Details:

Journal Title:
Journal of Geophysical Research: Space Physics
Personal Author:
Qin, Murong ; Hudson, Mary ; Kress, Brian ; Selesnick, Richard ; Engel, Miles ; ... More +
Qin, Murong ; Hudson, Mary ; Kress, Brian ; Selesnick, Richard ; Engel, Miles ; Li, Zhao ; Shen, Xiaochen Less -
NOAA Program & Office:
CIRES (Cooperative Institute for Research in Environmental Sciences)
Description:
In this study, 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. The numerical result is approximately consistent with the observation that the energy of almost all solar protons stays above the minimum cutoff rigidity.
Keywords:
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Magnetosphere Solar Energetic Particles
Source:
Journal of Geophysical Research: Space Physics,;124, 3402-3409;
DOI:
https://doi.org/10.1029/2018JA026380
Document Type:
Journal Article
Rights Information:
Other
Compliance:
Submitted
Main Document Checksum:
[+]
urn:sha256:6e92ec6d25b8d42be9ca5021ec227b78fb9f6eceb42b6ae2b78ad50db4f6845d
Download URL:
https://repository.library.noaa.gov/view/noaa/25184/noaa_25184_DS1.pdf
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