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Atmospheric response in aurora experiment: Observations of E and F region neutral winds in a region of postmidnight diffuse auroraThe goal of the Atmospheric Response in Aurora (ARIA) experiment carried out at Poker Flat, Alaska, on March 3, 1992, was to determine the response of the neutral atmosphere to the long-lived, large-scale forcing that is characteristic of the diffuse aurora in the post midnight sector. A combination of chemical release rocket wind measurements, instrumented rocket composition measurements, and ground-based optical measurements were used to characterize the response of the neutral atmosphere. The rocket measurements were made at the end of a 90-min period of strong Joule heating. We focus on the neutral wind measurements made with the rocket. The forcing was determined by running the assimilated mapping of ionospheric electrodynamics (AMIE) analysis procedure developed at the National Center for Atmospheric Research. The winds expected at the latitude and longitude of the experiment were calculated using the spectral thermospheric general circulation model developed at the Danish Meteorological Institute. Comparisons of the observations and the model suggest that the neutral winds responded strongly in two height ranges. An eastward wind perturbation of approximately 100 m/s developed between 140 and 200 km altitude with a peak near 160 km. A southwestward wind with peak magnitude of approximately 150 m/s developed near 115 km altitude. The large amplitude winds at the lower altitude are particularly surprising. They appear to be associated with the upward propagating semidiurnal tide. However, the amplitude is much larger than predicted by any of the tidal models, and the shear found just below the peak in the winds was nominally unstable with a Richardson number of approximately 0.08.
Document ID
19960003992
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Larsen, M. F. (Clemson Univ. SC., United States)
Marshall, T. R. (Clemson Univ. SC., United States)
Mikkelsen, I. S. (Danish Meteorological Inst. Copenhagen, Denmark)
Emery, B. A. (National Center for Atmospheric Research Boulder, CO., United States)
Christensen, A. (Aerospace Corp. El Segundo, CA, United States)
Kayser, D. (Aerospace Corp. El Segundo, CA, United States)
Hecht, J. (Aerospace Corp. El Segundo, CA, United States)
Lyons, L. (Aerospace Corp. El Segundo, CA, United States)
Walterscheid, R. (Aerospace Corp. El Segundo, CA, United States)
Date Acquired
September 6, 2013
Publication Date
November 1, 1995
Subject Category
Geophysics
Report/Patent Number
NAS 1.26:199706
NASA-CR-199706
REPT-95JA01346
NIPS-95-05900
ATR-94(8406)-3
Accession Number
96N14002
Funding Number(s)
CONTRACT_GRANT: NAG5-632
Distribution Limits
Public
Copyright
Public Use Permitted.

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