Observations of vector magnetic fields in flaring active regions

Jimin Chen; Haimin Wang; Harold Zirin; Guoxiang Ai

doi:10.1007/BF00681099

Observations of vector magnetic fields in flaring active regions

Jimin Chen, Haimin Wang, Harold Zirin, Guoxiang Ai

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Abstract

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.

Original language	English (US)
Pages (from-to)	261-273
Number of pages	13
Journal	Solar Physics
Volume	154
Issue number	2
DOIs	https://doi.org/10.1007/BF00681099
State	Published - Oct 1994

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1007/BF00681099

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title = "Observations of vector magnetic fields in flaring active regions",

abstract = "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.",

author = "Jimin Chen and Haimin Wang and Harold Zirin and Guoxiang Ai",

year = "1994",

month = oct,

doi = "10.1007/BF00681099",

language = "English (US)",

volume = "154",

pages = "261--273",

journal = "Solar Physics",

issn = "0038-0938",

publisher = "Springer Netherlands",

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T1 - Observations of vector magnetic fields in flaring active regions

AU - Chen, Jimin

AU - Wang, Haimin

AU - Zirin, Harold

AU - Ai, Guoxiang

PY - 1994/10

Y1 - 1994/10

N2 - 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.

AB - 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.

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U2 - 10.1007/BF00681099

DO - 10.1007/BF00681099

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VL - 154

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JO - Solar Physics

JF - Solar Physics

IS - 2

ER -

Observations of vector magnetic fields in flaring active regions

Abstract

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