Geotail Data Archive at NASA/GSFC

The GEOTAIL mission is a collaborative project undertaken by the Institute of
Space and Astronautical Science (ISAS) and the National Aeronautics and Space
Administration (NASA). Its primary objective is to study the dynamics of the
Earth's magnetotail over a wide range of distance, extending from the
near-Earth region (8 Earth radii (Re) from the Earth) to the distant tail
(about 200 Re). The GEOTAIL spacecraft was designed and built by ISAS and was
launched on July 24, 1992.

The Geotail mission measures global energy flow and transformation in the
magnetotail to increase understanding of fundamental magnetospheric processes.
This will include the physics of the magnetopause, the plasma sheet, and
reconnection and neutral line formation (i.e., the mechanisms of input,
transport, storage, release and conversion of energy in the magnetotail).

See:
http://pwg.gsfc.nasa.gov/istp/geotail/geotail_key_parameters.html
for a list of key parameters measured by the Geotail instruments.

GEOTAIL任务是由宇宙航空科学研究所（Institute of Space and Astronautical Science, ISAS）与美国国家航空航天局（National Aeronautics and Space Administration, NASA）联合开展的合作项目。其核心目标是对地球磁尾在大跨度距离区间内的动力学特性开展系统性研究，观测范围涵盖近地区域（距地球8个地球半径（Re））至远磁尾区域（约200 Re）。GEOTAIL探测器由ISAS设计制造，于1992年7月24日发射升空。

本任务通过探测磁尾的全球能量流动与转化过程，以加深对基础磁层物理过程的理解。研究内容将涵盖磁层顶（magnetopause）、等离子体片（plasma sheet）的物理机制，以及磁重联（reconnection）与中性线形成过程——即磁尾中能量的输入、输运、存储、释放与转化机制。

欲了解GEOTAIL探测仪器所测量的关键参数列表，请参见：http://pwg.gsfc.nasa.gov/istp/geotail/geotail_key_parameters.html