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New fine structure cooling rateOne of the dominant electron cooling processes in the ionosphere is caused by electron impact induced fine structure transitions among the ground state levels of atomic oxygen. This fine structure cooling rate is based on theoretical cross sections. Recent advances in the numerical cross section determinations to include polarization effects and more accurate representations of the atomic target result in new lower values. These cross sections are employed in this paper to derive a new fine structure cooling rate which is between 40% and 60% of the currently used rate. A new generalized formula is presented for the cooling rate (from which the fine structure cooling rate is derived), valid for arbitrary mass and temperature difference of the colliding particles and arbitrary inelastic energy difference.
Document ID
19760018824
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Hoegy, W. R. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 3, 2013
Publication Date
March 1, 1976
Subject Category
Atomic And Molecular Physics
Report/Patent Number
X-621-76-64
NASA-TM-X-71117
Accession Number
76N25912
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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