Other
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa43c..01s&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA43C-01
Other
2415 Equatorial Ionosphere, 2427 Ionosphere/Atmosphere Interactions (0335), 2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities
Scientific paper
Solar variability effect in the instability suppression agent of transequatorial meridional wind has been noted in the seasonal/longitudinal (s/l) distribution of equatorial density irregularity observed by ROCSAT-1 during the years 2000 and 2003. The monthly solar activity was higher every month in the year 2000 than in 2003, but the irregularity occurrence rate did not always correlate with the solar activity at every longitude in a season. For the equinox seasons, the occurrence rate was higher at every longitude in 2000 than in 2003. Higher occurrence rate was also observed in 2000 than in 2003 at the so-called equatorial spread F (ESF) longitudes where the sunset terminator makes a good alignment with the magnetic flux tube in a solstice season. On the other hand, opposite results of higher occurrence rate in 2003 were observed at the so-called low ESF occurrence longitudes from 230° to 360° during the June solstice and from 90° to 260° during the December solstice, where large-angle alignment between the sunset terminator and the magnetic flux tube occurs. This implies that the instability suppression agent from the transequatorial meridional wind becomes relatively ineffective at longitudes of large magnetic declinations in a solstice season during low solar activity period. Furthermore, the longitudinal occurrence pattern of small peaks and valleys at these so-called low ESF occurrence longitudes could be related to the day-to-day variability of ESF occurrence due to seed perturbation. The distance between two adjacent minimum occurrences in longitudinal undulation pattern varies from 3000 to 5000 km or about 30° to 50° in longitude. Whether the peaks and valleys in the longitudinal distribution are caused by the way data is sampled or are truely related to the day-to-day variability of ESF occurrence will be discussed.
Chao Chia-Chun
Ho H. H.
Liu Chan Chiang
Su Shangguo
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