全部文献期刊学位论文会议报纸专利标准年鉴图书|学者科研项目
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作者:K. Schlegel , M. Ignat ...
来源:[J].Annales Geophysicae(IF 1.518), 2018, Vol.18 (9), pp.1182-1196DOAJ
摘要:Measurements of midlatitude E region coherent backscatter obtained during four summers with SESCAT, a 50 MHz Doppler system operating in Crete, Greece, and concurrent ionosonde recordings from the same ionospheric volume obtained with a CADI for one of these summers, are use...
作者:K. Schlegel , M. Füllekrug
来源:[J].Annales Geophysicae(IF 1.518), 2018, Vol.20 (9), pp.1439-1445DOAJ
摘要:An easy-to-use model to evaluate conductivities at high and middle latitudes in the height range 70–100 km is presented. It is based on electron density profiles obtained with the EISCAT VHF radar during 11 years and on the neutral atmospheric model MSIS95. The model uses so...
作者:K. Schlegel , A. V. Mikhailov
来源:[J].Annales Geophysicae(IF 1.518), 2018, Vol.18 (9), pp.1164-1171DOAJ
摘要:There are differences between existing models of solar EUV with λ < 1050 Å and between laboratory measurements of the O+ + N2 – reaction rate coefficient, both parameters being crucial for the F2-region modeling. Therefore, indirect aeronomic estimates ...
作者:K. Schlegel , A. V. Gurevich
来源:[J].Annales Geophysicae(IF 1.518), 2018, Vol.15 (7), pp.870-877DOAJ
摘要:Recently, one of the authors (A. V. G.) developed a theory of low-frequency plasma irregularities which are created as a consequence of neutral turbulence in the D and lower E regions. In the following this theory will be applied to coherent backscatter experiments with radars in...
作者:A. Mikhailov , K. Schlegel
来源:[J].Annales Geophysicae(IF 1.518), 2018, Vol.15 (3), pp.314-326DOAJ
摘要:A theoretical self-consistent method for the description of daytime Ne(h) profiles in the ionospheric F region measured by EISCAT is proposed. It is based on the use of a theoretical F-region model and measured electron density, Ne(h) , electron, Te...
作者:H. Thiemann , K. Schlegel
来源:[J].Annales Geophysicae(IF 1.518), 2018, Vol.12 (10/11), pp.1091-1100DOAJ
摘要:We model the modified two-stream plasma instability occurring in the ionospheric E-region using a 2.5-dimensional particle-in-cell code. Compared to previous similar work we concentrate on simulated quantities that can easily be measured in the real ionosphere by coherent radars ...
作者:... H. X. Liu , K. Schlegel , G. Lu
来源:[J].Annales Geophysicae(IF 1.518), 2018, Vol.20 (9), pp.1377-1384DOAJ
摘要:EISCAT/ESR radar data and in situ FAST and POLAR satellite observations are coordinately analyzed to investigate positive ionospheric storm effects in the dayside upper F-region in both the polar cap and the auroral oval during the magnetic storm of 15 May 1997. An ionizatio...
作者:T. R. Robinson , K. Schlegel
来源:[J].Annales Geophysicae(IF 1.518), 2018, Vol.18 (7), pp.799-806DOAJ
摘要:A theory of the generation of plasma density irregularities with virtually no aspect sensitivity, in the lower ionosphere at high latitudes, by electron drifts aligned with the geomagnetic field, is presented. The theory is developed through fluid equations in which the destabili...
作者:A. Mikhailov , K. Schlegel
来源:[J].Annales Geophysicae(IF 1.518), 2018, Vol.16 (5), pp.602-608DOAJ
摘要:A self-consistent method for daytime F-region modelling was applied to EISCAT observations during two periods comprising the very disturbed days 3 April 1992 and 10 April 1990. The observed strong N e decrease at F2-layer heights originated from different physical...
作者:B. J. Jackel , D. R. Moorcroft , K. Schlegel
来源:[J].Annales Geophysicae(IF 1.518), 2018, Vol.15 (1), pp.54-62DOAJ
摘要:The EISCAT UHF radar system was used to study the characteristics of E-region coherent backscatter at very large magnetic aspect angles (5–11°). Data taken using 60 μs pulses during elevation scans through horizontally uniform backscatter permitted the use of inversio...

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