Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh33b0406q&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH33B-0406
Physics
2101 Coronal Mass Ejections (7513), 2134 Interplanetary Magnetic Fields, 7513 Coronal Mass Ejections (2101), 7519 Flares, 7526 Magnetic Reconnection (2723, 7835)
Scientific paper
We present the first quantitative comparison between the total magnetic reconnection flux in low-corona at the wake of coronal mass ejections (CMEs) and the magnetic flux in magnetic clouds (MCs) that reach 1~AU 2 - 3 days after CME onset. The total reconnection flux is measured from flare ribbons, and the MC flux is computed using in-situ observations at 1~AU, all ranging from 10^{20-22} Mx. It is found that for the studied 9 events, in which the association between flares, CMEs, and MCs is identified, the MC flux is correlated with the total reconnection flux Φ_r. Further, the poloidal (azimuthal) MC flux Φ_p is comparable with reconnection flux Φr, and the toroidal (axial) MC flux Φ_t is a fraction of Φr. Events associated with filament eruption do not exhibit a different Φt, p - Φ_r relation from events not accompanied by erupting filaments. The revealed relations between these independently measured physical quantities suggest that, for the studied samples, the magnetic flux and twist of the interplanetary magnetic flux rope, reflected by MCs, are highly relevant to low-corona magnetic reconnection during the eruption. %which contributes significantly to the formation of the helical structure of the flux ropes. We discuss the implication on the formation mechanism of twisted magnetic flux ropes, namely, whether the helical structure of the magnetic flux rope is largely pre-existing or formed in-situ by low-corona magnetic reconnection. We also measure magnetic flux encompassed in coronal dimming regions (Φ_d) and discuss its relation with reconnection flux inferred from flare ribbons and MC flux.
Howard Tim
Hu Qiang
Qiu Jianwei
Yurchyshyn Vasyl
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