Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm21b..06g&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM21B-06
Physics
2772 Plasma Waves And Instabilities, 7867 Wave/Particle Interactions
Scientific paper
An overview is given of results from the Cluster wideband plasma wave investigation after one year of inflight operation. The primary objective of this investigation is to provide very high resolution multi-baseline measurements of the waveform of magnetospheric radio and plasma emissions. Topics studied include: auroral kilometric radiation, whistler-mode chorus emissions, auroral hiss, and lightning-generated whistlers. By using the microsecond timing accuracy available from the NASA deep space receiving stations, for the first time we have been able to use multi-spacecraft long baseline interferometry techniques to determine the source location of auroral kilometric radiation. In one case where simultaneous ultraviolet auroral images were available from the Polar spacecraft (courtesy of G. Parks), we have been able to show that the auroral kilometric radiation source lies on the same magnetic field line as a bright feature in the aurora. Timing measurements of whistler-mode chorus measurements show that these emissions are generated within a few degrees of the magnetic equator, thereby confirming previous results obtained from Poynting flux measurements with the Polar spacecraft. The frequency of individual chorus elements is sometimes observed to shift significantly as the wave packet propagates past the different spacecraft. These frequency shifts may be due to a nonlinear frequency evolution, as has been suggested by some theories. The upper cutoff frequency of auroral hiss has also been used to make very high time resolution measurements of the electron density in the auroral region and polar cap. These electron density measurements often show large differences over the typically several hundred kilometer separation distances between the spacecraft. Comparisons of whistler signals received by the different spacecraft also show significant differences is detailed characteristics over spatial scales of several hundred kilometers.
Alleyne Hugo
Bougeret J-J.
Canu Paolo
Christopher Ian
Gurnett Donald
No associations
LandOfFree
An Overview of Results from the Cluster Wideband Plasma Wave Investigation 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 An Overview of Results from the Cluster Wideband Plasma Wave Investigation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An Overview of Results from the Cluster Wideband Plasma Wave Investigation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1383245