Accession Number:

ADA257764

Title:

Models of Ionospheric Release Experiments. Part 1: SF sub 6 Releases; Part 2: CO sub 2 Releases

Descriptive Note:

Scientific rept. no. 1

Corporate Author:

MISSION RESEARCH CORP NASHUA NH

Personal Author(s):

Report Date:

1991-08-01

Pagination or Media Count:

146.0

Abstract:

High-altitude chemical releases are investigated with the use of several numerical models of chemistry, dynamics, and electrodynamics. The specific releases investigated were SF sub 6 and CO sub 2 in the F-region of the ionosphere. The chemistry for reproducing observations from the CRRES-at- Kwajalein SF sub 6 release must include oxidation reactions of ions and neutrals. The dominant negative ion observed, F-, was modeled well with SF- sub 5 O yields SOF sub 4 F- as the dominant production mechanism. SOF- sub 3 is potentially an important negative ion resulting from electron attachment of SOF sub 4. The electrodynamic model of the SF sub 6 release did not produce a plasma depletion plume as was hoped. The electrodynamic perturbation is small and short-lived. It will not produce large-scale plume structure associated with equatorial spread-F. The modeling of CO sub 2 releases produced too much 6300A airglow when compared with REDAIR experimental results. The conflict between simulation and experiment requires reduction of CO sub 2 O reaction rates or inclusion of a CO sub 2 removal mechanism such as freezing. Modeling also shows that the two CO sub 2 releases of the REDAIR experiment may have spatially mixed airglow signatures.

Subject Categories:

  • Atmospheric Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE