Lower thermospheric composition changes derived from optical and radar data taken at Sondre Stromfjord during the great magnetic storm of February 1986

Journal Article · Mon Apr 01 04:00:00 EST 1991 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/90JA02460· OSTI ID:5186634

Hecht, J H; Christensen, A B; Kayser, D C; Walterscheid, R L ^[1]; Strickland, D J ^[2]

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1. Aerospace Corp., Los Angeles, CA (USA)
2. Computational Physics, Inc., Annadale, VA (USA)

Several nights of optical and radar data were obtained from February 3 to 10, 1986 at Sondre Stromfjord, Greenland during a great geomagnetic storm when Ap reached 202. These data, excluding O I (630.0 nm), were used to monitor changes in O and O{sub 2} densities in the region from 100 to 200 km and are consistent with results of Hecht et al. (1989) wherein the O I (630.0 nm) emission was used. That is, there were large depletions of O in the E region during the peak of the storm. Using 24-hour Ap values both MSIS-83 and MSIS-86 underestimated the depletion of O during the storm. MSIS-86 did noticeably worse than did MSIS-83, probably a result of the low exospheric temperature predicted by MSIS-86. However, when 3-hour ap values were used both models did better in predicting the measured O depletions, although MSIS-86 again was less successful than was MSIS-83. The data results also show that the enchancements in O{sub 2} were less than predicted by MSIS models in either mode. From 0200-0230 UT on February 9, 1986, a time just after the peak of geomagnetic activity as measured by Kp, the O mixing ratio near 135 km was found to increase by nearly a factor of 2. This increase is consistent with the passage of an atmospheric gravity wave through this altitude region providing that the scale height of O above 140 km is greater than predicted by the model.

• OSTI ID: 5186634
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 96:A4; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

640200 -- Atmospheric Physics
640201* -- Atmospheric Physics-- Auroral
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AURORAL ZONES
CHEMICAL COMPOSITION
COMPARATIVE EVALUATIONS
EARTH ATMOSPHERE
EVALUATION
GRAVITY WAVES
MAGNETIC STORMS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MONITORING
RADAR
RANGE FINDERS
THERMOSPHERE