High latitude unstructured Pc1 emissions generated in the vicinity of the dayside auroral oval

Details High latitude unstructured Pc1 emissions generated in the vicinity of the dayside auroral oval High latitude unstructured Pc1 emissions generated in the vicinity of the dayside auroral oval

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39..709h&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 39, May 1991, p. 709-719. Research supported by Australian Research Council a

Computer Science

9

Auroral Zones, Dawn Chorus, Daytime, Diurnal Variations, Geomagnetic Micropulsations, Earth Magnetosphere, F 2 Region, Ion Cyclotron Radiation, Magnetohydrodynamic Waves, Spectrum Analysis

Scientific paper

Three months of ground-based recordings of high latitude dayside Pc1 magnetic variations at auroral oval stations Syowa (MLAT = 67 deg) and Mawson (MLAT = 70 deg) are compared. Dynamic spectra reveal that banded unstructured Pc1 emissions (0.2-0.4 Hz) may be separated into pre-noon and postnoon activity. Although the pre-noon activity is common at Mawson, its observation at Syowa is associated with low altitude cleft-like ions being present at lower than normal latitudes, i.e., 75 deg MLAT. These ions are determinined from DMSP satellite observations. The Pc1 emissions at both stations are interpreted as arising from ion cyclotron waves generated in the equatorial plasmatrough region. The dayside cleft is regarded as the free energy source of the pre-noon Pc1 activity by supplying the equatorial magnetosphere with ions. It is believed that the ion cyclotron waves enter the ionosphere within the auroral oval, poleward of Mawson and Syowa, and fast Alfven mode waves, which then arise, propagate to the stations in the F2-region ionospheric waveguide.

Affiliated with

Also associated with

No associations

Rating

High latitude unstructured Pc1 emissions generated in the vicinity of the dayside auroral oval 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 High latitude unstructured Pc1 emissions generated in the vicinity of the dayside auroral oval, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High latitude unstructured Pc1 emissions generated in the vicinity of the dayside auroral oval will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1039877