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Solar Energetic Proton Access to the Inner Magnetosphere During the September 7–8, 2017 Event

Journal Article · · Journal of Geophysical Research. Space Physics
DOI:https://doi.org/10.1029/2021ja029107· OSTI ID:1890976
 [1];  [2];  [3];  [4];  [5];  [6];  [7]
  1. Dartmouth College, Hanover, NH (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Dartmouth College, Hanover, NH (United States); National Center for Atmospheric Research (NCAR), Boulder, CO (United States)
  4. Univ. of Colorado, Boulder, CO (United States). Cooperative Inst. for Research in Environmental Sciences (CIRES); National Oceanic and Atmospheric Administration (NOAA), Boulder, CO (United States)
  5. National Center for Atmospheric Research (NCAR), Boulder, CO (United States)
  6. Boston Univ., MA (United States); University Corporation for Atmospheric Research (UCAR), Boulder, CO (United States)
  7. Air Force Research Lab. (AFRL), Kirtland AFB, NM (United States)
+ Show Author Affiliations
Here, the access of solar energetic protons into the inner magnetosphere on September 7–8, 2017 is investigated by following reversed proton trajectories to compute the proton cutoff energy using the Dartmouth geomagnetic cutoff code (Kress et al., 2010, https://doi.org/10.1029/2009sw000488). The cutoff energies for protons coming from the west and east direction, the minimum and maximum cutoff energy respectively, are calculated every 5 min along the orbit of Van Allen Probes using TS07 and the Lyon-Fedder-Mobarry (LFM) MHD magnetic field model. The result shows that the cutoff energy increases significantly as the radial distance decreases, and that the cutoff energy decreases with the building up of the ring current during magnetic storms. Solar wind dynamic pressure also affects cutoff suppression (Kress et al., 2004, https://doi.org/10.1029/2003gl018599). The LFM-RCM model shows stronger suppression of cutoff energy than TS07 during strong solar wind driving conditions. The simulation result is compared with proton flux measurements, showing consistent variation of the cutoff location during the September 7–8, 2017 geomagnetic storm.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA); US Air Force Office of Scientific Research (AFOSR); USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1890976
Report Number(s):
LA-UR-21-20075
Journal Information:
Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 7 Vol. 126; ISSN 2169-9380
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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79 ASTRONOMY AND ASTROPHYSICS
Heliospheric and Magnetospheric Physics