Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsh51a..04l&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SH51A-04
Astronomy and Astrophysics
Astrophysics
7500 Solar Physics, Astrophysics, And Astronomy, 7513 Coronal Mass Ejections, 7519 Flares, 7531 Prominence Eruptions, 7835 Magnetic Reconnection
Scientific paper
In the present work, we display our results of studying and analyzing the observational data from UVCS and other remote sensing instruments for three CME/flare events that obviously developed a long current sheet during the eruptions. These results include the thickness of the current sheets, magnetic diffusivities and electrical conductivities (resistivities) of the plasma inside the current sheets. This is the first time that the electrical conductivity (resistivity) within magnetic reconnection region during the real eruptive processes has been deduced since the theory of magnetic reconnection was applied to the solar eruptions about 6 decades ago. The thickness of the current sheet developed during the January 8, 2002 event varies from 7 × 104 km to 2.2 × 105 km for altitudes between 2.5 R&sun; and 5.5 R&sun;, with the average thickness of 1.4× 105 km, and the speed of magnetic reconnection inflow near the current sheet is about 10 km s-1. These results suggest a magnetic diffusivity of the plasma inside the current sheet to be 0.7 × 1012 m2 s-1 (compared to the classical value for the quiet corona of 1 m2 s-1, and to the corresponding value for the "turbulent plasma" of 3.4× 106 m2 s-1). For the event occurring on November 18, 2003, the data from UVCS indicate that the upper limit of the current sheet thickness at altitude of 1.7 R&sun; is about 2.8 × 104 km, and that the velocity of magnetic reconnection inflow near the current sheet ranges from 10.5 km s-1 to 106 km s-1. Combining these results yields a range of magnetic diffusivity from 1.4× 1011 m2 s-1 to 1.4× 1012 m2 s-1. During the event observed on March 23, 1998, the upper limit of the thickness of the current sheet in the wake of a CME is about 105 km according to data from UVCS. No data for the velocity of the magnetic reconnection near the current sheet in this event were obtained. Considering the fact that this event was more gradual than the other two cases, we assume the inflow speed in this event to be 5 km s-1. So, we obtain that the magnetic diffusivity of the plasma inside the current sheet has an upper limit of 2.5× 1011 m2 s-1. We notice that values of magnetic diffusivity deduced for three different events are within the range of magnitude.
Forbes Terry G.
Ko Yumi
Li Jiying
Lin Juhn-Jong
Raymond John C.
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