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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Study of Chance for Good DDA Drift Velocity Estimation for Ionospheric F-region Drift Measurements
 Kouba, Daniel ; Koucká Knížová, Petra
Estimation of the plasma drift velocity measured by Digisonde depends on the number of reflection points and their distribution. In the paper we divide and analyse plasma drift measurements according to the number of reflection points. A detailed study of Digisonde drift measurement quality has not been published yet. Two extreme groups are selected for further detail analysis, the first one with less than 100 reflection points and the second with more than 800 points. Within the data in these groups we detect annular and diurnal variability. Measurements containing low number of the reflection points occur mainly around equinoxes and during day-time. On the contrary, maximum occurrence of the measurements with more than 800 points is in winter and summer. The lowest chance to register extreme number of the reflections is during afternoon and around sunset.
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Driftová měření pro F-vrstvu ionosféry na stanici Průhonice - sezonní průběhy charakteristik pro klidné dny
 Kouba, Daniel ; Šauli, Petra ; Boška, Josef ; Santolík, Ondřej
In the paper we concentrate on the F-region drift-data measured by the ionospheric station Pruhonice (50.0N, 14.6E). We demonstrate application of the skymap points selection method on the data set collected in 2006, during a period of low geomagnetic and solar activity. Using histograms of horizontal and vertical velocity components we found prevailing directions of plasma motion corresponding to specified ranges of velocities. Within the analyzed data we found significant decrease of the daily-maximal horizontal component from winter to summer 2006.
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