Mass and electron densities in the inner magnetosphere during a prolonged disturbed interval
The equatorial plasma density and composition at L = 2.5 were studied during an extended disturbed interval using field line resonance measurements (yielding plasma mass density), naturally and artificially stimulated VLF whistlers (electron number density) and IMAGE EUV observations (plasmapause po...
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Published in | Geophysical research letters Vol. 34; no. 2; pp. L02108 - n/a |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Washington, DC
American Geophysical Union
01.01.2007
Blackwell Publishing Ltd |
Subjects | |
Online Access | Get full text |
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Summary: | The equatorial plasma density and composition at L = 2.5 were studied during an extended disturbed interval using field line resonance measurements (yielding plasma mass density), naturally and artificially stimulated VLF whistlers (electron number density) and IMAGE EUV observations (plasmapause position and line‐of‐sight He+ intensity). During the storm the plasmapause moved to L < 2.5 and at least one density notch and drainage plume formed. These features were evident in all the data sets for some days. One notch extended from 2.4–4.5 RE and spanned <4 hours in MLT. Plume mass and electron densities were enhanced by a factor of about 3. In the plasmasphere and plasmatrough the H+: He+: O+ composition by number was ∼82:15:3. However, just outside the plasmapause the O+ concentration exceeded 50%, suggesting the presence of an oxygen torus. |
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Bibliography: | ArticleID:2006GL028254 Tab-delimited Table 1. ark:/67375/WNG-0JX48Z16-F istex:BE03424B9551698CB7D9B81C439FAA9A6C4E42E0 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0094-8276 1944-8007 |
DOI: | 10.1029/2006GL028254 |