The radar constant calibration in incoherent scatter ion line processing is essential for the data quality and was not paid enough attention previous studies. In this investigation, based on several experiments made by newly built Sanya (SYISR), we evaluated plasma both case study statistically. factor had local time altitude variations, due to corresponding variations of transmitted power, gai...

The first long-duration incoherent scatter (IS) radar observations over Millstone Hill (42.6 N, 288.5 E) and EISCAT Svalbard radar (ESR, 78.15 N, 16.05 E) from October 4 to November 4, 2002 are compared with the newly updated version of the IRI model (IRI2001). The present study showed that: (1) For the peak parameters hmF2 and foF2, the IRI results are in good agreement with the observations o...

A total eclipse occurred on 11 August 1999 with its path of totality passing over central Europe in the latitude range 40–50 N. The ionospheric responses to this eclipse were measured by a wide ionosonde network. On the basis of the measurements of foE, foF1, and foF2 at sixteen ionosonde stations in Europe, we statistically analyze the variations of these parameters with a function of eclipse ...

[1] Using a comprehensive data set and model calculations, we have investigated a prominent large-scale traveling ionospheric disturbance (LSTID) observed in Japan ( 37 –16 MLAT) on 15 September 1999, during a recovery phase of sequential storms. The LSTID was detected at 2300–2400 LT (1400–1500 UT) as an enhancement of the 630-nm airglow intensity (50!350 R), a decrease in the F layer virtual ...

An extensive intercomparison of ionospheric foF2 observations and NCAR Thermosphere-Ionosphere Electrodynamics General Circulation Model (TIE-GCM) simulations has been carried out for the dip equatorial location Thiruvananthapuram. Ionosonde measurements geomagnetically quiet days 2002, 2006 2008, representing solar maximum, minimum deep conditions have used analysis. In general TIE-GCM reprodu...

A relationship between foE trends and geomagnetic activity long-term variations has been revealed for the first time. By analogy with earlier obtained results on the foF2 trends it is possible to speak about the geomagnetic control of the foE long-term trends as well. Periods of increasing geomagnetic activity correspond to negative foE trends, while these trends are positive for the decreasing...

The present work examines the spatial and temporal distribution of positive negative TEC anomalies on global regional scale. To study local response ionosphere, foF2 data from ground ionosonde stations Madrigal CODE databases have been used. relative deviation, which also determines type during geomagnetic storms 3 4 February 2022, is considered. In study, regions their evolution are examined i...