Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: magnetic storm

Sortuj według:

Ogranicz wyniki do:

Dynamic and Thermal Processes in the Mid-Latitude Ionosphere over Kharkov, Ukraine (49.6° N, 36.3° E), During the 13-15 November 2012 Magnetic Storm: Calculation Results

Lyashenko M. V.

Acta Geophysica

2016

Vol. 64, no. 6

2717--2733

Calculation results of the variations of dynamic and thermal process parameters in geospace plasma during the 13-15 November 2012, magnetic storm (MS) over Kharkov are presented. The calculations were based on experimental data obtained on the Kharkov incoherent scatter radar, single in the European mid-latitudes. Calculations showed that during the MS there took place an increase, by modulus, of the values of vertical component of transfer velocity, due to ambipolar diffusion, up to a factor of 1.4-2.1. During the MS there took place a decrease of the values of energy input to the electron gas by about 20-35%. During the main phase of MS, the heat flux density transferred by electrons increased up to a factor of 2-2.5. Results of estimates of the zonal component electric field value Ey are presented. During the MS the value of Ey was –9.5 mV/m. The vertical component of plasma velocity due to electromagnetic drift vEB has been calculated.

Ionospheric scintillations computation using real-time GPS observations

Nykiel G., Rachoń L., Figurski M.

Artificial Satellites : Journal of Planetary Geodesy

2014

Vol. 49, No. 1

43--53

The following paper presents the results of quasi-real-time determination of the values of phase scintillations indices at the period of ionospheric disturbances that occurred as a consequence of the Sun flares observed on March 7 and 9, 2012. Double-frequency observations with 1-second measurement interval from the EPN (EUREF Permanent Network) network sites located at high latitudes were used for the analysis. To determine the phase scintillations it is necessary to apply data filtering in order to separate the trend of low frequencies (e.g. satellite motion) from high frequency oscillations (e.g. scintillations). Elimination of low frequency components of the signal using moving average was proposed in the research. This approach was conditioned by the necessity to apply an optimum method of filtering for quasi-real-time calculations. The scintillation parameters were calculated by means of three different algorithms and the results were compared. Additionally, relations between changes of the parameters and the ROTI index, describing the temporal changes of TEC, and the decrease of positioning accuracy at the analyzed sites were searched.