Astronomy and Astrophysics – Astronomy
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...534..482t&link_type=abstract
The Astrophysical Journal, Volume 534, Issue 1, pp. 482-489.
Astronomy and Astrophysics
Astronomy
15
Sun: Activity, Sun: Magnetic Fields, Sun: X-Rays, Gamma Rays
Scientific paper
By using Yohkoh soft X-ray images, vector magnetograms, and Hα filtergrams, the brightening event that occurred on 1994 May 18 has been studied in detail. It occurred in a nearly potential large-scale magnetic configuration as shown by the comparison between the magnetic extrapolation (linear force-free field) and the large-scale soft X-ray loops. This event is related to the emergence of a new magnetic flux of about 3×1020 Mx. The impulsive enhancement of the emerging flux occurs about 20 minutes before the peaks of the Hα and soft X-ray brightening and lasts for about 10 minutes. This brightening may be a signature of reconnection taking place between the preexisting nonpotential loops and the new emerging small loops. The magnetic energy provided by reconnection is likely to be stored in the nonpotential loops and the emerging flux as implied by the vector magnetograms. By using the electron temperature and the electron density of the brightening event derived from the analysis of the Yohkoh data, an energy budget has been estimated. The result indicates that the energy needed can be reasonably provided by magnetic reconnection.
Aulanier Guillaume
Démoulin Pascal
Fang Chen
Li Nelson Y.
Sakurai Takashi
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