Electron Energization Signatures in Traveling Kinetic Alfvén Waves at Storm Time Injection Fronts
Abstract The properties of traveling kinetic Alfvén waves (KAWs) and their role in energizing electrons in the inner magnetosphere during a geomagnetic storm are examined using measurements from the Van Allen Probes and Gyrofluid‐Kinetic Electron (GKE) model simulations. Traveling KAWs occur in the...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2022-08-01
|
| Series: | Geophysical Research Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2022GL099318 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849725983475630080 |
|---|---|
| author | A. J. Hull P. A. Damiano C. C. Chaston J. R. Johnson G. D. Reeves |
| author_facet | A. J. Hull P. A. Damiano C. C. Chaston J. R. Johnson G. D. Reeves |
| author_sort | A. J. Hull |
| collection | DOAJ |
| description | Abstract The properties of traveling kinetic Alfvén waves (KAWs) and their role in energizing electrons in the inner magnetosphere during a geomagnetic storm are examined using measurements from the Van Allen Probes and Gyrofluid‐Kinetic Electron (GKE) model simulations. Traveling KAWs occur in the vicinity of energetic plasma injection fronts in association with magnetic field dipolarizations. The KAWs coincide with energized field‐aligned electrons at energies ≲1 keV. By using observational constraints and incorporating hot and cold electron populations, the GKE simulations are able to reproduce the observed energized electron distribution signatures. The modeling results demonstrate the crucial importance of cold electrons for best observational agreement. The results show that the electron response to KAWs can be substantially different for opposing current regions and are a sensitive function of the cold electron relative density. |
| format | Article |
| id | doaj-art-72c91c907b3c45058fc659a219143bc9 |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2022-08-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-72c91c907b3c45058fc659a219143bc92025-08-20T03:10:20ZengWileyGeophysical Research Letters0094-82761944-80072022-08-014915n/an/a10.1029/2022GL099318Electron Energization Signatures in Traveling Kinetic Alfvén Waves at Storm Time Injection FrontsA. J. Hull0P. A. Damiano1C. C. Chaston2J. R. Johnson3G. D. Reeves4Space Sciences Laboratory University of California Berkeley CA USAGeophysical Institute University of Alaska Fairbanks Fairbanks AK USASpace Sciences Laboratory University of California Berkeley CA USADepartment of Engineering Andrews University Berrien Springs MI USALos Alamos National Laboratory Los Alamos NM USAAbstract The properties of traveling kinetic Alfvén waves (KAWs) and their role in energizing electrons in the inner magnetosphere during a geomagnetic storm are examined using measurements from the Van Allen Probes and Gyrofluid‐Kinetic Electron (GKE) model simulations. Traveling KAWs occur in the vicinity of energetic plasma injection fronts in association with magnetic field dipolarizations. The KAWs coincide with energized field‐aligned electrons at energies ≲1 keV. By using observational constraints and incorporating hot and cold electron populations, the GKE simulations are able to reproduce the observed energized electron distribution signatures. The modeling results demonstrate the crucial importance of cold electrons for best observational agreement. The results show that the electron response to KAWs can be substantially different for opposing current regions and are a sensitive function of the cold electron relative density.https://doi.org/10.1029/2022GL099318dispersive Alfven wavesfield aligned electronsinner magnetospherekinetic Alfvén wavesgeomagnetic stormssubstorms |
| spellingShingle | A. J. Hull P. A. Damiano C. C. Chaston J. R. Johnson G. D. Reeves Electron Energization Signatures in Traveling Kinetic Alfvén Waves at Storm Time Injection Fronts Geophysical Research Letters dispersive Alfven waves field aligned electrons inner magnetosphere kinetic Alfvén waves geomagnetic storms substorms |
| title | Electron Energization Signatures in Traveling Kinetic Alfvén Waves at Storm Time Injection Fronts |
| title_full | Electron Energization Signatures in Traveling Kinetic Alfvén Waves at Storm Time Injection Fronts |
| title_fullStr | Electron Energization Signatures in Traveling Kinetic Alfvén Waves at Storm Time Injection Fronts |
| title_full_unstemmed | Electron Energization Signatures in Traveling Kinetic Alfvén Waves at Storm Time Injection Fronts |
| title_short | Electron Energization Signatures in Traveling Kinetic Alfvén Waves at Storm Time Injection Fronts |
| title_sort | electron energization signatures in traveling kinetic alfven waves at storm time injection fronts |
| topic | dispersive Alfven waves field aligned electrons inner magnetosphere kinetic Alfvén waves geomagnetic storms substorms |
| url | https://doi.org/10.1029/2022GL099318 |
| work_keys_str_mv | AT ajhull electronenergizationsignaturesintravelingkineticalfvenwavesatstormtimeinjectionfronts AT padamiano electronenergizationsignaturesintravelingkineticalfvenwavesatstormtimeinjectionfronts AT ccchaston electronenergizationsignaturesintravelingkineticalfvenwavesatstormtimeinjectionfronts AT jrjohnson electronenergizationsignaturesintravelingkineticalfvenwavesatstormtimeinjectionfronts AT gdreeves electronenergizationsignaturesintravelingkineticalfvenwavesatstormtimeinjectionfronts |