Comparative study of the high-latitude E region ion and neutral temperatures in the polar cap and the auroral region derived from the EISCAT radar observations

Details Comparative study of the high-latitude E region ion and neutral temperatures in the polar cap and the auroral region derived from the EISCAT radar observations Comparative study of the high-latitude E region ion and neutral temperatures in the polar cap and the auroral region derived from the EISCAT radar observations

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jgra..11008301m&link_type=abstract

Journal of Geophysical Research, Volume 110, Issue A8, CiteID A08301

Physics

2

Atmospheric Composition And Structure: Thermosphere: Energy Deposition (3369), Ionosphere: Ionosphere/Atmosphere Interactions (0335), Ionosphere: Polar Cap Ionosphere, Ionosphere: Auroral Ionosphere (2704)

Scientific paper

The ion and neutral temperatures in the auroral region have been compared with those in the polar cap based upon simultaneous measurements with the EISCAT-UHF radar at Tromsø and the EISCAT Svalbard radar (ESR) at Longyearbyen from March 8 to 12 in 1999. The E region ion temperature at Tromsø does not show any characteristic difference between dayside and nightside except for a tendency to increase slightly during the nights. At Longyearbyen, however, the E region ion temperature shows the opposite sense of the day-night asymmetry, i.e., being higher in the dayside than in the nightside. The day-night asymmetry of the neutral temperature estimated from the measured ion temperature has the same feature as the day-night asymmetry of the ion temperature. The dayside E region neutral temperature at Longyearbyen is higher than that at Tromsø, particularly at and above 110 km. The difference between them increases with increasing altitude. The E region neutral temperatures derived from the two EISCAT radars have been compared with the temperature predicted by the mass spectrometer/incoherent scatter (MSISE-90) model. The dayside neutral temperature at Tromsø is consistent to the MSIS temperature. In contrast, the dayside E region neutral temperature at Longyearbyen is significantly higher than the MSISE-90 model temperature. Energetics which account for the distributions of the ion and neutral temperatures are also discussed.

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