Discrete Auroral Radio Emissions

Details Discrete Auroral Radio Emissions Discrete Auroral Radio Emissions

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa14a..05w&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SA14A-05

Other

2407 Auroral Ionosphere (2704), 2439 Ionospheric Irregularities, 2471 Plasma Waves And Instabilities (2772), 2481 Topside Ionosphere, 2487 Wave Propagation (0689, 3285, 4275, 4455, 6934)

Scientific paper

The eigenvalue analysis for discrete upper-hybrid/Langmuir waves trapped in cylindrical density structures is carried out. It is shown that in the overdense case (fpe>fce), discrete Langmuir waves are associated with density cavities, while discrete upper-hybrid waves are excited within enhanced density column. Three examples are considered; the Kilometric Continuum (KC) Emission, rocket observation of Langmuir waves in the auroral ionosphere, and the Auroral Roar (AR) Emission. For physical parameters appropriate for KC source region, it is found that the frequency spacing between individual fine structure spectrum is within the observed range of 0.1~1 kHz. McAdams and LaBelle [1999] interpreted recent wideband observations of Langmuir waves in the auroral ionosphere as discrete Langmuir waves in density cavity. This paper formalize their theory. It is shown that discrete spectrum of electric field is largely determined by the electrostatic wave equation although a very low level of of electromagnetic waves is also present. In the case of AR, a theory is developed which describes the existence of discrete upper-hybrid waves trapped in density enhancement. It is shown that upper-hybrid waves can escape the source region and propagate to remote regions by coupling O-mode electromagnetic waves. These findings may be highly relevant to observations of many other ionospheric, magnetospheric, and planetary fine frequency structure emissions.

Affiliated with

Also associated with

No associations

Rating

Discrete Auroral Radio Emissions 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 Discrete Auroral Radio Emissions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Discrete Auroral Radio Emissions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-752430