The relationship between the plasmapause and outer belt electrons
Abstract
Here, we quantify the spatial relationship between the plasmapause and outer belt electrons for a 5 day period, 15–20 January 2013, by comparing locations of relativistic electron flux peaks to the plasmapause. A peak-finding algorithm is applied to 1.8–7.7 MeV relativistic electron flux data. A plasmapause gradient finder is applied to wave-derived electron number densities >10 cm–3. We identify two outer belts. Outer belt 1 is a stable zone of >3 MeV electrons located 1–2 RE inside the plasmapause. Outer belt 2 is a dynamic zone of <3 MeV electrons within 0.5 RE of the moving plasmapause. Electron fluxes earthward of each belt's peak are anticorrelated with cold plasma density. Belt 1 decayed on hiss timescales prior to a disturbance on 17 January and suffered only a modest dropout, perhaps owing to shielding by the plasmasphere. Afterward, the partially depleted belt 1 continued to decay at the initial rate. Belt 2 was emptied out by strong disturbance-time losses but restored within 24 h. For global context we use a plasmapause test particle simulation and derive a new plasmaspheric index Fp, the fraction of a circular drift orbit inside the plasmapause. We find that the locally measured plasmapause is (for thismore »
- Authors:
-
- Southwest Research Institute, San Antonio, TX (United States); Univ. of Texas, San Antonio, TX (United States)
- Univ. of Colorado, Boulder, CO (United States)
- The Aerospace Corp., Los Angeles, CA (United States)
- Univ. of Iowa, Iowa City, IA (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- UCLA, Los Angeles, CA (United States)
- Univ. of New Hampshire, Durham, NH (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- National Aeronautics and Space Administration (NASA); USDOE
- OSTI Identifier:
- 1325657
- Report Number(s):
- LA-UR-16-25977
Journal ID: ISSN 2169-9380
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Space Physics
- Additional Journal Information:
- Journal Name: Journal of Geophysical Research. Space Physics; Journal ID: ISSN 2169-9380
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Heliospheric and Magnetospheric Physics
Citation Formats
Goldstein, J., Baker, D. N., Blake, J. B., De Pascuale, S., Funsten, H. O., Jaynes, A. N., Jahn, J. -M., Kletzing, C. A., Kurth, W. S., Li, W., Reeves, G. D., and Spence, H. E. The relationship between the plasmapause and outer belt electrons. United States: N. p., 2016.
Web. doi:10.1002/2016JA023046.
Goldstein, J., Baker, D. N., Blake, J. B., De Pascuale, S., Funsten, H. O., Jaynes, A. N., Jahn, J. -M., Kletzing, C. A., Kurth, W. S., Li, W., Reeves, G. D., & Spence, H. E. The relationship between the plasmapause and outer belt electrons. United States. https://doi.org/10.1002/2016JA023046
Goldstein, J., Baker, D. N., Blake, J. B., De Pascuale, S., Funsten, H. O., Jaynes, A. N., Jahn, J. -M., Kletzing, C. A., Kurth, W. S., Li, W., Reeves, G. D., and Spence, H. E. Thu .
"The relationship between the plasmapause and outer belt electrons". United States. https://doi.org/10.1002/2016JA023046. https://www.osti.gov/servlets/purl/1325657.
@article{osti_1325657,
title = {The relationship between the plasmapause and outer belt electrons},
author = {Goldstein, J. and Baker, D. N. and Blake, J. B. and De Pascuale, S. and Funsten, H. O. and Jaynes, A. N. and Jahn, J. -M. and Kletzing, C. A. and Kurth, W. S. and Li, W. and Reeves, G. D. and Spence, H. E.},
abstractNote = {Here, we quantify the spatial relationship between the plasmapause and outer belt electrons for a 5 day period, 15–20 January 2013, by comparing locations of relativistic electron flux peaks to the plasmapause. A peak-finding algorithm is applied to 1.8–7.7 MeV relativistic electron flux data. A plasmapause gradient finder is applied to wave-derived electron number densities >10 cm–3. We identify two outer belts. Outer belt 1 is a stable zone of >3 MeV electrons located 1–2 RE inside the plasmapause. Outer belt 2 is a dynamic zone of <3 MeV electrons within 0.5 RE of the moving plasmapause. Electron fluxes earthward of each belt's peak are anticorrelated with cold plasma density. Belt 1 decayed on hiss timescales prior to a disturbance on 17 January and suffered only a modest dropout, perhaps owing to shielding by the plasmasphere. Afterward, the partially depleted belt 1 continued to decay at the initial rate. Belt 2 was emptied out by strong disturbance-time losses but restored within 24 h. For global context we use a plasmapause test particle simulation and derive a new plasmaspheric index Fp, the fraction of a circular drift orbit inside the plasmapause. We find that the locally measured plasmapause is (for this event) a good proxy for the globally integrated opportunity for losses in cold plasma. Our analysis of the 15–20 January 2013 time interval confirms that high-energy electron storage rings can persist for weeks or even months if prolonged quiet conditions prevail. This case study must be followed up by more general study (not limited to a 5 day period).},
doi = {10.1002/2016JA023046},
journal = {Journal of Geophysical Research. Space Physics},
number = ,
volume = ,
place = {United States},
year = {Thu Sep 01 00:00:00 EDT 2016},
month = {Thu Sep 01 00:00:00 EDT 2016}
}
Web of Science
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