Occurrence characterisitcs of plasma bubble derived from global GPS-TEC data

Details Occurrence characterisitcs of plasma bubble derived from global GPS-TEC data Occurrence characterisitcs of plasma bubble derived from global GPS-TEC data

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa33b0284n&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA33B-0284

Physics

2415 Equatorial Ionosphere, 2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities

Scientific paper

Occurrence characteristics of plasma bubble were studied using GPS total electron content (TEC) data. GPS data used in this study is provided by International GNSS Service, Scripps Orbit and Permanent Array Center, and Japan Agency for Marine-Earth Science and Technology. The reveivers of these networks cover all longitudinal sectors and provide TEC data every 30 seconds. TEC fluctuates very sharply when plasma bubble appears. Plasma bubble can be identified using the TEC data. Therefore the global picture of plasma bubble occurrence can be investigated for every day. In this presentation, (1) temporal variability of plasma bubble occurrence and (2) zonal distribution of plasma bubble will be discussed. As for (1), we studied yearly, monthly, several days and day-to-day variabilities. Occurrence rate of plasma bubble was derived for five regions which were defined according to the longitude and the geomagnetic declination angle; the Asian, Central Pacific, Eastern Pasific, Atlantic and African region. The magnetic declination angle is one of the parameter that controls plasma bubble occurrence. The yearly variabilitiy was large in the Asian and African regions. Their occurrence rates in 2003 and 2004 were 20% lower than that of 2000 and 2001. The monthly variability were also different among the regions. In the Asian region, the maxima of plasma bubble occurrence appeared at equinoxes when the geomagnetic field line and the sunset terminator were almost parallel. In the African region, however, the spring maximum appeared later than the vernal equinox and the autumn maximum appeared earlier than the autumnal equinox. In the Eastern Pasific region, the spring maximum came earlier than the vernal equinox and the autumn maximum delayed from the autumnal equinox. The regional dependence would be caused by the strength of the geomagnetic field and the conductivity in the F-region. (2) zonal distribution of plasma bubble was investigated in detail between 60E° and 150E°. In this area, plasma bubbles occurred in 201 days in 2004. The typical zonal scale of one plasma bubble is 100-300km, and many occasions several plasma bubbles appeared as a cluster. The zonal structure of plasma bubble is also studied using the Equatorial Atomsphere Radar (EAR), which is installed in West Sumatra and can obtain spatial maps of the field aligned irregularity by scanning the radar beam rapidly. Zonal structures observed by EAR was consistent with those observed by the GPS networks. The most typical size of clusters observed by the GPS networks was about 500km and it was observed in 86 days. Clusters whose scale sizes were longer than 1000km were found in 77 days. Intervals between clusters were 300km-3000km. The zonal distributions of plasma bubble occurrences reflect the spatial structure of the electric field in the ionosphere or atmospheric activities in the lower atmosphere.

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