Observations of large-scale traveling ionospheric disturbances using GPS networks

Details Observations of large-scale traveling ionospheric disturbances using GPS networks Observations of large-scale traveling ionospheric disturbances using GPS networks

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa12b0689t&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA12B-0689

Other

2400 Ionosphere, 2427 Ionosphere/Atmosphere Interactions (0335), 2435 Ionospheric Disturbances, 2443 Midlatitude Ionosphere, 2487 Wave Propagation (6934)

Scientific paper

~~~The generation and propagation mechanisms of large-scale traveling ionospheric disturbances (LSTIDs) were studied using the total electron content (TEC) data derived from GPS earth observation network (GEONET), international GPS service (IGS), and Continuously Operating Reference Stations (CORS). A dense and wide-area GPS network in Japan, GEONET, has about 1,000 GPS receivers and provides GPS data every 30 seconds. With GEONET, it is possible to reveal spatial structures and temporal variations of LSTIDs in detail over Japan. The GPS data of the global network, IGS, and a regional network, CORS, enable to clarify the global-scale characteristics of the propagation. ~~~In this study, LSTIDs during a large geomagnetic storm on September 22, 1999 were investigated in detail. Two LSTIDs were seen to travel southward in the dawn region from 0730 to 0900 LT (from 2230 to 2400 UT) and were dissipated as they traveled over Japan. Their damping rates were larger at mid latitudes than at high latitudes. In the afternoon region, several LSTIDs were observed around 1300 LT (2100 UT) and their damping rate is higher than that in the dawn region. LSTIDs were observed in these two regions. No LSTID was, however, detected in the night region, despite the geomagnetic activities in the auroral night region were very large. ~~~The dissipation of the LSTIDs was more intense at lower latitudes and in the afternoon region than at higher latitudes and in the dawn region. In the regions where the LSTIDs were rapidly damped, the values of background TEC found to be larger than those in the other regions. This feature indicates that the intense dissipation is caused by the ion drag effect that is proportional to the background TEC. It is also noted that the LSTIDs were not always generated when the geomagnetic activities are large in the auroral region. We believe that the other ionospheric conditions also contributes to the generation of the LSTIDs. >http://www-step.kugi.kyoto- u.ac.jp/~tsug/study/study_e.html

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