2381/18359
Stephen E. Milan
Stephen E.
Milan
Tim K. Yeoman
Tim K.
Yeoman
Mark Lester
Mark
Lester
J. Moen
J.
Moen
P. E. Sandholt
P. E.
Sandholt
Post-noon two-minute period pulsating aurora and their relationship to the dayside convection pattern
University of Leicester
2012
Science & Technology
Physical Sciences
Astronomy & Astrophysics
Geosciences
Multidisciplinary
Meteorology & Atmospheric Sciences
Geology
magnetospheric physics (auroral phenomena
magnetopause
cusp
and boundary layers
MHD waves and instabilities)
LATITUDE BOUNDARY-LAYER
HF RADAR OBSERVATIONS
FLUX-TRANSFER EVENTS
HYDROMAGNETIC-WAVES
ALFVEN WAVES
FIELD LINES
CUSP
SIGNATURES
PRECIPITATION
FORMS
2012-10-24 09:05:04
Journal contribution
https://figshare.le.ac.uk/articles/journal_contribution/Post-noon_two-minute_period_pulsating_aurora_and_their_relationship_to_the_dayside_convection_pattern/10113740
Poleward-moving auroral forms, as observed by meridian-scanning photometers, in the vicinity of the cusp region are generally assumed to be the optical signature of flux transfer events. Another class of quasi-continuous, short period (1-2 min) wave-like auroral emission has been identified, closely co-located with the convection reversal boundary in the post-noon sector, which is similar in appearance to such cusp aurora. It is suggested that these short period wave-like auroral emissions, the optical signature of boundary plasma sheet precipitation in the region 1 field-aligned current system, are associated with ULF magnetohydrodynamic wave activity, which is observed simultaneously by ground magnetometer stations. This association with ULF wave activity is strengthened by the observation of several harmonic frequencies in the pulsation spectrum, each an overtone of the fundamental standing wave resonance frequency.