WINDII thermosphere temperature perturbation for magnetically active situations

Chantal Lathuillère (1) , Michel Menvielle (2)

1 LPG - Laboratoire de Planétologie de Grenoble
2 CETP - Centre d'étude des environnements terrestre et planétaires

Oxygen red line data obtained by the Wind Imaging Interferometer (WINDII) on board the Upper Atmosphere Research Satellite (UARS) between 1992 and 1995 are used to retrieve thermosphere temperature perturbation associated with magnetic activity. Using a statistical approach, we found maximum temperature perturbations of ~300 K at auroral latitudes. We show that the use of longitude sector magnetic indices allows a better characterization of the perturbation than the usual planetary indices. The magnetic activity dependence in the MSIS-90 and DTM94 empirical models is qualitatively in excellent agreement with our results. However, empirical temperature perturbations are underestimated by ~70%.

Mots clés: thermospheric temperature; magnetic activity; WINDII O(1 D) observations; longitudinal sector indices; thermosphere empirical models; thermosphere temperature response to magnetic activity

Domaines: Géophysique [physics.geo-ph]; Physique de l'espace [physics.space-ph]

Chantal Lathuillère, Michel Menvielle. WINDII thermosphere temperature perturbation for magnetically active situations. Journal of Geophysical Research Space Physics, 2004, 109 (A11), pp.A11304-A11311. ⟨10.1029/2004JA010526⟩. ⟨insu-00193279⟩