perpendicular to the field line. A peak in loss cone distributions in the dusk sector is also observed. Here, these results characterize the nature of the dearth of the near 90° pitch angle 1–10 eV ion population in the near-Earth postmidnight sector. This study also shows, for the first time, low-energy HOPE differential number fluxes corrected for spacecraft potential and 1–10 eV H+ fluxes at different levels of geomagnetic activity.},
doi = {10.1002/2015JA022301},
journal = {Journal of Geophysical Research. Space Physics},
number = ,
volume = ,
place = {United States},
year = {2016},
month = {7}
}

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