Self-consistent modeling of electron precipitation and responses in the ionosphere: application to low-altitude energization during substorms
Abstract
Abstract We report a new modeling capability that self‐consistently couples physics‐based magnetospheric electron precipitation with its impact on the ionosphere. Specifically, the ring current model RAM‐SCBE is two‐way coupled to an ionospheric electron transport model GLOW (GLobal airglOW), representing a significant improvement over previous models, in which the ionosphere is either treated as a 2‐D spherical boundary of the magnetosphere or is driven by empirical precipitation models that are incapable of capturing small‐scale, transient variations. The new model enables us to study the impact of substorm‐associated, spectrum‐resolved electron precipitation on the 3‐D ionosphere. We found that after each substorm injection, a high‐energy tail of precipitation is produced in the dawn sector outside the plasmapause, by energetic electrons (10 < E < 100 keV) scattered by whistler‐mode chorus waves. Consequently, an ionospheric sublayer characterized by enhanced Pedersen conductivity arises at unusually low altitude (∼85 km), with its latitudinal width of ∼5–10° in the auroral zone. The sublayer structure appears intermittently, in correlation with recurrent substorm injections. It propagates eastward from the nightside to the dayside in the same drift direction of source electrons injected from the plasma sheet, resulting in global impact within the ionosphere. This study demonstrates the model's capability of revealingmore »
- Authors:
-
[1];
[2];
[3];
[4]
- Beihang Univ., Beijing (China)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. Corp. for Atmospheric Research, Boulder, CO (United States); California Inst. of Technology (CalTech), Pasadena, CA (United States)
- National Center for Atmospheric Research, Boulder, CO (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Laboratory Directed Research and Development (LDRD) Program
- OSTI Identifier:
- 1458960
- Alternate Identifier(s):
- OSTI ID: 1460037
- Report Number(s):
- LA-UR-18-21528
Journal ID: ISSN 0094-8276
- Grant/Contract Number:
- AC52-06NA25396; DEAC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Geophysical Research Letters
- Additional Journal Information:
- Journal Volume: 45; Journal Issue: 13; Journal ID: ISSN 0094-8276
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Heliospheric and Magnetospheric Physics
Citation Formats
Yu, Yiqun, Jordanova, Vania Koleva, McGranaghan, Ryan M., and Solomon, Stanley C. Self-consistent modeling of electron precipitation and responses in the ionosphere: application to low-altitude energization during substorms. United States: N. p., 2018.
Web. doi:10.1029/2018GL078828.
Yu, Yiqun, Jordanova, Vania Koleva, McGranaghan, Ryan M., & Solomon, Stanley C. Self-consistent modeling of electron precipitation and responses in the ionosphere: application to low-altitude energization during substorms. United States. https://doi.org/10.1029/2018GL078828
Yu, Yiqun, Jordanova, Vania Koleva, McGranaghan, Ryan M., and Solomon, Stanley C. Mon .
"Self-consistent modeling of electron precipitation and responses in the ionosphere: application to low-altitude energization during substorms". United States. https://doi.org/10.1029/2018GL078828. https://www.osti.gov/servlets/purl/1458960.
@article{osti_1458960,
title = {Self-consistent modeling of electron precipitation and responses in the ionosphere: application to low-altitude energization during substorms},
author = {Yu, Yiqun and Jordanova, Vania Koleva and McGranaghan, Ryan M. and Solomon, Stanley C.},
abstractNote = {Abstract We report a new modeling capability that self‐consistently couples physics‐based magnetospheric electron precipitation with its impact on the ionosphere. Specifically, the ring current model RAM‐SCBE is two‐way coupled to an ionospheric electron transport model GLOW (GLobal airglOW), representing a significant improvement over previous models, in which the ionosphere is either treated as a 2‐D spherical boundary of the magnetosphere or is driven by empirical precipitation models that are incapable of capturing small‐scale, transient variations. The new model enables us to study the impact of substorm‐associated, spectrum‐resolved electron precipitation on the 3‐D ionosphere. We found that after each substorm injection, a high‐energy tail of precipitation is produced in the dawn sector outside the plasmapause, by energetic electrons (10 < E < 100 keV) scattered by whistler‐mode chorus waves. Consequently, an ionospheric sublayer characterized by enhanced Pedersen conductivity arises at unusually low altitude (∼85 km), with its latitudinal width of ∼5–10° in the auroral zone. The sublayer structure appears intermittently, in correlation with recurrent substorm injections. It propagates eastward from the nightside to the dayside in the same drift direction of source electrons injected from the plasma sheet, resulting in global impact within the ionosphere. This study demonstrates the model's capability of revealing complex cross‐scale interactions in the geospace environment.},
doi = {10.1029/2018GL078828},
journal = {Geophysical Research Letters},
number = 13,
volume = 45,
place = {United States},
year = {Mon Jun 25 00:00:00 EDT 2018},
month = {Mon Jun 25 00:00:00 EDT 2018}
}
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Works referencing / citing this record:
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