On the origin of the high-altitude electric field fluctuations in the auroral zone

Details On the origin of the high-altitude electric field fluctuations in the auroral zone On the origin of the high-altitude electric field fluctuations in the auroral zone

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...10127157a&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue A12, p. 27157-27170

Physics

14

Magnetospheric Physics: Electric Fields, Ionosphere: Particle Acceleration, Magnetospheric Physics: Mhd Waves And Instabilities

Scientific paper

Intense fluctuations in the electric field at high altitudes in the auroral zone are frequently measured by the Viking satellite. We have made an analysis of the origin of electric and magnetic fluctuations in the frequency range of 0.1-1 Hz by assuming four different sources for the signals: (1) spatial structures, (2) spatial structures with a parallel potential drop below the satellite, (3) traveling shear Alfvén waves, and (4) interfering shear Alfvén waves. We will show that these different sources of the signals may produce similar amplitude ratios and phase differences between the perpendicular electric and magnetic fields. Since the different sources have different frequency dependencies, this can be used as an additional test if the signals are broadband. In other cases, additional information is needed, for example, satellite particle measurements or ground magnetic measurements. The ideas presented in the theory were tested for one Viking eveningside pass over Scandinavia, where ground-based magnetometer and EISCAT radar measurements were available. The magnetic conditions were active during this pass and several interfering shear Alfvén waves were found. Also, a spatial structure with a parallel potential drop below the satellite was identified. The magnitude of the 10-km-wide potential drop was at least 2 kV and the upward field-aligned current 26μAm-2 (value mapped to the ionospheric level). The field-aligned conductance was estimated as 1.3-2.2×10-8Sm-2.

Affiliated with

Also associated with

No associations

Rating

On the origin of the high-altitude electric field fluctuations in the auroral zone 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 On the origin of the high-altitude electric field fluctuations in the auroral zone, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the origin of the high-altitude electric field fluctuations in the auroral zone will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1502835