Excitation of VLF hiss by a laser-produced plasma-- a laboratory investigation

Details Excitation of VLF hiss by a laser-produced plasma-- a laboratory investigation Excitation of VLF hiss by a laser-produced plasma-- a laboratory investigation

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm21b0548v&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM21B-0548

Physics

0654 Plasmas, 2483 Wave/Particle Interactions, 2716 Energetic Particles, Precipitating, 6934 Ionospheric Propagation (2487)

Scientific paper

VLF hiss is an ionospheric radio emission which is closely related to electron precipitation in the earth's auroral zones. In this experiment, a burst of field-aligned electrons is produced by the expansion of a dense, laser-produced plasma (lpp) into a uniform, low-density background plasma. The experiment is conducted in the upgraded Large Plasma Device (LaPD) at UCLA. The background plasma is neon, with plasma parameters: ω ce}/ω {pe=0.1--0.3, Te}/T{i≈ 6, plasma radius=66rci, length=17m. An aluminum target is struck with a NdYAG laser (1J, 7ns pulse) focused to a spot size of less than one millimeter. The ions in the lpp (with energies of several keV) are initially unmagnetized and propagate across the background field. The electrons, however, remain magnetized and a fraction of them jet away from the point source of the laser impact in a field-aligned burst, perhaps forming a beam-like distribution similar to auroral electrons. The measured electric field spectra (ω LH}<ω <ω {ce) as a function of angle are consistent with a finite line source of lower hybrid waves, with one end fixed at the laser impact site. The spatial morphology of the observed radiation pattern is similar to auroral zone VLF hiss. We present these spectra, correlation measurements, and an estimate of the coupling efficiency of laser power into wave energy. Work supported by ONR, DOE, and NSF.

Affiliated with

Also associated with

No associations

Rating

Excitation of VLF hiss by a laser-produced plasma-- a laboratory 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 Excitation of VLF hiss by a laser-produced plasma-- a laboratory investigation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Excitation of VLF hiss by a laser-produced plasma-- a laboratory investigation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1438368