skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: HF-enhanced plasma lines in the lower ionosphere

Abstract

The ionospheric modification facility at Arecibo, Puerto Rico, has been used to study Langmuir waves excited in the lower ionosphere by a high-power HF radio wave. Measurements of HF-enhanced plasma lines have been made in the lower F region (less than 160 km altitude) and in the E region using the 430-MHz radar at Arecibo Observatory. These measurements complement observations made in the past at higher altitudes. Enhanced plasma line spectra observed in the lower F region peak at the so-called 'decay line' and contain additional spectral structure similar to that found in the upper F region. In the E region the spectra exhibit narrow peaks located at 430 MHz + or - f(HF), where f(HF) is the frequency of the modifying HF wave. While strong plasma line enhancements are commonly observed in sporadic E, only weak enhancements have been detected in the normal daytime E layer. Candidate mechanisms for the E region enhancements include the oscillating two-stream instability and direct conversion of the HF wave into Langmuir waves.

Authors:
Publication Date:
Research Org.:
Aerospace Corp., Space Sciences Laboratory, Los Angeles, CA
OSTI Identifier:
6530261
Resource Type:
Journal Article
Journal Name:
Radio Sci.; (United States)
Additional Journal Information:
Journal Volume: 19
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; E REGION; PLASMA WAVES; F REGION; LANDAU DAMPING; RADIOWAVE RADIATION; WAVE PROPAGATION; DAMPING; EARTH ATMOSPHERE; ELECTROMAGNETIC RADIATION; IONOSPHERE; PLANETARY IONOSPHERES; RADIATIONS; 640201* - Atmospheric Physics- Auroral, Ionospheric, & Magetospheric Phenomena

Citation Formats

Djuth, F T. HF-enhanced plasma lines in the lower ionosphere. United States: N. p., 1984. Web. doi:10.1029/RS019i001p00383.
Djuth, F T. HF-enhanced plasma lines in the lower ionosphere. United States. https://doi.org/10.1029/RS019i001p00383
Djuth, F T. 1984. "HF-enhanced plasma lines in the lower ionosphere". United States. https://doi.org/10.1029/RS019i001p00383.
@article{osti_6530261,
title = {HF-enhanced plasma lines in the lower ionosphere},
author = {Djuth, F T},
abstractNote = {The ionospheric modification facility at Arecibo, Puerto Rico, has been used to study Langmuir waves excited in the lower ionosphere by a high-power HF radio wave. Measurements of HF-enhanced plasma lines have been made in the lower F region (less than 160 km altitude) and in the E region using the 430-MHz radar at Arecibo Observatory. These measurements complement observations made in the past at higher altitudes. Enhanced plasma line spectra observed in the lower F region peak at the so-called 'decay line' and contain additional spectral structure similar to that found in the upper F region. In the E region the spectra exhibit narrow peaks located at 430 MHz + or - f(HF), where f(HF) is the frequency of the modifying HF wave. While strong plasma line enhancements are commonly observed in sporadic E, only weak enhancements have been detected in the normal daytime E layer. Candidate mechanisms for the E region enhancements include the oscillating two-stream instability and direct conversion of the HF wave into Langmuir waves.},
doi = {10.1029/RS019i001p00383},
url = {https://www.osti.gov/biblio/6530261}, journal = {Radio Sci.; (United States)},
number = ,
volume = 19,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 1984},
month = {Sun Jan 01 00:00:00 EST 1984}
}