Temporal evolution of the HF-enhanced plasma line in sporadic E

Details Temporal evolution of the HF-enhanced plasma line in sporadic E Temporal evolution of the HF-enhanced plasma line in sporadic E

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93..196d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Jan. 1, 1988, p. 196-208. Research supported by Aerospace-Sponsored R

Computer Science

Numerical Analysis

6

Electrostatic Probes, High Frequencies, Radio Waves, Sporadic E Layer, Wave Propagation, Numerical Analysis, Steady State

Scientific paper

The high-power HF facility at Arecibo has been used to study the excitation of Langmuir waves in midlatitude sporadic E. Measurements of the temporal evolution of the so-called HF-enhanced plasma line (HFPL) were made using the Arecibo 430-MHz radar. After HF turn-on in the plasma the HFPL exhibtis a rapid growth phase followed by a quick overshoot. During periods of strong HFPL excitation the e-folding growth time of the HFPL power is typically less than about 20 microsec, and the total overshoot period is about 1 ms. Mode conversion of the HF wave into Langmuir waves near HF reflection thus appears to be a promising mechanism for the production of Langmuir waves in sporadic E. Caviton formation at the critical layer is expected to accompany this process, and there is some evidence that the 430-MHz radar is probing the plasma in a region where density cavities of this nature form. While no specific explanation is offered for the HFPL overshoot, it appears that this phenomenon is fundamental to the Langmuir wave excitation process.

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