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.