Prominent Photospheric Downflows on Magnetic Neutral Line in a Delta-Type Sunspot

被引：0

作者：

K. Takizawa

R. Kitai

Y. Zhang

机构：

[1] Kyoto University,Kwasan and Hida Observatories

[2] Chinese Academy of Sciences,National Astronomical Observatories

来源：

Solar Physics | 2012年 / 281卷

关键词：

Active regions; Magnetic fields; Photosphere;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

It is known that δ-type sunspot groups have a high flare productivity and produce strong flares. In particular, βγδ type sunspots are the most active type of all. A βγδ active region NOAA 9957 with frequent flux cancellations but without any marked flare activity during its decay phase was studied in this work. Using SOHO/MDI Dopplergrams and magnetograms, we detected continuous prominent downflow motions of 1500 – 1700 m s−1 for several hours on the magnetic neutral line in this region. In the downflow region, penumbral structures were observed to decay. We will interpret and discuss the phenomenon as a case of submergence of the magnetic flux.

引用

页码：599 / 609

页数：10

共 3 条

[1] Prominent Photospheric Downflows on Magnetic Neutral Line in a Delta-Type Sunspot
Takizawa, K.
Kitai, R.
Zhang, Y.
SOLAR PHYSICS, 2012, 281 (02) : 599 - 609
[2] INTERACTIONS BETWEEN NESTED SUNSPOTS .1. THE FORMATION AND BREAKUP OF A DELTA-TYPE SUNSPOT
GAIZAUSKAS, V
HARVEY, KL
PROULX, M
ASTROPHYSICAL JOURNAL, 1994, 422 (02) : 883 - 898
[3] Interactions between nested sunspots - II. A confined X1 flare in a delta-type sunspot
Gaizauskas, V
Mandrini, CH
Demoulin, P
Luoni, ML
Rovira, MG
ASTRONOMY & ASTROPHYSICS, 1998, 332 (01): : 353 - 366

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