Computer Science – Sound
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jatp...37..973w&link_type=abstract
(IAU, IUGG, URSI, IUPAP, COSPAR, and SCOSTEP, International Solar-Terrestrial Physics Symposium, 4th, Sao Paulo, Brazil, June 17
Computer Science
Sound
1
Auroral Electrojets, Infrasonic Frequencies, Ionospheric Sounding, Polar Substorms, Radar Measurement, Wave Generation, Auroral Arcs, E Region, Incoherent Scattering, Magnetic Disturbances
Scientific paper
A comparison of the characteristics of auroral infrasonic waves (AIW) in the passband over time periods of from 10 to 100 sec is given for trans-auroral zone stations. The morphology of 2-Hz auroral infrasound observed at Kiruna, Sweden, is described. An important asymmetry in the generation of AIW bow waves with respect to poleward or equatorward motion of auroral electrojet arcs is shown to be related to the morphology of the ionospheric E-region electric field during an auroral substorm. Incoherent-scatter radar observations of electron density profiles of auroral arcs are used to describe the differences in arcs that do or do not produce AIW in an attempt to explain the asymmetry in AIW generation by supersonic arcs. An infinite line-current induction model of an auroral electrojet moving transverse to its axis above a conducting earth is used to determine the relationship of an AIW to the surface magnetic perturbation produced by the electrojet. The role of the electrojet in AIW production is discussed in a study of polar magnetic substorms wherein westward traveling auroral surges and the eastern ends of westward electrojets were found to be strong sources of AIW. Lorentz force and Joule heat are discussed as probable source terms for the production of the acoustic energy within an electrojet.
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