a satellite study of dayside auroral conjugacy
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ID: 229159
1995
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Abstract
A study of dayside auroral conjugacy has been
done using the cleft/boundary layer auroral particle boundaries observed by the
DMSP-F7 satellite in the southern hemisphere and the global UV auroral images
taken by the Viking spacecraft in the northern hemisphere. The 22 events have
been studied on the basis of an internal IGRF 1985 magnetic field; it is shown
that there is a displacement of up to 4° in latitude from the
conjugate points with the northern aurora appearing to be located poleward of
the conjugate point. No local time dependence of the north-south auroral
location difference was seen. The use of a more realistic magnetic field model
for tracing field lines which incorporates the dipole tilt angle and Kp
index, the Tsyganenko 1987 long model plus the IGRF 1985 internal magnetic field
model, appears to organize the data better. Although with this external plus
internal model some tracings did not close in the opposite hemisphere, 70% of
those that did indicated satisfactory conjugacy. The study shows that the degree
of auroral conjugacy is dependent upon the accuracy of the magnetic field model
used to trace to the conjugate point, especially in the dayside region where the
field lines can either go to the dayside magnetopause near the subsolar point or
sweep all the way back to the flanks of the magnetotail. Also the discrepancy in
the latitude of northern and southern aurora can be partially explained by the
displacement of the neutral sheet (source region of the aurora) by the dipole
tilt effect.
| Reference Key |
vo1995annalesa
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|---|---|
| Authors | ;H. B. Vo;J. S. Murphree;D. Hearn;P. T. Newell;C.-I. Meng |
| Journal | journal of food measurement and characterization |
| Year | 1995 |
| DOI |
10.1007/s00585-995-1134-4
|
| URL | |
| Keywords |
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