|
DEMETER (Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions) is a French micro-satellite operated by CNES devoted to the investigation of the ionospheric disturbances due to seismic and volcanic activity. It was launched on June 29, 2004 on a quasi Sun-synchronous circular orbit with an inclination of about 98.23° and an altitude of about 710 km. The altitude was changed to about 660 km in December, 2005. Due to the specific orbit, DEMETER is always located either shortly before the local noon (10:30 local time) or local midnight (22:30 local time). The satellite performs 14 orbits per day and measures continuously between -65° and +65° of invariant latitude.〔Lagoutte et al. "The DEMETER Science Mission Centre". Planetary and Space Science 54 (2006) 428-440.〕 DEMETER observed an increase in ultra low frequency radio waves in the month before the 2010 Haiti earthquake. During the 2010 eruption of Mount Merapi, DEMETER noted anomalies in the ionosphere. Scientific operations ended December 9th, 2010. ==Scientific Objectives== * to study the ionospheric disturbances in relation to the seismic activity and to examine the pre- and post-seismic effects * to study the ionospheric disturbances in relation to the volcano activity * to survey the ionospheric disturbances in relation to the anthropogenic activity * to contribute to the understanding of the generation mechanism of these disturbances * to give a global information on the Earth's electromagnetic environment 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Demeter (satellite)」の詳細全文を読む スポンサード リンク
|