Open AccessViewing perspective in energetic neutral atom intensity
Author(s) -
Zheng Yihua,
Lui Anthony T. Y.,
Fok MeiChing
Publication year - 2008
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2008ja013070
Subject(s) - intensity (physics) , ring current , physics , energetic neutral atom , perspective (graphical) , viewing angle , pitch angle , ion , flux (metallurgy) , anisotropy , atomic physics , spacecraft , computational physics , magnetosphere , optics , plasma , geometry , geophysics , materials science , astronomy , nuclear physics , quantum mechanics , mathematics , liquid crystal display , metallurgy
Through interspacecraft comparison of energetic neutral oxygen (ENO) intensity from two different vantage points provided by IMAGE and Geotail, Lui et al. (2005) showed that viewing perspective plays a very important role in the observed ENO intensity level during a magnetic storm period. Motivated by the findings of Lui et al. (2005), we investigate how viewing perspective influences energetic neutral atom emissions from a modeling perspective. The main results of this paper are that (1) our simulation results, based upon O + ion fluxes from the Comprehensive Ring Current Model and the subsequent ENO calculation, reproduce the total differential ENO intensity obtained from two spacecraft to a reasonable degree and (2) further analysis of our results indicates that pitch angle anisotropy in ring current ion flux, a crucial physical quantity in ring current dynamics, is one major contributor to the difference in energetic neutral atom intensity from different viewing perspectives.