Equatorial Spread F Found in AN Old Airglow Scan Atlas of Dudley Observatory

Details Equatorial Spread F Found in AN Old Airglow Scan Atlas of Dudley Observatory Equatorial Spread F Found in AN Old Airglow Scan Atlas of Dudley Observatory

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa32a0683k&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA32A-0683

Other

2415 Equatorial Ionosphere, 2427 Ionosphere/Atmosphere Interactions (0335), 2435 Ionospheric Disturbances, 2439 Ionospheric Irregularities

Scientific paper

We have searched for F-region ionospheric disturbances in the airglow scan atlas of Dudley observatory. The airglow scan observations were made with narrow band filters of OI 5577 A and OI 6300 A for 164 nights at Haleakala, Maui in the period of April 1965 through October 1968. The OI 6300 emissions are produced mostly via recombination of O2+ in the F-region, whereas the OI 5577 emissions are generated both in the E- and F-regions. The Dudley atlas of the airglow scan has unique significance, since it covers more than three years of observations in 1960's when there was no other program to monitor ionospheric airglows. We find disturbances in the OI airglow brightness, from which we constructed projected maps of airglow distributions at the F-region altitude. The projected maps clearly show wavelike disturbances whose crests are mostly aligned along north-south direction. The disturbances were found exclusively in the southern azimuth (toward the equator), implying that they are one of the equatorial ionospheric irregularities, known as equatorial spread F (ESF). The ESF disturbances occurred 19 nights out of total 164 nights of observations with a maximum in September. The disturbances seem to arise regardless of geomagnetic activities. The seasonal variation of the occurrence is consistent with recent analyses of satellite data in which ESF is suggested to be caused by gravity waves from the troposphere where they are generated by strong convection in inter-tropical convergence zone.

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