Cross-scale observations of the 2015 St. Patrick's day storm: THEMIS, Van Allen Probes, and TWINS
- Southwest Research Inst. (SwRI), San Antonio, TX (United States). Space Science and Engineering Division; Univ. of Texas, San Antonio, TX (United States). Dept. of Physics and Astronomy
- Univ. of California, Los Angeles, CA (United States). Inst. of Geophysics and Planetary Physics
- Univ. of Iowa, Iowa City, IA (United States). Dept. of Physics and Astronomy
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Princeton Univ., NJ (United States). Dept. of Astrophysical Science
- Auburn Univ., AL (United States). Physics Dept.
- Univ. of New Hampshire, Durham, NH (United States). Inst. for the Study of Earth, Oceans, and Space
- Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Physics and Astronomy
In this paper, we present cross-scale magnetospheric observations of the 17 March 2015 (St. Patrick's Day) storm, by Time History of Events and Macroscale Interactions during Substorms (THEMIS), Van Allen Probes (Radiation Belt Storm Probes), and Two Wide-angle Imaging Neutral-atom Spectrometers (TWINS), plus upstream ACE/Wind solar wind data. THEMIS crossed the bow shock or magnetopause 22 times and observed the magnetospheric compression that initiated the storm. Empirical models reproduce these boundary locations within 0.7 RE. Van Allen Probes crossed the plasmapause 13 times; test particle simulations reproduce these encounters within 0.5 RE. Before the storm, Van Allen Probes measured quiet double-nose proton spectra in the region of corotating cold plasma. About 15 min after a 0605 UT dayside southward turning, Van Allen Probes captured the onset of inner magnetospheric convection, as a density decrease at the moving corotation-convection boundary (CCB) and a steep increase in ring current (RC) proton flux. During the first several hours of the storm, Van Allen Probes measured highly dynamic ion signatures (numerous injections and multiple spectral peaks). Sustained convection after ~1200 UT initiated a major buildup of the midnight-sector ring current (measured by RBSP A), with much weaker duskside fluxes (measured by RBSP B, THEMIS a and THEMIS d). A close conjunction of THEMIS d, RBSP A, and TWINS 1 at 1631 UT shows good three-way agreement in the shapes of two-peak spectra from the center of the partial RC. A midstorm injection, observed by Van Allen Probes and TWINS at 1740 UT, brought in fresh ions with lower average energies (leading to globally less energetic spectra in precipitating ions) but increased the total pressure. Finally, the cross-scale measurements of 17 March 2015 contain significant spatial, spectral, and temporal structure.
- Research Organization:
- Southwest Research Institute, San Antonio, TX (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE; National Aeronautics and Space Administration (NASA)
- Grant/Contract Number:
- AC52-06NA25396; NNX14AC14G; NAS5-01072
- OSTI ID:
- 1402617
- Report Number(s):
- LA-UR-16-26167; TRN: US1703011
- Journal Information:
- Journal of Geophysical Research. Space Physics, Vol. 122, Issue 1; ISSN 2169-9380
- Publisher:
- American Geophysical UnionCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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journal | March 2019 |
A Simulation of the Field‐Aligned Plasma Transport in the Plasmaspheric Plume During the 2015 St. Patrick's Day Storm
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journal | November 2019 |
Dynamics of a geomagnetic storm on 7–10 September 2015 as observed by TWINS and simulated by CIMI
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journal | January 2018 |
Ground geomagnetic field and GIC response to March 17, 2015, storm
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journal | October 2018 |
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