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Title: Investigation of Solar Proton Access Into the Inner Magnetosphere on 11 September 2017

Abstract

Here, access of solar energetic protons to the inner magnetosphere on 11 September 2017 is investigated by computing the reverse particle trajectories with the Dartmouth geomagnetic cutoff code (Kress et al., 2010). The maximum and minimum cutoff rigidity at each point along the orbit of Van Allen Probe A is numerically computed by extending the code to calculate cutoff rigidity for particles coming from arbitrary direction. Pulse height analyzed (PHA) data have the advantage of providing individual particle energies and effectively excluding background high-energy proton contamination. This technique is adopted to study the cutoff locations for solar protons with different energy. The results demonstrate that cutoff latitude is lower for solar protons with higher energy, consistent with low-altitude vertical cutoffs. Both the observations and numerical results show that proton access into the inner magnetosphere depends strongly on angle between particle arrival direction and magnetic west. Finally, the numerical result is approximately consistent with the observation that the energy of almost all solar protons stays above the minimum cutoff rigidity.

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [1]; ORCiD logo [6]
  1. Dartmouth College, Hanover, NH (United States)
  2. Dartmouth College, Hanover, NH (United States); National Center for Atmospheric Research, Boulder, CO (United States)
  3. Univ. of Colorado, Boulder, CO (United States)
  4. Air Force Research Laboratory, Kirtland AFB, NM (United States)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. Boston Univ., MA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE; National Science Foundation (NSF)
OSTI Identifier:
1529543
Report Number(s):
LA-UR-18-31475
Journal ID: ISSN 2169-9380
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 145; Journal Issue: 5; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 79 ASTRONOMY AND ASTROPHYSICS; solar proton; cutoff energy; cutoff location; pulse height analyzed data; Dartmouth geomagnetic cutoff code; straggling function

Citation Formats

Qin, Murong, Hudson, Mary, Kress, Brian, Selesnick, Richard, Engel, Miles, Li, Zhao, and Shen, Xiaochen. Investigation of Solar Proton Access Into the Inner Magnetosphere on 11 September 2017. United States: N. p., 2019. Web. doi:10.1029/2018JA026380.
Qin, Murong, Hudson, Mary, Kress, Brian, Selesnick, Richard, Engel, Miles, Li, Zhao, & Shen, Xiaochen. Investigation of Solar Proton Access Into the Inner Magnetosphere on 11 September 2017. United States. doi:10.1029/2018JA026380.
Qin, Murong, Hudson, Mary, Kress, Brian, Selesnick, Richard, Engel, Miles, Li, Zhao, and Shen, Xiaochen. Tue . "Investigation of Solar Proton Access Into the Inner Magnetosphere on 11 September 2017". United States. doi:10.1029/2018JA026380. https://www.osti.gov/servlets/purl/1529543.
@article{osti_1529543,
title = {Investigation of Solar Proton Access Into the Inner Magnetosphere on 11 September 2017},
author = {Qin, Murong and Hudson, Mary and Kress, Brian and Selesnick, Richard and Engel, Miles and Li, Zhao and Shen, Xiaochen},
abstractNote = {Here, access of solar energetic protons to the inner magnetosphere on 11 September 2017 is investigated by computing the reverse particle trajectories with the Dartmouth geomagnetic cutoff code (Kress et al., 2010). The maximum and minimum cutoff rigidity at each point along the orbit of Van Allen Probe A is numerically computed by extending the code to calculate cutoff rigidity for particles coming from arbitrary direction. Pulse height analyzed (PHA) data have the advantage of providing individual particle energies and effectively excluding background high-energy proton contamination. This technique is adopted to study the cutoff locations for solar protons with different energy. The results demonstrate that cutoff latitude is lower for solar protons with higher energy, consistent with low-altitude vertical cutoffs. Both the observations and numerical results show that proton access into the inner magnetosphere depends strongly on angle between particle arrival direction and magnetic west. Finally, the numerical result is approximately consistent with the observation that the energy of almost all solar protons stays above the minimum cutoff rigidity.},
doi = {10.1029/2018JA026380},
journal = {Journal of Geophysical Research. Space Physics},
number = 5,
volume = 145,
place = {United States},
year = {2019},
month = {4}
}

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