Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa33a0268p&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SA33A-0268
Physics
2400 Ionosphere (6929), 2427 Ionosphere/Atmosphere Interactions (0335), 2435 Ionospheric Disturbances, 2437 Ionospheric Dynamics
Scientific paper
Observations of the OI 630.0 nm nightglow emission using a wide-angle imaging system have been carried out at Cachoeira Paulista (22.7°S, 45°W, 15.8°S dip latitude), Brazil during the period from January 1987 to September 2000. The OI 630 nm images obtained during this period show frequently travelling ionospheric disturbance in the tropical region frequently propagating from south-east to north-west. These dark patches moved with average speed of about 250 m/s at an altitude of 220-300 km, which is the typical altitude range of the OI 630.0 nm airglow emission. Also, ionosonde observations registered abrupt increases in both the F- layer peak height (hpF2) and base height (h'F) when the low intensity band passed over Cachoeira Paulista. During the period studied a strong seasonal variation was noticed in the TID. Also, it was observed that, during low solar activity, the TID occurrences were higher than during high solar activity. It should be pointed out that these thermospheric events are not related to geomagnetic disturbed conditions. Important features from this set of observations are presented and discussed in this paper.
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