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| Titel |
Probing of medium-scale traveling ionospheric disturbances using HF-induced scatter targets |
| VerfasserIn |
N. F. Blagoveshchenskaya, T. D. Borisova, V. A. Kornienko, I. V. Moskvin, M. T. Rietveld, V. L. Frolov, V. P. Uryadov, L. M. Kagan, Yu. M. Yampolski, V. L. Galushko, A. V. Koloskov, S. B. Kasheev, A. V. Zalizovski, G. G. Vertogradov, V. G. Vertogradov, M. C. Kelley |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 24, no. 9 ; Nr. 24, no. 9 (2006-09-20), S.2333-2345 |
| Datensatznummer |
250015630
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| Publikation (Nr.) |
 copernicus.org/angeo-24-2333-2006.pdf |
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| Zusammenfassung |
| Experimental results from the Tromsø and Sura heating
experiments at high and mid-latitudes are examined. It is shown that the
combination of HF-induced target and bi-static HF Doppler radio scatter
observations is a profitable method for probing medium-scale traveling
ionospheric disturbances (TIDs) at high and mid-latitudes. HF ionospheric
modification experiments provide a way of producing the HF-induced scatter
target in a controlled manner at altitudes where the sensitivity to TIDs is
highest. Bi-static HF Doppler radio scatter observations were carried out on
the London-Tromsø-St. Petersburg path in the course of a Tromsø
heating experiment on 16 November 2004 when the pump wave was reflected from
an auroral Es-layer. During Sura heating experiments on 19 and 20 August 2004,
when the HF pump wave was reflected from the F2 ionospheric layer,
multi-position bi-static HF Doppler radio scatter observations were
simultaneously performed at three reception points including St. Petersburg,
Kharkov, and Rostov-on-Don. Ray tracing and Doppler shift simulations were
made for all experiments. A computational technique has been developed
allowing the reconstruction of the TID phase velocities from multi-position
bi-static HF Doppler scatters. Parameters of medium-scale TIDs were found.
In all experiments they were observed in the evening and pre-midnight hours.
TIDs in the auroral E-region with periods of about 23 min were traveling
southward at speeds of 210 m/s. TIDs in the mid-latitudinal F-region with
periods from 20 to 45 min travelled at speeds between 40 and 150 m/s. During
quiet magnetic conditions the waves were traveling in the north-east
direction. In disturbed conditions the waves were moving in the south-west
direction with higher speeds as compared with quiet conditions. Possible
sources for the atmospheric gravity waves at middle and high latitudes are
discussed. |
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