Physics
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44..547t&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 44, June 1982, p. 547-557.
Physics
25
Airglow, Atmospheric Ionization, F Region, Transequatorial Propagation, Bubbles, Height, Oxygen, Plasma Density, Tropical Regions
Scientific paper
The observation of the characteristics of the large-scale bubbles of low-density plasma found in the tropical ionospheric F region from field aligned observations of airglow emissions is considered. The geometry of field-aligned airglow observations is illustrated for a dip latitude of 18 deg, and the use of O I recombination emission ratios at 6300 and 7774 A to obtain a value for the height of the peak plasma concentration is explained. The imaging characteristics for observation sites in the optimum range between 17 and 23 deg dip latitude are calculated, and it is shown that useful data may be obtained over an east-west range of more than 1000 km from the magnetic meridian. In addition, measurements within the meridian with an angular resolution of 0.1 deg are capable of showing structures as small as 2 km. The desirability of simultaneous observations from sites at magnetic conjugate points and from a site in the meridian of an incoherent scatter radar is pointed out.
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