The Quasi-periodic Occurrence of Solar Radio Bursts, Auroral Kilometric Radiation, and Other Plasma Wave Phenomena Observed by the GEOTAIL Plasma Wave Investigation

Details The Quasi-periodic Occurrence of Solar Radio Bursts, Auroral Kilometric Radiation, and Other Plasma Wave Phenomena Observed by the GEOTAIL Plasma Wave Investigation The Quasi-periodic Occurrence of Solar Radio Bursts, Auroral Kilometric Radiation, and Other Plasma Wave Phenomena Observed by the GEOTAIL Plasma Wave Investigation

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsm33a..04a&link_type=abstract

American Geophysical Union, Spring Meeting 2004, abstract #SM33A-04

Other

2159 Plasma Waves And Turbulence, 2164 Solar Wind Plasma, 2772 Plasma Waves And Instabilities, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms

Scientific paper

Type III solar radio bursts and auroral kilometric radiation (AKR) are among the most common phenomena observed by the GEOTAIL Plasma Wave Investigation in more than eleven years of operation. The occurrence of Type III bursts, generated in the solar wind by energetic electrons ejected from the sun by solar flares, varies from less than one per day to nearly continuous. When the bursts appear "periodic", the periods typically range from several hours to a few minutes. During solar maximum, some Type III "storms" occurred with bursts every second. Some of the "periodic" Type III bursts had lower cutoff frequencies that progressively dropped in successive bursts. The frequency of occurrence of the bursts is determined by processes at the sun. The change in emission frequencies is determined by the solar wind plasma density distribution. The detection of AKR is affected by the observing location. When GEOTAIL is on the night side of the Earth, the AKR observations are closely related to geomagnetic substorms. The onsets of strong AKR bursts are nearly simultaneous with substorm onsets. Although triggers of substorm onsets such as changes in the magnetic field direction or increases in the ram pressure can often be found in the solar wind, many times we observe AKR bursts with no apparent solar wind trigger for many hours. These bursts may be quasi-periodic with periods of tens of minutes to several hours, or sometimes they appear to occur randomly. Near perigee, GEOTAIL often detects electromagnetic chorus and electrostatic electron cyclotron harmonic waves. At times quasi-periodic episodes of one, the other, or both, are observed indicating periodic movement or structure of the magnetopause. The implications of the various observations to the coupling processes will be examined.

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