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Title: The Global Statistical Response of the Outer Radiation Belt During Geomagnetic Storms

Using the total radiation belt electron content calculated from Van Allen Probe phase space density, the time-dependent and global response of the outer radiation belt during storms is statistically studied. Using phase space density reduces the impacts of adiabatic changes in the main phase, allowing a separation of adiabatic and nonadiabatic effects and revealing a clear modality and repeatable sequence of events in storm time radiation belt electron dynamics. This sequence exhibits an important first adiabatic invariant (μ)-dependent behavior in the seed (150 MeV/G), relativistic (1,000 MeV/G), and ultrarelativistic (4,000 MeV/G) populations. The outer radiation belt statistically shows an initial phase dominated by loss followed by a second phase of rapid acceleration, while the seed population shows little loss and immediate enhancement. Lastly, the time sequence of the transition to the acceleration is also strongly μ dependent and occurs at low μ first, appearing to be repeatable from storm to storm.
Authors:
ORCiD logo [1] ; ORCiD logo [2] ; ORCiD logo [3] ; ORCiD logo [4] ; ORCiD logo [5] ; ORCiD logo [6] ; ORCiD logo [4] ; ORCiD logo [7] ; ORCiD logo [7] ; ORCiD logo [8] ; ORCiD logo [9] ; ORCiD logo [10] ; ORCiD logo [7] ; ORCiD logo [7]
  1. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland, College Park, MD (United States). Dept. of Astronomy
  2. Univ. of Reading, Reading (United Kingdom). Dept. of Meteorology
  3. Univ. of Alberta, Edmonton, AB (Canada). Dept. of Physics
  4. Univ. College London (UCL), Surrey (United Kingdom). Mullard Space Science Lab. (MSSL), Dept. of Space and Climate Physics
  5. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  6. New Mexico Consortium, Los Alamos, NM (United States)
  7. Aerospace Corporation, El Segundo, CA (United States). Space Sciences Dept.
  8. Univ. of Colorado, Boulder, CO (United States). Lab. for Atmospheric and Space Physics
  9. Univ. of New Hampshire, Durham, NH (United States). Inst. for the Study of Earth, Oceans, and Space
  10. New Mexico Consortium, Los Alamos, NM (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-18-25088
Journal ID: ISSN 0094-8276
Grant/Contract Number:
AC52-06NA25396; ST/M000885/1; NE/P017274/1; ST/N000722/1; NE/L007495/1; NE/P017150/1; NE/P017185/1; NAS5-01072; NNX10AK93G
Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 45; Journal Issue: 9; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE; National Aeronautic and Space Administration (NASA)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Heliospheric and Magnetospheric Physics; geomagnetic storms; radiation belts; Van Allen probes; statistical analysis; solar wind‐magnetosphere coupling; magnetospheric dynamics
OSTI Identifier:
1463566

Murphy, K. R., Watt, C. E. J., Mann, I. R., Jonathan Rae, I., Sibeck, D. G., Boyd, A. J., Forsyth, C. F., Turner, D. L., Claudepierre, S. G., Baker, D. N., Spence, H. E., Reeves, Geoffrey D., Blake, J. B., and Fennell, J.. The Global Statistical Response of the Outer Radiation Belt During Geomagnetic Storms. United States: N. p., Web. doi:10.1002/2017GL076674.
Murphy, K. R., Watt, C. E. J., Mann, I. R., Jonathan Rae, I., Sibeck, D. G., Boyd, A. J., Forsyth, C. F., Turner, D. L., Claudepierre, S. G., Baker, D. N., Spence, H. E., Reeves, Geoffrey D., Blake, J. B., & Fennell, J.. The Global Statistical Response of the Outer Radiation Belt During Geomagnetic Storms. United States. doi:10.1002/2017GL076674.
Murphy, K. R., Watt, C. E. J., Mann, I. R., Jonathan Rae, I., Sibeck, D. G., Boyd, A. J., Forsyth, C. F., Turner, D. L., Claudepierre, S. G., Baker, D. N., Spence, H. E., Reeves, Geoffrey D., Blake, J. B., and Fennell, J.. 2018. "The Global Statistical Response of the Outer Radiation Belt During Geomagnetic Storms". United States. doi:10.1002/2017GL076674. https://www.osti.gov/servlets/purl/1463566.
@article{osti_1463566,
title = {The Global Statistical Response of the Outer Radiation Belt During Geomagnetic Storms},
author = {Murphy, K. R. and Watt, C. E. J. and Mann, I. R. and Jonathan Rae, I. and Sibeck, D. G. and Boyd, A. J. and Forsyth, C. F. and Turner, D. L. and Claudepierre, S. G. and Baker, D. N. and Spence, H. E. and Reeves, Geoffrey D. and Blake, J. B. and Fennell, J.},
abstractNote = {Using the total radiation belt electron content calculated from Van Allen Probe phase space density, the time-dependent and global response of the outer radiation belt during storms is statistically studied. Using phase space density reduces the impacts of adiabatic changes in the main phase, allowing a separation of adiabatic and nonadiabatic effects and revealing a clear modality and repeatable sequence of events in storm time radiation belt electron dynamics. This sequence exhibits an important first adiabatic invariant (μ)-dependent behavior in the seed (150 MeV/G), relativistic (1,000 MeV/G), and ultrarelativistic (4,000 MeV/G) populations. The outer radiation belt statistically shows an initial phase dominated by loss followed by a second phase of rapid acceleration, while the seed population shows little loss and immediate enhancement. Lastly, the time sequence of the transition to the acceleration is also strongly μ dependent and occurs at low μ first, appearing to be repeatable from storm to storm.},
doi = {10.1002/2017GL076674},
journal = {Geophysical Research Letters},
number = 9,
volume = 45,
place = {United States},
year = {2018},
month = {5}
}