Perturbations of GPS Signals by the Ionospheric Irregularities Caused by HF- heating

Details Perturbations of GPS Signals by the Ionospheric Irregularities Caused by HF- heating Perturbations of GPS Signals by the Ionospheric Irregularities Caused by HF- heating

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa43b1587g&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA43B-1587

Physics

2403 Active Experiments, 2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities, 2471 Plasma Waves And Instabilities (2772), 2487 Wave Propagation (0689, 3285, 4275, 4455, 6934)

Scientific paper

Generation of artificial field-aligned irregularities of electron density due to the ionospheric heating by powerful radio wave of O-mode was first discovered in mid-seventies, and was widely studied since. It was found that the wavelength spectrum of the artificial irregularities is in the range from tens of meters to kilometers. Different mechanisms are responsible for the generation of field-aligned irregularities of electron density due to HF-heating. They include ponderomotive parametric instability, thermal instability, self- focusing instability. A new mechanism for generation of super small scale field-aligned irregularities of the size of tens centimeters was recently suggested by Gurevich and Zybin [2006]. According to this model the upper hybrid waves due to HF-heating can be trapped inside striations producing standing Bernstein waves. The latter have large amplitude, and thus produce the ponderomotive force which in turn pushes plasma away from the electric field peaks. As a result the plasma irregularities will be created having the transverse scale size λ/2 where λ~10-40 cm is the Bernstein wavelength, while the longitudinal scale size is of about 1 km. These field aligned irregularities were termed super small scale irregularities (SSS). In this talk we present the first experimental evidence of strong perturbations of GPS signals by the SSS irregularities of the electron density caused by the HF-heating of the F2 region of the ionosphere. The experiments were conducted using the HAARP Ionospheric Research Instrument with the radiating frequency close to the triple electron gyro frequency. The critical diagnostic instrument was GPS receiver located at HAARP which detects the changes in differential phase of GPS signals passing through the HF-heated spot. It was found that after the start of the HF-heating differential phase of the probe GPS signals changed abruptly in about 10 s, and then oscillated with the heating period 20 s. The oscillations lasted for 4-5 minutes and then disappeared, presumably when the resonance condition was not satisfied, although the HF-heating continued. The phase oscillations indicate the presence of SSS irregularities of the electron density caused by the HF-heating at the frequency matching the triple electron gyro frequency. Gurevich A. V., and K. P. Zybin (2006), Phys. Lett. A, 358, 159.

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