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Title: O + ion conic and plasma sheet dynamics observed by Van Allen Probe satellites during the 1 June 2013 magnetic storm: Energetic Inner Magnetosphere O + Ions

Abstract

The Van Allen Probe satellites were near apogee in the late evening local time sector during the 1 June 2013 magnetic storm's main phase. About an hour after crossing the ring current's “nose structure” into the plasma sheet, the satellites encountered a quasiperiodic sequence of 0.08–3 keV O+ ions. Pitch angle distributions of this population consistently peaked nearly antiparallel to the local magnetic field. We then interpret this population as O+ conics originating in the northern ionosphere. The sequences began as fairly steady state conic fluxes with energies in the ~ 80 to 100 eV range. Over about a half hour buildup phase, O+ energies peaked near 1 keV. During subsequent release phases lasting ~ 20 min, O+ energies returned to low-energy starting points. We argue these observations reflect repeated formations and dissolutions of downward, magnetically aligned electric fields (ε||) layers trapping O+ conics between mirror points within heating layers below and electrostatic barriers above. Nearly identical variations were observed at the locations of both satellites during 9 of these 13 conic cycles. Phase differences between cycles were observed at both spacecraft during the remaining events. Most “buildup” to “release” phase transitions coincided with AL index minima. But, in situmore » magnetometer measurements indicate only weak dipolarizations of tail-like magnetic fields. The lack of field-aligned reflected O+ and tail-like magnetic fields suggest that both ionospheres may be active. However, Southern Hemisphere origin conics cannot be observed since they would be isotropized and accelerated during neutral sheet crossings.« less

Authors:
 [1];  [2];  [3];  [2];  [4]; ORCiD logo [5];  [6]
+ Show Author Affiliations
  1. Boston College, Chestnut Hill, MA (United States). Inst. for Scienctific Research
  2. MIT Haystack Observatory, Westford, MA (United States)
  3. Univ. of Massachusetts, Lowell, MA (United States). Center for Atmospheric Research
  4. Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Physics and Astronomy
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. Univ. of Iowa, Iowa City, IA (United States). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE; National Aeronautics and Space Administration (NASA)
OSTI Identifier:
1402592
Report Number(s):
LA-UR-15-27238
Journal ID: ISSN 2169-9380; TRN: US1702997
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 121; Journal Issue: 5; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Heliospheric and Magnetospheric Physics

Citation Formats

Burke, W. J., Erickson, P. J., Yang, J., Foster, J., Wygant, J., Reeves, G., and Kletzing, C. O + ion conic and plasma sheet dynamics observed by Van Allen Probe satellites during the 1 June 2013 magnetic storm: Energetic Inner Magnetosphere O + Ions. United States: N. p., 2016. Web. doi:10.1002/2015JA021795.
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Burke, W. J., Erickson, P. J., Yang, J., Foster, J., Wygant, J., Reeves, G., & Kletzing, C. O + ion conic and plasma sheet dynamics observed by Van Allen Probe satellites during the 1 June 2013 magnetic storm: Energetic Inner Magnetosphere O + Ions. United States. https://doi.org/10.1002/2015JA021795
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Burke, W. J., Erickson, P. J., Yang, J., Foster, J., Wygant, J., Reeves, G., and Kletzing, C. Sat . "O + ion conic and plasma sheet dynamics observed by Van Allen Probe satellites during the 1 June 2013 magnetic storm: Energetic Inner Magnetosphere O + Ions". United States. https://doi.org/10.1002/2015JA021795. https://www.osti.gov/servlets/purl/1402592.
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@article{osti_1402592,
title = {O + ion conic and plasma sheet dynamics observed by Van Allen Probe satellites during the 1 June 2013 magnetic storm: Energetic Inner Magnetosphere O + Ions},
author = {Burke, W. J. and Erickson, P. J. and Yang, J. and Foster, J. and Wygant, J. and Reeves, G. and Kletzing, C.},
abstractNote = {The Van Allen Probe satellites were near apogee in the late evening local time sector during the 1 June 2013 magnetic storm's main phase. About an hour after crossing the ring current's “nose structure” into the plasma sheet, the satellites encountered a quasiperiodic sequence of 0.08–3 keV O+ ions. Pitch angle distributions of this population consistently peaked nearly antiparallel to the local magnetic field. We then interpret this population as O+ conics originating in the northern ionosphere. The sequences began as fairly steady state conic fluxes with energies in the ~ 80 to 100 eV range. Over about a half hour buildup phase, O+ energies peaked near 1 keV. During subsequent release phases lasting ~ 20 min, O+ energies returned to low-energy starting points. We argue these observations reflect repeated formations and dissolutions of downward, magnetically aligned electric fields (ε||) layers trapping O+ conics between mirror points within heating layers below and electrostatic barriers above. Nearly identical variations were observed at the locations of both satellites during 9 of these 13 conic cycles. Phase differences between cycles were observed at both spacecraft during the remaining events. Most “buildup” to “release” phase transitions coincided with AL index minima. But, in situ magnetometer measurements indicate only weak dipolarizations of tail-like magnetic fields. The lack of field-aligned reflected O+ and tail-like magnetic fields suggest that both ionospheres may be active. However, Southern Hemisphere origin conics cannot be observed since they would be isotropized and accelerated during neutral sheet crossings.},
doi = {10.1002/2015JA021795},
journal = {Journal of Geophysical Research. Space Physics},
number = 5,
volume = 121,
place = {United States},
year = {Sat May 07 00:00:00 EDT 2016},
month = {Sat May 07 00:00:00 EDT 2016}
}
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