10 research outputs found
Short-term variability of the Sun-Earth system: an overview of progress made during the CAWSES-II period
Get PDF3D evolution of solar magnetic fields and high-speed solar wind streams near the minimum of solar cycle 23
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Solar origins of intense geomagnetic storms in 2002 as seen by the CORONAS-F satellite
No full textInternational audienceWe analyze solar origins of intense geomagnetic perturbations recorded during 2002. All of them were related to coronal mass ejections (CMEs). The initiation of CMEs was documented using the SPIRIT instrument (SPectrohelIographic Soft X-Ray Imaging Telescope) onboard the CORONAS-F satellite. Monochromatic full Sun images taken in the Mg XII doublet at 8.418 and 8.423 Ă
showed the appearance of free energy release sites at altitudes up to 0.4 solar radii. CMEs were initiated at these sites and propagated in interplanetary space under appropriate local conditions including the geometry of the magnetic fields
Discussion paper: Comments on physical properties of strongest perturbations on the Sun in the heliosphere and the magnetosphere
No full textSporadic and recurrent geomagnetic disturbances in 1859â1860 according to the archived data from the Russian network of stations
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