Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/74992
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Type: | Journal article |
Title: | An intense traveling airglow front in the upper mesosphere-lower thermosphere with characteristics of a bore observed over Alice Springs, Australia, during a strong 2 day wave episode |
Author: | Walterscheid, R. Hecht, J. Gelinas, L. Hickey, M. Reid, I. |
Citation: | Journal of Geophysical Research, 2012; 117(22):1-13 |
Publisher: | Amer Geophysical Union |
Issue Date: | 2012 |
ISSN: | 0148-0227 2169-8996 |
Statement of Responsibility: | R. L. Walterscheid, J. H. Hecht, L. J. Gelinas, M. P. Hickey, and I. M. Reid |
Abstract: | The Aerospace Corporation's Nightglow Imager observed a large step function change in airglow in the form of a traveling front in the OH Meinel (OHM) and O2atmospheric (O2A) airglow emissions over Alice Springs, Australia, on 2 February 2003. The front exhibited nearly a factor of 2 stepwise increase in the OHM brightness and a stepwise decrease in the O2A brightness. There was significant (∼25 K) cooling behind the airglow fronts. The OHM airglow brightness behind the front was among the brightest for Alice Springs that we have measured in 7 years of observations. The event was associated with a strong phase-locked 2 day wave (PL/TDW). We have analyzed the wave trapping conditions for the upper mesosphere and lower thermosphere using a combination of data and empirical models and found that the airglow layers were located in a region of ducting. The PL/TDW-disturbed wind profile was effective in supporting a high degree of ducting, whereas without the PL/TDW the ducting was minimal or nonexistent. The change in brightness in each layer was associated with a strong leading disturbance followed by a train of weak barely visible waves. In OHM the leading disturbance was an isolated disturbance resembling a solitary wave. The characteristics of the wave train suggest an undular bore with some turbulent dissipation at the leading edge. |
Keywords: | 2 day wave airglow frontal events ducted gravity waves mesospheric bores solitary waves |
Description: | Extent: 13p. |
Rights: | ©2012. American Geophysical Union. All Rights Reserved |
DOI: | 10.1029/2012jd017847 |
Grant ID: | http://purl.org/au-research/grants/arc/DP0878144 http://purl.org/au-research/grants/arc/DP1096901 |
Published version: | http://dx.doi.org/10.1029/2012jd017847 |
Appears in Collections: | Aurora harvest 4 IPAS publications |
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hdl_74992.pdf | Published version | 1.58 MB | Adobe PDF | View/Open |
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