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作者:D. Marin , A. V. Mikhailov
来源:[J].Annales Geophysicae(IF 1.518), 2018, Vol.18 (6), pp.653-665
摘要:Further development of the method proposed by Danilov and Mikhailov is presented. The method is applied to reveal the f oF2 long-term trends on 30 Northern Hemisphere ionosonde stations. Most of them show significant f oF2 trends. A pronounced dependence of trend magnitude on geo...
作者:A. V. Pavlov , T. Abe , K.-I. Oyama
来源:[J].Annales Geophysicae(IF 1.518), 2018, Vol.18 (10), pp.1257-1262
摘要:We present a comparison of the electron density and temperature behaviour in the ionosphere and plasmasphere measured by the Millstone Hill incoherent-scatter radar and the instruments on board of the EXOS-D satellite with numerical model calculations from a time-dependent m...
作者:D. W. Idenden
来源:[J].Annales Geophysicae(IF 1.518), 2018, Vol.16 (10), pp.1380-1391
摘要:In a previous publication we used results from a coupled thermosphere-ionosphere-plasmasphere model to illustrate a new mechanism for the formation of a large-scale patch of ionisation arising from a rapid polar cap expansion. Here we describe the thermospheric response to t...
作者:D. W. Danskin , A. V. Koustov , T. Ogawa ...
来源:[J].Annales Geophysicae(IF 1.518), 2018, Vol.20 (9), pp.1385-1397
摘要:Several factors are known to control the HF echo occurrence rate, including electron density distribution in the ionosphere (affecting the propagation path of the radar wave), D-region radio wave absorption, and ionospheric irregularity intensity. In this study, we consider ...
作者:H.-L. Lam , D. H. Boteler , L. Trichtchenko
来源:[J].Annales Geophysicae(IF 1.518), 2018, Vol.20 (7), pp.1073-1079
摘要:Active geomagnetic conditions on 12–13, 15–16, and 22–23 September 1999 resulted in geomagnetically induced currents (GIC) measurable in power systems in Canada and the United States. Different solar origins for these three events gave rise to dissimilar interplanetary ...
作者:P. Janhunen
来源:[J].Annales Geophysicae(IF 1.518), 2018, Vol.13 (7), pp.791-806
摘要:Theoretical and simulation approaches to E-region irregularities (gradient drift and Farley-Buneman instabilities) are reviewed, and an account is given of some relevant observations. A new hybrid linear dispersion relation is also derived and presented. The most important p...
作者:A. Grafe , Y. I. Feldstein
来源:[J].Annales Geophysicae(IF 1.518), 2017, Vol.18 (8), pp.874-886
摘要:The relationship between the storm-time ring current and the auroral electrojets is investigated using IMAGE magnetometer data, DSt and H-SYM, and solar wind data. Statistical results as well as the investigation of single events show that the auroral electrojets occur...
作者:T. L. Lim , J. J. Quenby , M. K. Reuss ...
来源:[J].Annales Geophysicae(IF 1.518), 2018, Vol.14 (4), pp.400-410
摘要:During November 1992, a series of forward and reverse shocks passed the ULYSSES spacecraft. Spectral and anisotropy measurements are reported for protons and alpha particles between 0.28 and 6 MeV observed by the Energetic Particle Composition Experiment, data recorded by th...
作者:A. Canals , A. R. Breen , L. Ofman ...
来源:[J].Annales Geophysicae(IF 1.518), 2018, Vol.20 (9), pp.1265-1277
摘要:Interplanetary scintillation measurements can yield estimates of a large number of solar wind parameters, including bulk flow speed, variation in bulk velocity along the observing path through the solar wind and random variation in transverse velocity. This last parameter is...
作者:A. I. Sukhorukov
来源:[J].Annales Geophysicae(IF 1.518), 2017, Vol.14 (1), pp.33-41
摘要:Tweek atmospherics generated by lightning discharges and propagated in the night-time Earth-ionosphere waveguide, have often very pronounced dispersive features near the first few waveguide cut-off frequencies ( fcm ~ m dot{s} fc 1, fc <...

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