Journal : Acta Geophysica
Article : Configuration of the upper boundary of the ionosphere

Authors :
Teisseyre, R.
Institute of Geophysics, Polish Academy of Sciences ul. Księcia Janusza 64, 01-452 Warszawa, Poland,,
Pilchin, A.N.
Universal Geoscience and Environmental Consulting Company, 205 Hilda Ave., Willowdale, Ontario, M2M 4B1, Canada,,
Bubnov, V.P.
North-West Ltd., Podolskih kursantov 24D, 117546 Moscow, Russia,,
Bojdys, G.
Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland,,
Essa, K.S.
Geophysics Department, Faculty of Science, Cairo University, Giza, Egypt,,
Pietsch, K.
Department of Geophysics, Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland,,
Kostecki, A.
Oil and Gas Institute, ul. Lubicz 25A, 31-503 Kraków, Poland,,
Bała, M.
Faculty of Geology, Geophysics and Environmental Protection, AGH University of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Kraków, Poland,,
Brojewski, R.
Warsaw University, ICM, ul. Pawińskiego 5a, 02-106 Warszawa, Poland; AVIOMET Ltd., ul. Miła 25/7, 01-033 Warszawa, Poland,,
Gulyaeva, T.L.
IZMIRAN, 142190 Troitsk, Moscow Region, Russia,,
Abstract : Variations of the upper boundary of the ionosphere (UBI) are investigated based on three sources of information: (i) ionosonde-derived parameters: critical frequency foF2, propagation factor M3000F2, and sub-peak thickness of the bot-tomside electron density profile; (ii) total electron content (TEC) observations from signals of the Global Positioning System (GPS) satellites; (iii) model electron densities of the International Reference Ionosphere (IRI*) extended towards the plasmasphere. The ionospheric slab thickness is calculated as ratio of TEC to the F2 layer peak electron density, NmF2, representing a measure of thickness of electron density profile in the bottomside and topside ionosphere eliminating the plasmaspheric slab thickness of GPS-TEC with the IRI* code. The ratio of slab thickness to the real thickness in the topside ionosphere is deduced making use of a similar ratio in the bottomside ionosphere with a weight Rw. Model weight Rw is represented as a superposition of the base-functions of local time, geomagnetic latitude, solar and magnetic activity. The time-space variations of domain of convergence of the ionosphere and plasmasphere differ from an average value of UBI at ~1000 km over the earth. Analysis for quiet monthly average conditions and during the storms (Sep-tember 2002, October–November 2003, November 2004) has shown shrinking UBI altitude at daytime to 400 km. The upper ionosphere height is increased by night with an ‘ionospheric tail’ which expands from 1000 km to more than 2000 km over the earth under quiet and disturbed space weather. These effects are interposed on a trend of increasing UBI height with solar activity when both the critical frequency foF2 and the peak height hmF2 are growing during the solar cycle.

Keywords : ionosphere, plasmasphere, total electron content, model electron density, International Reference Ionosphere,
Publishing house : Instytut Geofizyki PAN
Publication date : 2007
Number : Vol. 55, no. 2
Page : 253 – 266

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Qute : Teisseyre, R. ,Pilchin, A.N. ,Bubnov, V.P. ,Bojdys, G. ,Essa, K.S. ,Pietsch, K. ,Kostecki, A. ,Bała, M. ,Brojewski, R. ,Gulyaeva, T.L. ,Gulyaeva, T.L. , Configuration of the upper boundary of the ionosphere. Acta Geophysica Vol. 55, no. 2/2007