Southern hemisphere all-sky imaging investigations into the latitude extent of the 6300 Å emission feature associated with the midnight temperature maximum

Details Southern hemisphere all-sky imaging investigations into the latitude extent of the 6300 Å emission feature associated with the midnight temperature maximum Southern hemisphere all-sky imaging investigations into the latitude extent of the 6300 Å emission feature associated with the midnight temperature maximum

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa31a18c&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SA31A-18

Physics

0310 Airglow And Aurora, 0350 Pressure, Density, And Temperature, 0355 Thermosphere--Composition And Chemistry, 2415 Equatorial Ionosphere, 2437 Ionospheric Dynamics

Scientific paper

An all-sky imaging system has been in operation in Arequipa, Peru, (16.2\symbol{23}S, 71.35\symbol{23}W) from October 1993 - October 2000 conducting routine observations of 6300 Å airglow emissions. Using this imaging system, Colerico et al. [1996] reported on the persistent occurrence of an enhanced 6300 Å emission feature with an apparent north-south propagation through the field of view past 24\symbol{23}S near local midnight. This enhanced airglow feature was referred to as the midnight brightness wave (MBW). The authors concluded that MBW was the airglow signature of the thermospheric midnight temperature maximum (MTM), a highly variable, large scale neutral temperature anomaly which occurs at low latitudes. The MTM is accompanied by a pressure increase and a signature reversal/abatement in the meridional winds from equatorward to poleward. Poleward winds serve to move plasma down magnetic field lines to altitudes where it can dissociatively recombine and produce 6300 Å emissions. Additional imaging systems in operation south of Arequipa in Tucuman, Argentina, (26.5\symbol{23}S, 65.15\symbol{23}W) and El Leoncito, Argentina, (31.8\symbol{23}S, 69.0\symbol{23}W) extend the latitude range over which MBW events can be observed to 39\symbol{23}S. In this paper, we use the combined latitude range of the three imaging systems to investigate the latitudinal extent of the MTM's influence on upper atmospheric parameters. Observations of MBW propagation past 39\symbol{23}S suggest that the MTM's influence may be felt at mid-latitudes in the southern hemisphere.

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