Other
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa21b0065o&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SA21B-0065
Other
2400 Ionosphere, 2407 Auroral Ionosphere (2704), 2431 Ionosphere/Magnetosphere Interactions (2736), 2455 Particle Precipitation, 2467 Plasma Temperature And Density
Scientific paper
We focus on seasonal and solar activity dependences of the ion temperature in the polar ionosphere using data from several incoherent scatter-radars (ISR): the Sondrestrom ISR (67° N, 309° E, 74° magnetic latitude), the European Incoherent Scatter (EISCAT) UHF Tromsø radar (69° N, 19° E, 66° magnetic latitude), and the EISCAT Svalbard radar (ESR: 78° N, 16° E, 75° magnetic latitude). Since these radars are located at different magnetic latitudes, we can estimate the meridional structure of ion temperature from the statistical results calculated using long-term data sets. Below about 300 km, the energy transfer from neutrals to ions plays a significant role than that from electrons because the ion-neutral collision frequency is much higher than the ion-electron collision frequency for this height region. While studies of neutral temperature using the ion temperature data from ISRs have been conducted for more than two decades, the relationship between the ion and neutral temperatures is not well known at high latitudes because of recurrent joule energy dissipation. On the other hand, above 300 km the energy transfer from electrons through collisions becomes important with increasing heights. The statistical results from the EISCAT Tromsø radar data for about one solar cycle show that for summer the ion temperature in the upper F-region has higher values at local night than at local noon, and for other seasons daytime values are higher than night values. Statistical results for the ESR data show not only summer, but also some other seasons, show higher temperatures at local night than at local noon in this height region. In the case of the Sondrestrom radar data, the ion temperatures at summer night are also higher than the daytime values. These characteristics are not in agreement with standard model profiles of the ion temperature. The different characteristics suggest that the ion temperature climate in the polar ionosphere should have the meridional structure, which might be associated with the auroral oval. We will show these differences as well as other climate of the ion temperature in more detail in the presentation.
Lathuillere Ch.
Maeda Satoshi
Oyama Satoshi
Watkins Brenton J.
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