Other
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.0826l&link_type=abstract
American Astronomical Society, SPD meeting #37, #8.26; Bulletin of the American Astronomical Society, Vol. 38, p.235
Other
Scientific paper
Observations and theories continuously provide evidence of formation and development of the reconnecting current sheets during major eruptions. Because the high electric conductivity and the force-free environment of the solar corona, the current sheet is usually confined in a small volume compared to the other structures involved in the eruption in order to allow the energy conversion or magnetic reconnection to take place at a plausible rate. The work investigating the sizes, especially thickness, of the current sheet developed by the eruption in reality was never conducted before since it is believed that the current sheet is too thin to be observable. It has often been stated that the thickness is limited either by the Lamor radius of particles, which is about tens of meters in the coronal environment, or by the mean-free-path of particles in the region where the interaction between particles and ion-acoustic waves occurs. In the latter case, the particle mean-free-path is a few kilometers. Here we use a set of unique observations provided by the UVCS and LASCO experiments on SOHO to determine the thickness, d, and furthermore the electric resistivity, etae, of the current sheets for three eruptive events. We find that d ranges from 1.0 x 104 km to 6.0 x 105 km, and etae from 1.0 x 105 ohm m to 4.0 x 106 ohm m. These values of etae are 12-14 orders of magnitude greater than the classical collisional resistivity, 4-6 orders of magnitude greater than estimates of anomalous resistivity, and even 1-3 orders greater than those often used for solar flares. The existence of such large values for d and etae suggests that large scale turbulent processes are operating within the current sheet. Understanding how a high level of turbulence can develop so rapidly is a challenging goal for future research.
Forbes Terry G.
Ko Yumi
Li Jiying
Lin Jun
Raymond John C.
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