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Observations of vector magnetic fields in flaring active regions

Chen, Jimin and Wang, Haimin and Zirin, Harold and Ai, Guoxiang (1994) Observations of vector magnetic fields in flaring active regions. Solar Physics, 154 (2). pp. 261-273. ISSN 0038-0938.

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We present vector magnetograph data of 6 active regions, all of which produced major flares. Of the 20 M-class (or above) flares, 7 satisfy the flare conditions prescribed by Hagyard (high shear and strong transverse fields). Strong photospheric shear, however, is not necessarily a condition for a flare. We find an increase in the shear for two flares, a 6-deg shear increase along the neutral line after a X-2 flare and a 13-deg increase after a M-1.9 flare. For other flares, we did not detect substantial shear changes.

Item Type:Article
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Wang, Haimin0000-0002-5233-565X
Additional Information:© 1994 Kluwer Academic Publishers. Provided by the NASA Astrophysics Data System. Received 30 December 1993; Revised 12 July 1994. We thank Mr Marc Tamsky for helpful discussions. The study was supported by NSF grants INT-9206863 and ATM-9122023, by NASA grant NAGW-1972, and by ONR grant N00014-89-J-1069. HW acknowledges support from NASA grant NAG5-2090.
Errata:Erratum. Sol Phys 158, 205 (1995).
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-89-J-1069
Subject Keywords:Magnetic Field; Flare; Active Region; High Shear; Neutral Line
Issue or Number:2
Record Number:CaltechAUTHORS:20200519-152432611
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Official Citation:Chen, J., Wang, H., Zirin, H. et al. Observations of vector magnetic fields in flaring active regions. Sol Phys 154, 261–273 (1994).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103330
Deposited By: Tony Diaz
Deposited On:19 May 2020 23:01
Last Modified:02 Jun 2020 18:10

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