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日冕 EIT 波的观测特征 及其模型. 陈鹏飞 P. F. Chen. 南京大学天文系 [email protected] July 29, 2010 @ Shanghai. 纲要. SOHO 时代:  EIT 波的观测特征  EIT 波的理论模型 STEREO 时代 Hinode 时代 SDO 时代. Moreton 波. Optical Observation. Moreton et al. (1961). Moreton waves are associated with big flares

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日冕EIT波的观测特征

及其模型

陈鹏飞

P. F. Chen

南京大学天文系

[email protected]

July 29, 2010 @ Shanghai


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纲要

SOHO时代:

EIT波的观测特征

EIT波的理论模型

STEREO时代

Hinode时代

SDO时代


Moreton

Moreton波

Optical Observation

Moreton et al. (1961)

Moretonwaves are associated with big flares

Propagation velocity: 500-2000 km/s

Propagation distance: 5105 km

H+0.8Å

Credit: Kyoto University colleagues

Theoretical Explanation

Uchida (1968; 1974):

Fast-mode wave in the corona


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EIT波的发现

SOHO/EIT

Thompson et al. (1998)

  • Circular

V=250 km/s

1997 May 12


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EIT波和暗区

共生现象


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典型特征

Stop at separatrix or CH

( Delannee 2000; Thompson et al. 1999)

Avoid ARs & MILs

(Thompson et al. 1999)


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争论焦点

1. 谁驱动了EIT波?

耀斑 vs. CME

2. EIT波的本质是什么?

快波、慢波,还是非波


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1. 驱动源之争

耀斑起源

Wu et al. (2001),Warmuth et al. (2004), Vrsnak et al. (2002), Vrsnak et al. (2006) ……

理由:

表象

+ Uchida (1968)的误导


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1. 驱动源之争

CME起源

Thompson et al. (2000), Biesecker et al. (2002), Kay et al. (2003), Cliver et al. (2005), Chen et al. (2002, 2005) , Chen (2006)

理由:

只要有EIT波,便有CME

Biesecker et al. (2002)

一半EIT波对应B级耀斑

Cliver et al. (2005)

若无CME,虽X级耀斑无EIT波

Chen (2006)

EIT波旋转与暗条旋转一致

Attril et al. (2007)

EIT波与CME亮环重合

Chen (2009)


2 eit

2. EIT波本质之争

Slow-mode wave

VEIT>Cs

MHD waves

density

Alfven wave

Fast-mode wave

?


2 eit1

2. EIT波本质之争

快波模型

coronal Moreton wave

Thompson et al. (1998)

Y.-M. Wang (2000)

Wu et al. (2001)Zheng et al. (2002)

Ofman (2003) Warmuth & Mann (2005), Grechnev et al. 2008; Pomoell et al. (2008), Veronig et al., (2008), Gopalswamy et al. (2009), Long et al. (2009), Patsourakos et al., 2009; Kienreich et al. (2009), ……


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快波模型的缺陷

1. VEIT仅日冕快波的 ~1/3

Klassen et al. (2000)

Eto et al. (2002)

Wills-Davey et al. (2007)

Moreton waves

2. EIT波停在磁分隔面处

Delannee & Aulanier (1999)

Thompson et al. (1999)

Delannee et al. (2009)

Attril (2010)


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快波模型的缺陷

3. VEIT 和Vtype II burst无相关性

Klassen et al. (2000)

4. VEIT << 日冕声速

Long et al. (2009)

Zhukov et al. (2009)


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快波模型的缺陷

5. EIT波在活动区附近加速

Long et al. (2009)

6. 在暗区存在强外流

Harra & Sterling (2003)

7. EIT波和CME亮环重合

Chen (2009)

Dai et al. (2009)


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我们的磁拉伸模型

Chen, Wu, Shibata, & Fang 2002, ApJ, 572, L99

250 km/s

775 km/s


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我们的磁拉伸模型

t1

t2

t3

t2


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Chen, Fang, & Shibata (2005)

其它困惑

EIT wave

Moreton


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Chen (2009, Sci. in China (G), 52, 1785)

其它困惑

EIT 波在活动区附近加速


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EIT波的全面图像

Chen et al. (2002)

1. Coronal Moreton waves

due to piston-driven shock

2. Diffuse “EIT waves”

due to successive opening of

closed field lines.

Harra & Sterling (2003)


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EIT波的其它模型

逐步磁重联模型

Attril et al. (2007)

Wills-Davey et al. (2007), Wang et al. (2009)

慢(孤立)波模型

See

Wills-Davey & Attrill (2009) and Gallagher & Long (2010)

for reviews


Stereo

STEREO时代

Patsourakos et al. (2009a, 2009b)

认为找到快波的证据

Gopalswamy et al. (2009)

认为发现了EIT波的反射

否认了EIT波的反射

Attril et al. (2010):


Stereo1

STEREO时代

Cohen et al. (2009)


Stereo2

STEREO时代

Yang & Chen (2010, Solar Phys.)

EIT波速与当地磁场反相关:

不支持快波模型,能被我们的磁拉伸模型解释


Hinode

Hinode时代

Chen, Ding, Chen (2010, ApJ, in press)

外流出现在暗区内;

谱线增宽出现在暗区边缘


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SDO新时代

SDO movie


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