Other
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa41b1855k&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA41B-1855
Other
[2437] Ionosphere / Ionospheric Dynamics, [2481] Ionosphere / Topside Ionosphere
Scientific paper
In order to estimate the plasmaspheric electron content (PEC) the GPS observations, ionosonde measurements and radio occultation (RO) data were analyzed. GPS observations provide information about values of vertical total electron content (TEC) up to the 20200 km. Ionosonde measurements retrieve bottomside part of electron density profiles, while RO data is used for reconstruction of the electron density profiles up to the satellite orbit altitude. This study concerns European mid-latitudes region with two closely located ionosonde stations - Pruhonice (50.0 N, 14.6 E) and Juliusruh (54.6 N, 13.4 E). Ionosonde data visualization, ionograms, critical frequency of F2 layer (foF2) values and electron density profiles, were provided by European Digital Upper Atmosphere Server (DIAS). To obtain the bottomside ionospheric electron content (IECb) we integrated the bottomside Ne profiles derived from digisonde. Topside ionosonde profiles, obtained by fitting a model to the peak electron density value, were used to estimate the topside ionospheric electron content (IECt). Also, electron density profiles derived from FormoSat-3/COSMIC RO measurements were included into analysis. The data integration was carried out up to the height of NmF2n order to obtain COSMIC-derived IECb and IECt estimates. Therefore, for the present study the upper limit of the ionosphere was located at 750-800 km (altitude of COSMIC satellites). The TEC values were calculated using the observations from the ground-based GPS stations located close to the ionosondes. The vertical GPS TEC estimates can be split into two contributions, one part due to the bottomside ionosphere and the other part due to the topside ionosphere. The topside part of TEC contains IECt and PEC. So, comparison of GPS TEC, F3/C IEC and ionosonde IEC was carried out for different seasonal conditions during a period of low solar activity. Special attention was focused on the differences in topside and bottomside part contribution to TEC for night and daytime hours.
Krankowski Andrzej
Krypiak-Gregorczyk A.
Wielgosz P.
Zakharenkova I.
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