On the use of longitude sector indices to characterize WINDII thermospheric temperatures measurements during magnetically active conditions.

Details On the use of longitude sector indices to characterize WINDII thermospheric temperatures measurements during magnetically active conditions. On the use of longitude sector indices to characterize WINDII thermospheric temperatures measurements during magnetically active conditions.

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....11888l&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #11888

Computer Science

Scientific paper

Increased high latitude convection electric fields and particle precipitation during magnetically active conditions result in global disturbances of the thermosphere that may have large impacts on satellite and debris orbitography. Since the end of 1991, the Earth' s upper atmosphere winds and temperatures are observed by the Wind Imaging Interferometer (WINDII) onboard the Upper Atmosphere Research Satellite (UARS). Thermospheric temperatures measured during magnetically quiet days have been compared to temperatures obtained by the MSIS-90 empirical model, as well as the DTM-94 model, which is routinely used in Europe for the calculation of the drag force on LEO satellites. We have found that the modeled temperature variations represent very well the mean temperature variation observed by WINDII over 4 years, as well as the observed latitudinal/local time variation. However the temperature variations during magnetically disturbed days are found to be largely underestimated by these models which are based on the use of the planetary magnetic activity Ap or Kp indices. Planetary magnetic activity indices are derived using K indices measured at networks of geomagnetic observatories. They monitor the average level of the geomagnetic activity at the planetary scale, and therefore do not allow to take into account the LT dependence of geomagnetic activity. The am planetary magnetic indices are derived using K from observatories evenly distributed in longitude in both hemisphere. This network makes it possible to derive longitude sector activity indices, al. These indices are routinely derived and provided by the International Service of Geomagnetic Indices hosted by the CETP in Paris (http://www.cetp.ipsl.fr/~isgi/homepag1.htm). In the present study, we use these longitudinal sector indices to characterize the temperature variations at all latitudes during several disturbed days.

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