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Frequency‐Shifted Signature of the HF Pump in the Ionospheric Focused Heating Experiment
Author(s) -
Rodriguez Paul,
Siefring Carl L.,
Bernhardt Paul A.,
Haas Daniel G.,
Baumback Mark M.
Publication year - 1997
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/97gl00532
Subject(s) - ionosphere , doppler effect , altitude (triangle) , reflection (computer programming) , rocket (weapon) , high frequency , physics , signature (topology) , computational physics , geophysics , geology , radio wave , optics , geography , astronomy , computer science , mathematics , geometry , archaeology , programming language , quantum mechanics
Ionospheric heating experiments have begun to examine interactions at altitudes where the heater HF wave frequency matches the local electron plasma frequency. We discuss the frequency‐shifted signature observed by radiowave receivers on a rocket launched into the HF beam and approaching the interaction altitude. The frequency shifts associated with the upgoing (transmitted) and the downgoing (reflected) waves arise from the Doppler effect and changes in the wave vector. The characteristic spectral signature provides a method to locate the reflection altitude accurately. Generally, the ratio of intensities of upgoing and downgoing waves decreases as the reflection altitude is approached.