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Title: Spacecraft surface charging within geosynchronous orbit observed by the Van Allen Probes

Using the Helium Oxygen Proton Electron (HOPE) and Electric Field and Waves (EFW) instruments from the Van Allen Probes, we explored the relationship between electron energy fluxes in the eV and keV ranges and spacecraft surface charging. We present statistical results on spacecraft charging within geosynchronous orbit by L and MLT. An algorithm to extract the H+ charging line in the HOPE instrument data was developed to better explore intense charging events. Also, this study explored how spacecraft potential relates to electron number density, electron pressure, electron temperature, thermal electron current, and low-energy ion density between 1 and 210 eV. It is demonstrated that it is imperative to use both EFW potential measurements and the HOPE instrument ion charging line for examining times of extreme spacecraft charging of the Van Allen Probes. The results of this study show that elevated electron energy fluxes and high-electron pressures are present during times of spacecraft charging but these same conditions may also occur during noncharging times. Furthermore, we also show noneclipse significant negative charging events on the Van Allen Probes.
Authors:
 [1] ;  [2] ;  [2] ;  [1] ;  [3] ;  [3] ;  [4]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of Minnesota, Minneapolis, MN (United States)
  4. Planetary Science Institute, Tucson, AZ (United States)
Publication Date:
Report Number(s):
LA-UR-15-27864
Journal ID: ISSN 1542-7390
Grant/Contract Number:
NWX11AO60G; NWX144AC02G; AGS-1102863; 967399; NAS5-01072; AC52-06NA25396; LA-UR-15-27864
Type:
Published Article
Journal Name:
Space Weather
Additional Journal Information:
Journal Volume: 14; Journal Issue: 2; Journal ID: ISSN 1542-7390
Publisher:
American Geophysical Union
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1239696
Alternate Identifier(s):
OSTI ID: 1239697; OSTI ID: 1247675