[P-EM09] Space Weather and Space Climate

[PEM09-17] Response of Thermospheric radiative emissions to the solar wind-magnetospheric energy deposition: Recent Advances

★Invited Papers

*Tikemani Bag¹ (1.National Institute of Polar Research, Tokyo, Japan)

Keywords:Space Weather, Energy deposition, Thermospheric radiative cooling emission

The process of solar wind-magnetosphere interaction affects the whole magnetosphere-ionosphere-thermosphere system enveloping the near-Earth space environment. This process deposits enormous amounts of energy into the magnetosphere that subsequently propagates within the ionosphere-thermosphere system. This energy deposition results in many local and global phenomena and brings substantial changes in the chemistry, dynamics and structure of the thermosphere. It also severely affects the space technology due to the significant increase in the thermospheric temperature. The thermospheric infrared radiative emissions by CO₂ 15 μm and Nitric Oxide 5.3 μm play important roles in regulating it. The magnitude of infrared radiative emission is directly related to the response of thermospheric density and composition to the solar energy deposition. In this talk, the formation of the radiative emissions, their response to the global energy deposition and importance for satellite drag and thermospheric density forecast will be discussed based on the recent observations. It will help us to understand a few critical aspects of the thermospheric radiative emissions during space weather events that has largely been ignored.