VHF radar studies of the equatorial electrojet 3-m irregularities over São Luís: day-to-day variabilities under auroral activity and quiet conditions

Details VHF radar studies of the equatorial electrojet 3-m irregularities over São Luís: day-to-day variabilities under auroral activity and quiet conditions VHF radar studies of the equatorial electrojet 3-m irregularities over São Luís: day-to-day variabilities under auroral activity and quiet conditions

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jastp..66.1603d&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 66, Issue 17, p. 1603-1613.

Physics

2

Scientific paper

We have analyzed the data collected during an observational campaign of the equatorial electrojet (EEJ) plasma irregularities using 50 MHz coherent back-scatter radar operated at São Luís, Brazil. The 7-day campaign were characterized by a disturbed 3-day period in the beginning followed by `quiet' days. A correlative analysis of the auroral electrojet (AE) indices and radar and magnetometer data are carried out to investigate the diverse characteristics of the responses of the EEJ and its instabilities processes to the disturbance zonal electric fields that penetrate to equatorial latitudes during auroral disturbance. Large degrees of day-to-day variability in the EEJ current intensity, 3-m echo powers and spectral features were observed even under absence of any auroral disturbances. Among the outstanding results of this analysis are the following findings: (a) the observed EEJ current and 3-m irregularity response phases to the intensification/decay phases of an auroral sub-storm event agree with the prediction by the existing models; (b) the phase relationship of the EEJ response versus AE intensification is altered/inverted under the presence of a ring current (Dst) development; (c) the amplitude of the EEJ response show clear local time dependence being maximum around noon; and (d) significant increase in the type-1 (two-stream wave) Doppler velocity exceeding the nominal ion-acoustic speed is observed under magnetically disturbed conditions. These results are presented and discussed.

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