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Ann. Geophys., 25, 895-904, 2007
www.ann-geophys.net/25/895/2007/
© European Geosciences Union 2007
Assessing the quality of ionogram interpretation using the HF Doppler technique
D. Buresova1, V. Krasnov1,2, Ya. Drobzheva1,2, J. Lastovicka1, J. Chum1, and F. Hruska1
1Institute of Atmospheric Physics, 14131 Prague, Czech Republic
2Institute of the Ionosphere, Almaty, Republic of Kazakhstan
Abstract. The first joint common volume measurements by the Digisonde Portable Sounder
(DPS-4) and a new Doppler type system has been run at the Pruhonice
ionospheric observatory (49.99° N, 14.54° E) since January 2004. The
measurement of the Doppler shift is carried out continuously on a frequency
of 3.6 MHz, thus the radio wave is reflected predominantly from the
ionospheric F layer. To compare digisonde measurements with the Doppler
data, a phase path was calculated from both Doppler and digisonde records.
Under stormy conditions and in the case where a sporadic E layer was
present, a significant disagreement between both measurements has been
found. The discrepancies could be related to the uncertainties of the
observational inputs and to the interpretation of the digisonde data. The
comparison of the phase paths shows that during geomagnetically quiet days,
in the absence of the sporadic E layer, and when high quality ionograms are
available and correctly scaled, the electron density N(h) profiles,
calculated by the Automatic Real Time Ionogram Scaler with True height
algorithm (ARTIST), can be considered reliable.
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