Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa32a0667m&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA32A-0667
Physics
6028 Ionospheres: Structure And Dynamics
Scientific paper
Korea has launched its first multi-purpose satellite, KOMPSAT-1, on December 21, 1999 into 685 km altitude sun-synchronous polar orbit with the descending node at 22:50 local time. Ionospheric Measurement Sensor (IMS) composed of a Langmuir Probe (LP) and the Electron Temperature Probe (ETP) was developed and monitored the variation of the nighttime local ionosphere along the satellite track until August 2, 2001. IMS was able to measure the electron density and temperature variation during the progress of the Bastile event storm on July 15, 2000. A deep and extensive trough of the electron density developed in the magnetic equatorial region. The trough region extended over 2500 km along the satellite pass. Also at the southern boundary of the trough, the satellite encountered several sharp and small scale electron density depletions. These depletions were accompanied by strong irregularities in the electron temperature. The electron temperature was also seen highly disturbed during this period. It was enhanced in the low latitude region and increased rather sharply at higher latitudes. The data shows an extreme contraction of the plasmasphere during the main phase of the magnetic storm. We analyze the extensive measurement of the nighttime ionosphere done by KOMPSAT-1 for more than a year. Preliminary result shows that the quiet time KOMPSAT-1 electron density reasonably follows the IRI model in the low latitude region, while the temperature is higher than the IRI. The density enhancement and the depression of the temperature are more localized along the geomagnetic equator than the IRI model.
Lee En-Sang
Lee Julian
Min Kyoung-Wook
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