Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa52c04o&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SA52C-04
Physics
2435 Ionospheric Disturbances, 2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities, 2443 Midlatitude Ionosphere, 6969 Remote Sensing
Scientific paper
The Geographical Survey Institute of Japan has installed a network of more than 1000 dual-frequency GPS receivers in Japan. Global Positioning System (GPS) is used to measure total electron content (TEC) along ray path. Phase fluctuation, which is defined as the rate of change of TEC, is examined to study the ionospheric irregularities. The dense distribution of the GPS receivers provides two-dimensional maps of the ionospheric irregularity with high time and spatial resolutions. The irregularities were observed in two regions, middle and northern parts of Japan on the night of February 12, 2000 during a geomagnetic storm. At the northern edge of Japan, the irregularity region which was stretching from northwest to southeast, propagated to the southwest direction in about 70 m/s. This region corresponded to TEC enhancement produced by a traveling ionospheric disturbance. In the middle of Japan, irregularity appeared at 2030 JST, when the background TEC rapidly decreased accompanying steep latitudinal gradient of TEC. These facts suggest that the spatial gradient of the electron density play an important role to generate the ionospheric irregularities.
Ogawa Takuro
Otsuka Yoichi
Sahai Yogeshwar
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