Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002soph..207...73c&link_type=abstract
Solar Physics, v. 207, Issue 1, p. 73-85 (2002).
Physics
25
Scientific paper
Canceling magnetic features are commonly believed to result from magnetic reconnection in the low atmosphere. According to the Sweet-Parker type reconnection model, the rate of flux cancellation in a canceling magnetic feature is related to the converging speed of each pole. To test this prediction observationally, we have analyzed the time variation of two canceling magnetic features in detail using the high-resolution magnetograms taken by the Michelson Doppler Imager (MDI) on the Solar and Heliospheric Observatory (SOHO). As a result, we have obtained the rate and converging speed of flux cancellation in each feature: 1.3×10^18 Mx hr^-1 (or 1.1×10^6 G cm s^-1 per unit contact length) and 0.35 km s^-1 in the smaller one, and 3.5×10^18 Mx hr^-1 (1.2×10^6 G cm s^-1) and 0.27 km s^-1 in the bigger one. The observed speeds are found to be significantly bigger than the theoretically expected ones, but this discrepancy can be resolved if uncertainty factors such as low area filling factor of magnetic flux and low electric conductivity are taken into account.
Chae Jongchul
Moon Yong Jae
Wang Haimin
Yun Hong Sik
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