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Title: Temporal evolution of ion spectral structures during a geomagnetic storm: Observations and modeling

Abstract

Using the Van Allen Probes/Helium, Oxygen, Proton, and Electron (HOPE) mass spectrometer, we perform a case study of the temporal evolution of ion spectral structures observed in the energy range of 1- ~50 keV throughout the geomagnetic storm of 2 October 2013. The ion spectral features are observed near the inner edge of the plasma sheet and are signatures of fresh transport from the plasma sheet into the inner magnetosphere. We find that the characteristics of the ion structures are determined by the intensity of the convection electric field. Prior to the beginning of the storm, the plasma sheet inner edge exhibits narrow nose spectral structures that vary little in energy across L values. Ion access to the inner magnetosphere during these times is limited to the nose energy bands. As convection is enhanced and large amounts of plasma are injected from the plasma sheet during the main phase of the storm, ion access occurs at a wide energy range, as no nose structures are observed. Here, as the magnetosphere recovers from the storm, single noses and then multiple noses are observed once again. Lastly, we use a model of ion drift and losses due to charge exchange to simulatemore » the ion spectra and gain insight into the main observed features.« less

Authors:
 [1];  [2];  [2];  [2]; ORCiD logo [3]; ORCiD logo [3];  [3]; ORCiD logo [3]
  1. Univ. of New Hampshire, Durham, NH (United States). Space Science Center, Dept. of Physics; New Mexico Consortium (NMC), Los Alamos, NM (United States)
  2. Univ. of New Hampshire, Durham, NH (United States). Space Science Center, Dept. of Physics
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
National Aeronautic and Space Administration (NASA); USDOE
OSTI Identifier:
1414117
Report Number(s):
LA-UR-17-29189
Journal ID: ISSN 2169-9380; TRN: US1800643
Grant/Contract Number:  
AC52-06NA25396; NAS5-01072; NNX13AE23G
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 123; Journal Issue: 1; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Heliospheric and Magnetospheric Physics

Citation Formats

Ferradas Alva, Cristian Pablo, Zhang, J.-C., Spence, H. E., Kistler, L. M., Larsen, Brian Arthur, Reeves, Geoffrey D., Skoug, Ruth M., and Funsten, Herbert O. Temporal evolution of ion spectral structures during a geomagnetic storm: Observations and modeling. United States: N. p., 2017. Web. doi:10.1002/2017JA024702.
Ferradas Alva, Cristian Pablo, Zhang, J.-C., Spence, H. E., Kistler, L. M., Larsen, Brian Arthur, Reeves, Geoffrey D., Skoug, Ruth M., & Funsten, Herbert O. Temporal evolution of ion spectral structures during a geomagnetic storm: Observations and modeling. United States. doi:10.1002/2017JA024702.
Ferradas Alva, Cristian Pablo, Zhang, J.-C., Spence, H. E., Kistler, L. M., Larsen, Brian Arthur, Reeves, Geoffrey D., Skoug, Ruth M., and Funsten, Herbert O. Wed . "Temporal evolution of ion spectral structures during a geomagnetic storm: Observations and modeling". United States. doi:10.1002/2017JA024702. https://www.osti.gov/servlets/purl/1414117.
@article{osti_1414117,
title = {Temporal evolution of ion spectral structures during a geomagnetic storm: Observations and modeling},
author = {Ferradas Alva, Cristian Pablo and Zhang, J.-C. and Spence, H. E. and Kistler, L. M. and Larsen, Brian Arthur and Reeves, Geoffrey D. and Skoug, Ruth M. and Funsten, Herbert O.},
abstractNote = {Using the Van Allen Probes/Helium, Oxygen, Proton, and Electron (HOPE) mass spectrometer, we perform a case study of the temporal evolution of ion spectral structures observed in the energy range of 1- ~50 keV throughout the geomagnetic storm of 2 October 2013. The ion spectral features are observed near the inner edge of the plasma sheet and are signatures of fresh transport from the plasma sheet into the inner magnetosphere. We find that the characteristics of the ion structures are determined by the intensity of the convection electric field. Prior to the beginning of the storm, the plasma sheet inner edge exhibits narrow nose spectral structures that vary little in energy across L values. Ion access to the inner magnetosphere during these times is limited to the nose energy bands. As convection is enhanced and large amounts of plasma are injected from the plasma sheet during the main phase of the storm, ion access occurs at a wide energy range, as no nose structures are observed. Here, as the magnetosphere recovers from the storm, single noses and then multiple noses are observed once again. Lastly, we use a model of ion drift and losses due to charge exchange to simulate the ion spectra and gain insight into the main observed features.},
doi = {10.1002/2017JA024702},
journal = {Journal of Geophysical Research. Space Physics},
number = 1,
volume = 123,
place = {United States},
year = {2017},
month = {12}
}

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