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- Title
Role of Subauroral Polarization Streams in Deep Injections of Energetic Electrons Into the Inner Magnetosphere.
- Authors
Goyal, R.; Zhao, H.; Califf, S.; Goldstein, J.; Sarris, T. E.
- Abstract
The electric fields of subauroral polarization streams (SAPS) have been suggested to affect energetic charged particles' dynamics in the inner magnetosphere, though their role on radiation belt electrons has never been properly quantified. A moderate geomagnetic storm on 2015‐09‐07 caused the deep injection of 10–100s of keV electrons in Earth's inner magnetosphere to low L* (L* < 4). Using a 2‐D test particle tracer, we present the effects of electric fields given by the Volland‐Stern model, a SAPS (Goldstein et al., 2005, https://doi.org/10.1029/2005ja011135) model, and a modified SAPS model on the energetic electron deep injections. The modified SAPS model reflects the SAPS electric field observations by the Van Allen Probes and is supported by Defense Meteorological Satellite Program observations. Simulations suggest that the SAPS electric field pushes 10–20 MeV/G electrons Earthward to L* ∼ 2.7 in 2.5 hr, much deeper compared to the Volland‐Stern electric field. Plain Language Summary: The study of energetic charged particle dynamics in Earth's inner magnetosphere is important as these charged particles pose a danger to the human technology systems (satellites, etc.) traversing through the region. The moderate to intense geomagnetic storms cause added complexity by transporting these charged particles into and out of the inner magnetospheric region. To understand this complexity, a study is conducted using Van Allen Probes observations for a moderate storm on 2015‐09‐07 which pushed 10–100 s of keV electrons deep into Earth's inner magnetosphere. It is suggested that the electric fields generated due to subauroral polarization streams (SAPS) are one of the major causes behind such deep injections, and that SAPS cause lower energy electrons to penetrate deeper into the inner magnetosphere than higher energy electrons. Key Points: A moderate storm on 2015‐09‐07 injected energetic charged particles into Earth's lower L* (≤4)The electric fields generated by subauroral polarization streams (SAPS) are a potential cause behind these deep injectionsThe quantitative fitting of the SAPS model to Van Allen Probes observations highly affects the simulated lower energy electron fluxes
- Subjects
MAGNETOSPHERE; ELECTRONS; ELECTRIC field effects; METEOROLOGICAL satellites; ELECTRIC fields
- Publication
Geophysical Research Letters, 2024, Vol 51, Issue 11, p1
- ISSN
0094-8276
- Publication type
Article
- DOI
10.1029/2024GL108863