Articles | Volume 28, issue 8
Ann. Geophys., 28, 1581–1588, 2010
https://doi.org/10.5194/angeo-28-1581-2010

Special issue: Three eyes on the Sun – multi-spacecraft studies of...

Ann. Geophys., 28, 1581–1588, 2010
https://doi.org/10.5194/angeo-28-1581-2010

  26 Aug 2010

26 Aug 2010

How do fits of simulated magnetic clouds correspond to their real shapes in 3-D?

M. Vandas1, E. Romashets2,3, and A. Geranios4 M. Vandas et al.
  • 1Astronomical Institute, Academy of Sciences of the Czech Republic, 141 31 Praha 4, Czech Republic
  • 2Prairie View A& M University, Mail Stop 2250, P.O. Box 519, Prairie View TX 77446, USA
  • 3Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation, Russian Academy of Sciences, Troitsk, Moscow Region, 142092, Russia
  • 4Physics Department, University of Athens, Panepistimioupoli-Kouponia, Athens 15771, Greece

Abstract. Magnetic clouds are important objects for space weather forecasters due to their impact on the Earth's magnetosphere and their consequences during geomagnetic storms. Being considered as cylindrical or toroidal flux ropes, their size, velocity, magnetic field strength, and axis orientation determine its impact on Earth. Above mentioned parameters are usually extracted from model fits using measurements from one-spacecraft crossings of these structures. In order to relate solar events with these spacecraft observations, the parameters are then compared to situation at the Sun around a most probable source region with a goal to correlate them with near-Sun observed quantities for prediction purposes. In the past we performed three-dimensional simulations of magnetic cloud propagation in the inner heliosphere. Simulated spacecraft measurements are fitted by models of magnetic clouds and resulting parameters are compared with real shapes of magnetic clouds which can be directly obtained from our simulations. The comparison shows that cloud parameters are determined quite reliably for spacecraft crossings near the cloud axis.