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Modeling the Magnetopause Shadowing Loss During the June 2015 Dropout Event

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/2019gl084419· OSTI ID:1659192
 [1];  [2];  [3]
  1. West Virginia Univ., Morgantown, WV (United States)
  2. West Virginia Univ., Morgantown, WV (United States); Univ. of Colorado, Boulder, CO (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
+ Show Author Affiliations
Fast dropout of relativistic and ultrarelativistic electrons at both high and low L* regions were observed during the intense coronal mass ejection driven storm in June 2015. An improved radial diffusion model, using an event-specific Last Closed Drift Shell (LCDS) and newly-available radial diffusion coefficients (DDLL), is implemented to simulate the magnetopause shadowing loss of electrons. The model captures the fast shadowing loss of electrons well at high L* regions after both interplanetary shocks, and reproduces the initial adiabatic loss of the high-energy storage ring at low L* regions after the second strong shock. In this paper, we show for the first time that using the event-specific and K-dependent LCDS and improved DDLL is critical to reproduce the observed dropout features, including the timing, location, and the butterfly electron pitch angle distribution. Future inclusion of the EMIC wave scattering process is needed to model the observed further depletion of the storage ring.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Aeronautic and Space Administration (NASA); National Science Foundation (NSF); USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1659192
Alternate ID(s):
OSTI ID: 1559103
Report Number(s):
LA-UR--19-26679
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 16 Vol. 46; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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