Wavelength measurement of auroral hiss

Details Wavelength measurement of auroral hiss Wavelength measurement of auroral hiss

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9621299e&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Dec. 1, 1991, p. 21,299-21,307.

Computer Science

Sound

17

Auroral Zones, Earth Ionosphere, Hiss, Random Noise, Wavelengths, Electron Energy, Sounding Rockets, Very Low Frequencies

Scientific paper

The average wavelengths of VLF emissions in the auroral ionosphere were measured as a function of frequency using an orthogonal antenna technique. The measurements, made by an auroral sounding rocket, were sensitive to wavelengths between about 5 m and about 300 m for wave frequencies from 20 to 10 kHz. The emissions just above the lower hybrid frequency had wavelengths of 12 m or less in many cases, increasing with increasing frequency. The measured wavelengths were such that the VLF emissions were resonant with electrons whose energies were a few hundred eV, whereas the inverted-V electrons had energies of about 20 keV. Bursts of low-energy (less than 300 eV to about 3 keV), field-aligned electron fluxes were observed often during the flight, but no direct correlation between the flux intensity and the VLF intensity or wavelength could be found. The shorter-than-expected wavelengths were found in different types of VLF spectra. The steady state VLF spectra generally displayed a typical sharp cutoff below the lower hybrid frequency with a maximum at several times the lower hybrid frequency. These spectra also had structure at hydrogen cyclotron harmonics above the lower hybrid frequency.

Affiliated with

Also associated with

No associations

Rating

Wavelength measurement of auroral hiss 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 Wavelength measurement of auroral hiss, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wavelength measurement of auroral hiss will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1539844