Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm42a..01t&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SM42A-01
Physics
2487 Wave Propagation (6934), 2752 Mhd Waves And Instabilities, 2768 Plasmasphere, 2788 Storms And Substorms
Scientific paper
The spatial structure of Pi2 pulsations is studied using magnetospheric electric field measured by the CRRES spacecraft from August 1990 to September 1991. The electric field is a better quantity for detecting ULF waves than magnetic field because the dc part of the former is small even near the Earth. We use an automated computer method to define Pi2 events as the intervals that give high-coherence between the CRRES Ey (dawn-to-dusk electric field) and Kakioka H components in the Pi2 band (6-25 mHz). The Ey component represents the poloidal oscillation of the geomagnetic field lines when the spacecraft is near the noon-midnight meridian. Most Pi2 events occurred when CRRES was on the nightside, implying that the pulsations are related to substorms. Events that occurred when both CRRES and Kakioka were within 3 hours of midnight are used to examine the radial profile of the Pi2 electric field. We find that the phase of Ey (relative to Kakiok H) is constant at 90 degrees from L = 1.5 to L = 6. This means that the Pi2 pulsations are radially non-propagating waves within the local time sector under consideration, which is consistent with the plasmaspheric cavity-mode model of Pi2 pulsations. However, the amplitude of Ey (divided by Kakioka H) shows a considerable scatter, making it difficult to determine the location of the electric field antinode that is expected for the cavity mode.
Anderson Rachel
Hughes Jeffrey W.
Takahashi Keitaro
No associations
LandOfFree
Statistical Analysis of Electric Field Pi2 Pulsations Observed by CRRES 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 Statistical Analysis of Electric Field Pi2 Pulsations Observed by CRRES, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Statistical Analysis of Electric Field Pi2 Pulsations Observed by CRRES will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1725164