Two-dimensional structure of long-period pulsations at polar latitudes in Antarctica

Details Two-dimensional structure of long-period pulsations at polar latitudes in Antarctica Two-dimensional structure of long-period pulsations at polar latitudes in Antarctica

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgra..10903222y&link_type=abstract

Journal of Geophysical Research, Volume 109, Issue A3, CiteID A03222

Physics

7

Magnetospheric Physics: Polar Cap Phenomena, Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers

Scientific paper

Two-dimensional (2-D) statistical distributions of spectral power and coherence of polar geomagnetic variations with quasi-periods about 10 min are analyzed using data from magnetometer arrays in Antarctica. Examination of the 2-D patterns of spectral power and coherence shows the occurrence of significant variations in geomagnetic power levels but with low spatial coherence near the cusp projection and in the auroral region. At the same time, low-amplitude pulsations, which we coin Picap3 pulsations, are very coherent throughout the polar cap. The region occupied by coherent Picap3 pulsations is shifted toward local MLT night from the geomagnetic pole and is decoupled from the regions of auroral and cusp ULF activity. The spectral power varies with time at polar latitudes in a manner different from that at auroral latitudes. Diurnal variations of power at different stations at the same geomagnetic latitude exhibit different behavior depending on the station's position relative to geomagnetic and geographic poles. This asymmetry is shown to be partly attributed to the variations of the ionospheric conductance. The primary source of polar pulsations is probably related to intermittent magnetosheath turbulence and tail lobe oscillations, though a particular propagation mechanism has not as yet been identified.

Affiliated with

Also associated with

No associations

Rating

Two-dimensional structure of long-period pulsations at polar latitudes in Antarctica 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 Two-dimensional structure of long-period pulsations at polar latitudes in Antarctica, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two-dimensional structure of long-period pulsations at polar latitudes in Antarctica will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1134987