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The light ion trough.A distinct feature of the ion composition results from the OGO-2, 4 and 6 satellites is the light ion trough, wherein the mid-latitude concentrations of H+ and He+ decrease sharply with latitude. In contrast to the 'main trough' in electron density observed primarily as a nightside phenomenon, the light ion trough persists during both day and night. For daytime winter hemisphere conditions and for all seasons during night, the mid-latitude light ion concentration decrease is a pronounced feature. In the dayside summer and equinox hemispheres, the rate of light ion decrease with latitude is comparatively gradual, and the trough boundary is less well defined, particularly for quiet magnetic conditions. In response to magnetic storms, the light ion trough minimum moves equatorward, and deepens, consistent with earlier evidence of the contraction of the plasmasphere in response to storm time enhancements in magnetospheric plasma convection.
Document ID
19730027102
Document Type
Reprint (Version printed in journal)
Authors
Taylor, H. A., Jr. (NASA Goddard Space Flight Center Laboratory for Planetary Atmospheres, Greenbelt, Md., United States)
Date Acquired
August 7, 2013
Publication Date
October 1, 1972
Publication Information
Publication: Planetary and Space Science
Volume: 20
Subject Category
GEOPHYSICS
Report/Patent Number
NSSDC-ID-65-081A-15-PM
NSSDC-ID-69-051A-05-PM
Distribution Limits
Public
Copyright
Other