Magnetic Clouds seen at different locations in the Heliosphere

RODRIGUEZ L.; ZHUKOV, A. N.; DASSO, S.; MANDRINI, C. H.; CREMADES, H.; CID, C.; CERRATO, Y.; SAIZ, E.; ARAN, A.; MENVIELLE, M.; POEDTS, S.; SCHMIEDER, B.

ANNALES GEOPHYSICAE

Año: 2008 vol. 26 p. 213 - 229

0992-7689

We analyze two magnetic clouds (MCs) observedin different points of the heliosphere. The main aim ofthe present study is to provide a link between the differentaspects of this phenomenon, starting with informationon the origins of the MCs at the Sun and following bythe analysis of in-situ observations at 1AU and at Ulysses.The candidate source regions were identified in SOHO/EITand SOHO/MDI observations. They were correlated withH-alpha images that were obtained from ground-based observatories.Hints on the internal magnetic field configurationof the associated coronal mass ejections are obtainedfrom LASCO C2 images. In interplanetary space, magneticand plasma moments of the distribution function of plasmaspecies (ACE/Ulysses) were analyzed together with informationon the plasma composition, and the results were comparedbetween both spacecraft in order to understand howthese structures interact and evolve in their cruise from theSun to 5AU. Additionally, estimates of global magnitudesof magnetic fluxes and helicity were obtained from magneticfield models applied to the data in interplanetary space. Wehave found that these magnetic characteristics were well keptfrom their solar source, up to 5AU where Ulysses providedvaluable information which, together with that obtained fromACE, can help to reinforce the correct matching of solarevents and their interplanetary counterparts.