Pc3-4 geomagnetic pulsations at very low latitude in Brazil

Details Pc3-4 geomagnetic pulsations at very low latitude in Brazil Pc3-4 geomagnetic pulsations at very low latitude in Brazil

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004p%26ss...52.1209z&link_type=abstract

Planetary and Space Science, Volume 52, Issue 13, p. 1209-1215.

Computer Science

Scientific paper

In order to investigate Pc3-4 geomagnetic pulsations at very low and equatorial latitudes, L=1.0 to 1.2, we analyzed simultaneous geomagnetic data from Brazilian stations for 26 days during October November 1994. The multitaper spectral method based on Fourier transform and singular value decomposition was used to obtain pulsation power spectra, polarization parameters and phase. Eighty-one (81) simultaneous highly polarized Pc3-4 events occurring mainly during daytime were selected for the study. The diurnal events showed enhancement in the polarized power density of about 3.2 times for pulsations observed at stations close to the magnetic equator in comparison to the more distant ones. The phase of pulsation observed at stations near the magnetic equator showed a delay of 48 62° in relation to the most distant one. The peculiarities shown by these Pc3-4 pulsations close to the dip equator are attributed to the increase of the ionospheric conductivity and the intensification of the equatorial electrojet during daytime that regulates the propagation of compressional waves generated in the foreshock region and transmitted to the magnetosphere and ionosphere at low latitudes. The source mechanism of these compressional Pc3-4 modes may be the compressional global mode or the trapped fast mode in the plasmasphere driving forced field line oscillations at very low and equatorial latitudes.

Affiliated with

Also associated with

No associations

Rating

Pc3-4 geomagnetic pulsations at very low latitude in Brazil does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Pc3-4 geomagnetic pulsations at very low latitude in Brazil, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pc3-4 geomagnetic pulsations at very low latitude in Brazil will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1056083