Multiple, discrete arcs on sunward convecting field lines in the 14-15 MLT region

Details Multiple, discrete arcs on sunward convecting field lines in the 14-15 MLT region Multiple, discrete arcs on sunward convecting field lines in the 14-15 MLT region

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99.6113m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A4, p. 6113-6123

Physics

Geophysics

27

Auroral Arcs, Convective Flow, Field Aligned Currents, Interplanetary Magnetic Fields, Magnetohydrodynamic Flow, Magnetosheath, Solar Wind, Daytime, Geophysics, Kelvin-Helmholtz Instability, Particle Acceleration, Planetary Boundary Layer, Solar Terrestrial Interactions, Wave Interaction

Scientific paper

Ionospheric plasma flow measurements and simultaneous observations of thin (approximately 0.2 deg invariant latitude (ILAT)), multiple, longitudinally extended auroral arcs of transient nature within 74 to 76 degs ILAT and 1030 to 1130 UT (approximately 14 to 15 MLT) on January 12, 1989, are reported. The auroral structures appeared within the luminous belt of strong 630.0-nm emissions located predominantly on sunward convecting field lines equatorward of the convection reversal boundary as identified by the Eurpoean Incoherent Scatter UHF radar. The events occured during a period of several hours quasi-steady solar wind speed (approximately 700 km/s) and a radially orientated interplanetary magnetic field (IMF) with a weak northward tilt (IMF B(sub z) greater than zero). These typical dayside auroral features are related to previous studies of auroral activity related to the upward region 1 current in the postnoon sector. The discrete auroral events presented here may result from magnetosheath plasma injections into the low-latitude boundary layer (LLBL) and an associated dynamo mechanism. An alternative explanation invokes kinetic Alfven waves, triggered either by Kelvin-Helmholtz instability at the inner (or outer) edge of the LLBL or by pressure pulse induced magnetopause surface waves.

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