FAST observations of solar illumination and solar cycle dependence of the acceleration of upflowing and downflowing ion beams on auroral field lines

Details FAST observations of solar illumination and solar cycle dependence of the acceleration of upflowing and downflowing ion beams on auroral field lines FAST observations of solar illumination and solar cycle dependence of the acceleration of upflowing and downflowing ion beams on auroral field lines

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsm43a..04c&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SM43A-04

Mathematics

Probability

2451 Particle Acceleration, 2704 Auroral Phenomena (2407), 7845 Particle Acceleration, 7974 Solar Effects

Scientific paper

Many studies of in situ observations of accelerated electron and ion beams and remote sensing observations of auroral light have examined the impact of solar illumination and/or solar cycle on auroral acceleration processes. Using data from the FAST satellite, we examine the distribution of ion beams in magnetic local time, invariant latitude and altitude, and their dependence on whether the ionospheric footpoint of the satellite is illuminated or dark and on solar cycle. Consistent with previous studies, the occurrence of upflowing ion beams peaks in the pre-midnight local time sector and shows a strong solar illumination effect. The effect is similar to the suppression of upflowing electrons observed in the downward current region. In contrast, the occurrence probability of downflowing ions, which peaks post-midnight, is only weakly dependent on solar illumination. We will discuss comparisons between the electron and ion beam observations and the constraints the new observations place on the altitude of the parallel potential drop and on relative importance of ionospheric conductivity and plasma density on the acceleration processes.

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