Correlated Pc4-5 ULF waves, whistler-mode chorus, and pulsating aurora observed by the Van Allen Probes and ground-based systems
Abstract
Theory and observations have linked equatorial VLF waves with pulsating aurora for decades, invoking the process of pitch angle scattering of tens of keV electrons in the equatorial magnetosphere. Recently published satellite studies have strengthened this argument, by showing strong correlation between pulsating auroral patches and both lower-band chorus and tens of keV electron modulation in the vicinity of geosynchronous orbit. Additionally, a previous link has been made between Pc4–5 compressional pulsations and modulation of whistler-mode chorus using Time History of Events and Macroscale Interactions during Substorms. In the current study, we present simultaneous in situ observations of structured chorus waves and an apparent field line resonance (in the Pc4–5 range) as a result of a substorm injection, observed by Van Allen Probes, along with ground-based observations of pulsating aurora. We demonstrate the likely scenario being one of substorm-driven Pc4–5 ULF pulsations modulating chorus waves, and thus providing the driver for pulsating particle precipitation into the Earth's atmosphere. Interestingly, the modulated chorus wave and ULF wave periods are well correlated, with chorus occurring at half the periodicity of the ULF waves. We also show, for the first time, a particular few-Hz modulation of individual chorus elements that coincides with themore »
- Authors:
-
- Univ. of Colorado, Boulder, CO (United States)
- Univ. of New Hampshire, Durham, NH (United States)
- The Johns Hopkins Univ. Applied Physics Laboratory, Laurel, MD (United States)
- Univ. of Maryland, College Park, MD (United States); NASA GSFC, Greenbelt, MD (United States)
- Univ. of Calgary, Calgary, AB (Canada)
- Aerospace Corporation, El Segundo, CA (United States)
- Univ. of Iowa, Iowa City, IA (United States)
- New Mexico Consortium, Los Alamos, NM (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- NASA GSFC, Greenbelt, MD (United States)
- Univ. of Minnesota, Minneapolis, MN (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1236778
- Report Number(s):
- LA-UR-15-27788
Journal ID: ISSN 2169-9380
- Grant/Contract Number:
- contract 428 967399; contract NAS5-01072; NNX13AO43H; NNX14AB97G; AGS-1456161; AGS-1456129; AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Space Physics
- Additional Journal Information:
- Journal Volume: 120; Journal Issue: 10; Journal ID: ISSN 2169-9380
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES
Citation Formats
Jaynes, A. N., Lessard, M. R., Takahashi, K., Ali, A. F., Malaspina, D. M., Michell, R. G., Spanswick, E. L., Baker, D. N., Blake, J. B., Cully, C., Donovan, E. F., Kletzing, C. A., Reeves, G. D., Samara, M., Spence, H. E., and Wygant, J. R. Correlated Pc4-5 ULF waves, whistler-mode chorus, and pulsating aurora observed by the Van Allen Probes and ground-based systems. United States: N. p., 2015.
Web. doi:10.1002/2015JA021380.
Jaynes, A. N., Lessard, M. R., Takahashi, K., Ali, A. F., Malaspina, D. M., Michell, R. G., Spanswick, E. L., Baker, D. N., Blake, J. B., Cully, C., Donovan, E. F., Kletzing, C. A., Reeves, G. D., Samara, M., Spence, H. E., & Wygant, J. R. Correlated Pc4-5 ULF waves, whistler-mode chorus, and pulsating aurora observed by the Van Allen Probes and ground-based systems. United States. https://doi.org/10.1002/2015JA021380
Jaynes, A. N., Lessard, M. R., Takahashi, K., Ali, A. F., Malaspina, D. M., Michell, R. G., Spanswick, E. L., Baker, D. N., Blake, J. B., Cully, C., Donovan, E. F., Kletzing, C. A., Reeves, G. D., Samara, M., Spence, H. E., and Wygant, J. R. Wed .
"Correlated Pc4-5 ULF waves, whistler-mode chorus, and pulsating aurora observed by the Van Allen Probes and ground-based systems". United States. https://doi.org/10.1002/2015JA021380. https://www.osti.gov/servlets/purl/1236778.
@article{osti_1236778,
title = {Correlated Pc4-5 ULF waves, whistler-mode chorus, and pulsating aurora observed by the Van Allen Probes and ground-based systems},
author = {Jaynes, A. N. and Lessard, M. R. and Takahashi, K. and Ali, A. F. and Malaspina, D. M. and Michell, R. G. and Spanswick, E. L. and Baker, D. N. and Blake, J. B. and Cully, C. and Donovan, E. F. and Kletzing, C. A. and Reeves, G. D. and Samara, M. and Spence, H. E. and Wygant, J. R.},
abstractNote = {Theory and observations have linked equatorial VLF waves with pulsating aurora for decades, invoking the process of pitch angle scattering of tens of keV electrons in the equatorial magnetosphere. Recently published satellite studies have strengthened this argument, by showing strong correlation between pulsating auroral patches and both lower-band chorus and tens of keV electron modulation in the vicinity of geosynchronous orbit. Additionally, a previous link has been made between Pc4–5 compressional pulsations and modulation of whistler-mode chorus using Time History of Events and Macroscale Interactions during Substorms. In the current study, we present simultaneous in situ observations of structured chorus waves and an apparent field line resonance (in the Pc4–5 range) as a result of a substorm injection, observed by Van Allen Probes, along with ground-based observations of pulsating aurora. We demonstrate the likely scenario being one of substorm-driven Pc4–5 ULF pulsations modulating chorus waves, and thus providing the driver for pulsating particle precipitation into the Earth's atmosphere. Interestingly, the modulated chorus wave and ULF wave periods are well correlated, with chorus occurring at half the periodicity of the ULF waves. We also show, for the first time, a particular few-Hz modulation of individual chorus elements that coincides with the same modulation in a nearby pulsating aurora patch. As a result, such modulation has been noticed as a high-frequency component in ground-based camera data of pulsating aurora for decades and may be a result of nonlinear chorus wave interactions in the equatorial region.},
doi = {10.1002/2015JA021380},
journal = {Journal of Geophysical Research. Space Physics},
number = 10,
volume = 120,
place = {United States},
year = {Wed Oct 28 00:00:00 EDT 2015},
month = {Wed Oct 28 00:00:00 EDT 2015}
}
Web of Science
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Pc5 waves generated by substorm injection: a case study
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Works referencing / citing this record:
Modulation of chorus intensity by ULF waves deep in the inner magnetosphere: CHORUS MODULATION BY ULF WAVES
journal, September 2016
- Xia, Zhiyang; Chen, Lunjin; Dai, Lei
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Periodic Excitation of Chorus and ECH Waves Modulated by Ultralow Frequency Compressions
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Experimental evidence of drift compressional waves in the magnetosphere: An Ekaterinburg coherent decameter radar case study
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Magnetospheric Chorus, Exohiss, and Magnetosonic Emissions Simultaneously Modulated by Fundamental Toroidal Standing Alfvén Waves Following Solar Wind Dynamic Pressure Fluctuations
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- Liu, Nigang; Su, Zhenpeng; Gao, Zhonglei
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Van Allen Probes observation of plasmaspheric hiss modulated by injected energetic electrons
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- Shi, Run; Li, Wen; Ma, Qianli
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Microscopic Observations of Pulsating Aurora Associated With Chorus Element Structures: Coordinated Arase Satellite‐PWING Observations
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