Magnetic Clouds Fitted by a Constant-Alpha Force-Free Toroidal Solution

0355336 - ASÚ 2015 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Vandas, Marek - Romashets, E. P.
Magnetic Clouds Fitted by a Constant-Alpha Force-Free Toroidal Solution.
Twelfth International Solar Wind Conference. Proceedings Paper. New York: Melville, 2010 - (Maksimovic, M.; Issautier, K.; Meyer-Vernet, N.; Moncuquet, M.; Pantellini, F.), s. 403-407. AIP Conference Proceedings, 1216. ISBN 978-0-7354-0759-6. ISSN 0094-243X.
[Twelve International Solar Wind Conference. Saint-Malo (FR), 21.06.2009-26.06.2009]
Grant CEP: GA AV ČR 1QS300120506; GA ČR GA205/09/0170; GA MŠMT ME09032
Výzkumný záměr: CEZ:AV0Z10030501
Klíčová slova: interplanetary * magnetic fields * particle emission
Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech

Magnetic clouds have been defined as special regions in the solar wind with higher magnetic field magnitude, lower proton temperature, and large rotation of the magnetic field vector. In some cases, the rotation exceeds 180° and it is interpreted as a signature that a magnetic cloud/flux rope is curved. It corresponds to common understanding that magnetic clouds are large interplanetary flux ropes, which have loop-like shapes in the heliosphere. In such cases, magnetic clouds are fitted by approximate linear force-free toroidal solutions (derived for large aspect ratios). Here an exact constant-alpha force-free toroidal solution is compared with approximate ones and it is found a reasonable agreement even for low aspect ratios.
Trvalý link: http://hdl.handle.net/11104/0194132