Dynamics of the midlatitude ionospheric <Emphasis Type="Italic">F</Emphasis> region at sunrise |
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| Authors: | A F Yakovets V V Vodyannikov K Zh Nurmukhanbetova G I Godrienko Yu G Litvinov |
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| Institution: | (1) Max Planck Institute for Solar System Research, 37191 Katlenburg-Lindau, Germany;(2) Department of Physics and Astronomy, University of Iowa, Iowa City, IA 52242, USA;(3) Istituto di Astrofisica Spaziale e Fisika Cosmica (NAF), 00133 Rome, Italy;(4) Jet Propulsion Laboratory, Pasadena, CA 91109, USA;(5) Infocom Department, “La Sapienza” University of Rome, 00184 Rome, Italy;(6) School of Earth and Space Sciences, Peking University, Beijing, 100871, P. R. China |
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| Abstract: | The behavior of the F2 layer at sunrise has been studied based on vertical-incidence ionospheric sounding data in Almaty (76°55′E, 43°15′N). Records with small amplitudes of electron density background fluctuations were selected in order to exactly estimate the onsets of a pronounced increase in the electron density at different altitudes. It has been indicated that the electron density growth rate is a function of altitude; in this case, the growth rate at the F2 layer maximum is much lower than such values at fixed altitudes of ～30–55 km below the layer maximum. The solar zenith angle (χ) and the blanketing layer thickness (h 0) at the beginning of a pronounced increase in the electron density at altitude h are linearly related to the h value, and these quantities vary within ～90° < χ < 100° and 180 km < h 0 < 260 km, respectively. |
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