Iterative inversion of global magnetospheric ion distributions using energetic neutral atom (ENA) images recorded by the NUADU/TC2 instrument
Iterative inversion of global magnetospheric ion distributions using energetic neutral atom (ENA) images recorded by the NUADU/TC2 instrument
复制标题
DOI：
10.5194/angeo-26-1641-2008
复制
发表时间：
2008-06
影响因子：
1.9
通讯作者：
Li Lu;S. McKenna-Lawlor;S. Barabash;K. Kudela;J. Balaz;I. Strhárský;Z. Liu;C. Shen;Jinbin Cao;P. Brandt;C. Tang;I. Dandouras
中科院分区：
文献类型：
--
作者：
Li Lu;S. McKenna-Lawlor;S. Barabash;K. Kudela;J. Balaz;I. Strhárský;Z. Liu;C. Shen;Jinbin Cao;P. Brandt;C. Tang;I. Dandouras
A method has been developed for extracting mag- netospheric ion distributions from Energetic Neutral Atom (ENA) measurements made by the NUADU instrument on the TC-2 spacecraft. Based on a constrained linear inversion, this iterative technique is suitable for use in the case of an ENA image measurement, featuring a sharply peaked spa- tial distribution. The method allows for magnetospheric ion distributions to be extracted from a low-count ENA image recorded over a short integration time (5 min). The technique is demonstrated through its application to a set of representa- tive ENA images recorded in energy Channel 2 (hydrogen: 50-81 keV, oxygen: 138-185 keV) of the NUADU instru- ment during a geomagnetic storm. It is demonstrated that this inversion method provides a useful tool for extracting ion distribution information from ENA data that are charac- terized by high temporal and spatial resolution. The recov- ered ENA images obtained from inverted ion fluxes match most effectively the measurements made at maximum ENA intensity.
