Results 31 to 40 of about 39,299 (228)

Circulation changes in the winter lower atmosphere and long-lasting solar/geomagnetic activity [PDF]

Annales Geophysicae, 2012
The paper describes the association between high long-lasting solar/geomagnetic activity and geopotential height (GPH) changes in the winter lower atmosphere, based on their development in the Northern Hemisphere in the winter periods (December–March)
J. Bochníček, H. Davídkovová, H. Davídkovová, P. Hejda, R. Huth, R. Huth   +5 more
doaj   +1 more source

Relation of Extreme Ionospheric Events with Geomagnetic and Meteorological Activity

Atmosphere, 2022
This paper studies extreme ionospheric events and their relations with geomagnetic and meteorological activity. With the long observation series at the Irkutsk (52° N, 104° E) and Kaliningrad (54° N, 20° E) ionosondes we obtained the datasets of ...
Konstantin G. Ratovsky, Maxim V. Klimenko, Alexei V. Dmitriev, Irina V. Medvedeva   +3 more
doaj   +1 more source

Geomagnetic effects caused by rocket exhaust jets

Solar-Terrestrial Physics, 2016
In the space experiment Radar–Progress, we have made 33 series of measurements of geomagnetic variations during ignitions of engines of Progress cargo spacecraft in low Earth orbit.
Lipko Yu.V., Pashinin A.Yu., Rakhmatulin R.A., Khakhinov V.V.   +3 more
doaj   +1 more source

Dependence of Quiet Time Geomagnetic Activity Seasonal Variation on the Solar Magnetic Polarity [PDF]

Journal of Astronomy and Space Sciences, 2013
The geomagnetic activity shows the semiannual variation stronger in vernal and autumnal equinoxes than in summer and winter solstices. The semiannual variation has been explained by three main hypotheses such as Axial hypothesis, Equinoctial hypothesis ...
Suyeon Oh
doaj   +1 more source

Recurrent geomagnetic storms and relativistic electron enhancements in the outer magnetosphere: ISTP coordinated measurements [PDF]

, 1997
New, coordinated measurements from the International Solar-Terrestrial Physics (ISTP) constellation of spacecraft are presented to show the causes and effects of recurrent geomagnetic activity during recent solar minimum conditions.
Allen, J. H., Baker, D. N., Bargatze, L. F., Belian, R. D., Blake, J. B., Kanekal, S. G., Klecker, B., Li, X., Reeves, G. D., Sheldon, R. B., Spence, Harlan E., Turner, N.   +11 more
core   +2 more sources

Ionospheric F2-Layer Semi-Annual Variation in Middle Latitude by Solar Activity [PDF]

Journal of Astronomy and Space Sciences, 2010
We examine the ionospheric F2-layer electron density variation by solar activity in middle latitude by using foF2 observed at the Kokubunji ionosonde station in Japan for the period from 1997 to 2008.
Yoon-Kyung Park, Young-Sil Kwak, Byung-Ho Ahn, Young-Deuk Park, Il-Hyun Cho   +4 more
doaj   +1 more source

Geomagnetic disturbances analysis using discrete wavelets [PDF]

Geofísica Internacional, 2008
To assess long-term trends and periodicities in geomagnetic storms, the discrete wavelet transform, using the Daubechies function, was applied. Among a variety of techniques, which are available for analyzing variability, wavelet analysis has emerged in ...
E. M. Zotto, P. Fernandez de Campra, M. Zossi de Artigas   +2 more
doaj  

Explicit IMF $B_y$-effect maximizes at subauroral latitudes (Dedicated to the memory of Eigil Friis-Christensen)

, 2019
The most important parameter in the coupling between solar wind and geomagnetic activity is the $B_z$-component of the interplanetary magnetic field (IMF).
Gopalswamy, Nat, Holappa, Lauri, Mursula, Kalevi   +2 more
core   +1 more source

Forecasting geomagnetic activity

pure and applied geophysics, 1988
A study of the daily, monthly and annual values of the geomagnetic activity indexAp for 1932 onwards and of the annualaa indices for 1868 onwards indicated that their variations had large random components. Long-term predictions were not possible from time-series extrapolations.
openaire   +2 more sources

Spectrum analysis of short-period K index behaviour at high and mid-latitudes [PDF]

Annales Geophysicae, 2015
Geomagnetic activity levels during the declining phase and solar minimum period of the solar cycle are considerably different from those during the solar maximum phase.
P. B. Kotzé
doaj   +1 more source