All Physics Faculty Publications

Document Type

Article

Journal/Book Title/Conference

Advances in Space Research

Volume

27

Issue

10

Publisher

Elsevier

Publication Date

10-2001

First Page

1749

Last Page

1754

Abstract

An all-sky CCD airglow imager has been used to obtain a wealth of data on the MLT airglow emissions from Cachoeira Paulista, Brazil (22.7° S, 45.0° W). Measurements of the NIR OH, OI(557.7 nm), O2(0,1) and the thermospheric OI(630.0 nm) emissions have been made since October 1998. In addition, simultaneous measurements of the airglow zenith intensities and rotational temperatures, and vertical wind structure between 80 and 100 km were made using a co-located multi-channel photometer and a meteor radar. On the night of July 13, 1999, the CCD images showed active wave events exhibiting a variety of short period wave structures. The activity started with ripple patterns over the whole sky, lasting for almost one hour. Later the patterns changed to extensive band-like structures that lasted for several hours. After local midnight a bore-like wave-front passed overhead propagating towards the North. When the front was in the zenith the image data showed an increase in both the OI (5577 nm) and O2 (0,1) emissions, whilst a decrease in the OH intensity was observed, which is opposite to that observed by Taylor, (1995a). The co-located photometer revealed an exceptionally large intensity (40%) and temperature (∼12%) perturbation throughout the night that appears to be associated with a large-scale gravity wave perturbation with significant vertical phase shift between the different emissions.

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Published by Elsevier in Advances in Space Research.

http://www.sciencedirect.com/science/article/pii/S0273117701003179

Publisher PDF is available for download through the link above.

http://www.sciencedirect.com/science/article/pii/S0273117701003179

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