The Impenetrable Barrier: Suppression of Chorus Wave Growth by VLF Transmitters
Rapid radiation belt recovery following storm time depletion involves local acceleration of multi-MeV electrons in nonlinear interactions with VLF chorus waves. Previous studies of an apparent impenetrable barrier at L ~ 2.8 focused on diffusion and precipitation loss mechanisms for an explanation o...
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| Format: | Article |
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American Geophysical Union (AGU)
2021
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| Online Access: | https://hdl.handle.net/1721.1/131070 |
| _version_ | 1811076024535875584 |
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| author | Foster, John C Erickson, Philip J Omura, Yoshiharu Baker, Daniel N. |
| author2 | Haystack Observatory |
| author_facet | Haystack Observatory Foster, John C Erickson, Philip J Omura, Yoshiharu Baker, Daniel N. |
| author_sort | Foster, John C |
| collection | MIT |
| description | Rapid radiation belt recovery following storm time depletion involves local acceleration of multi-MeV electrons in nonlinear interactions with VLF chorus waves. Previous studies of an apparent impenetrable barrier at L ~ 2.8 focused on diffusion and precipitation loss mechanisms for an explanation of the sharp reduction of multi-MeV electron fluxes earthward of L ~ 3. Van Allen Probes observations for cases when the plasmasphere is contracted earthward of L ~ 3 indicate that strong coherent signals from VLF transmitters can play significant roles in the suppression of nonlinear chorus wave growth earthward of L ~ 3. As a result, local nonlinear acceleration of hundreds of keV electrons to MeV energies does not occur in this region. During the recovery of the outer radiation belt when the plasmasphere is significantly contracted, the suppression of chorus wave growth and local acceleration by the action of the transmitter waves at the outer edge of the VLF bubble contributes to the sharp inner edge of the new MeV electron population and the formation of the impenetrable barrier at L ~ 2.8. |
| first_indexed | 2024-09-23T10:14:54Z |
| format | Article |
| id | mit-1721.1/131070 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T10:14:54Z |
| publishDate | 2021 |
| publisher | American Geophysical Union (AGU) |
| record_format | dspace |
| spelling | mit-1721.1/1310702022-09-30T19:54:43Z The Impenetrable Barrier: Suppression of Chorus Wave Growth by VLF Transmitters Foster, John C Erickson, Philip J Omura, Yoshiharu Baker, Daniel N. Haystack Observatory Foster, John C. Rapid radiation belt recovery following storm time depletion involves local acceleration of multi-MeV electrons in nonlinear interactions with VLF chorus waves. Previous studies of an apparent impenetrable barrier at L ~ 2.8 focused on diffusion and precipitation loss mechanisms for an explanation of the sharp reduction of multi-MeV electron fluxes earthward of L ~ 3. Van Allen Probes observations for cases when the plasmasphere is contracted earthward of L ~ 3 indicate that strong coherent signals from VLF transmitters can play significant roles in the suppression of nonlinear chorus wave growth earthward of L ~ 3. As a result, local nonlinear acceleration of hundreds of keV electrons to MeV energies does not occur in this region. During the recovery of the outer radiation belt when the plasmasphere is significantly contracted, the suppression of chorus wave growth and local acceleration by the action of the transmitter waves at the outer edge of the VLF bubble contributes to the sharp inner edge of the new MeV electron population and the formation of the impenetrable barrier at L ~ 2.8. NASA (Contract NAS5‐01072) 2021-07-13T15:31:44Z 2021-07-13T15:31:44Z 2020-09 2020-02 Article http://purl.org/eprint/type/JournalArticle 2169-9380 2169-9402 https://hdl.handle.net/1721.1/131070 Foster, John C. et al. "The Impenetrable Barrier: Suppression of Chorus Wave Growth by VLF Transmitters." JGR Space Physics 125, 9 (September 2020): e2020JA027913. © 2020 American Geophysical Union http://dx.doi.org/10.1029/2020ja027913 JGR Space Physics Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Geophysical Union (AGU) John Foster |
| spellingShingle | Foster, John C Erickson, Philip J Omura, Yoshiharu Baker, Daniel N. The Impenetrable Barrier: Suppression of Chorus Wave Growth by VLF Transmitters |
| title | The Impenetrable Barrier: Suppression of Chorus Wave Growth by VLF Transmitters |
| title_full | The Impenetrable Barrier: Suppression of Chorus Wave Growth by VLF Transmitters |
| title_fullStr | The Impenetrable Barrier: Suppression of Chorus Wave Growth by VLF Transmitters |
| title_full_unstemmed | The Impenetrable Barrier: Suppression of Chorus Wave Growth by VLF Transmitters |
| title_short | The Impenetrable Barrier: Suppression of Chorus Wave Growth by VLF Transmitters |
| title_sort | impenetrable barrier suppression of chorus wave growth by vlf transmitters |
| url | https://hdl.handle.net/1721.1/131070 |
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