Produção Nacional
Equatorial plasma bubble eastward velocity characteristics from scanning airglow photometer measurements over Cachoeira Paulista
1985; Elsevier BV; Volume: 47; Issue: 8-10 Linguagem: Inglês
10.1016/0021-9169(85)90064-9
ISSN1878-593X
AutoresJ. H. A. Sobral, M. A. Abdu, Y. Sahai,
Tópico(s)GNSS positioning and interference
ResumoRegular observations were carried out of airglow depletion patch motion, associated with equatorial plasma bubble events, using east-west and meridional scan OI 6300 Å airglow photometers over Cachoeira Paulista (22°42′S, 45°W, dip −26°), Brazil. Results from the east-west scan photometer for 31 nights obtained during the period January 1980–February 1981 that are analysed in the present work show that eastward motion of airglow depletion patches is a regular phenomenon in the post-sunset period, extending often to early morning hours (~02 LT), during the summer-equinoctial months. Such moving airglow structures were absent during the winter months (June, July and August). The main results from this first extensive study of the airglow depletion patch zonal movements over Cachoeira Paulista are the following: (1) the night-time mean eastward drift velocities for the months January–May 1980 are higher than those for the period September 1980–February 1981; (2) plots of eastward velocity versus local time for the second period mentioned in (a) show a decrease of the drift velocity with local time, while for the first group the velocity oscillates around an apparently local time-independent mean value; (3)the drift velocities vary in varying degrees with geomagnetic activity index Kp. These results are discussed in the light of other reported measurements of the zonal F-region plasma motions.
Referência(s)