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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


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

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


EIT波的发现

SOHO/EIT

Thompson et al. (1998)

  • Circular

V=250 km/s

1997 May 12


EIT波和暗区

共生现象


典型特征

Stop at separatrix or CH

( Delannee 2000; Thompson et al. 1999)

Avoid ARs & MILs

(Thompson et al. 1999)


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


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


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), ……


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)


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)


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)


我们的磁拉伸模型

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

250 km/s

775 km/s



Chen, Fang, & Shibata (2005)

其它困惑

EIT wave

Moreton


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

其它困惑

EIT 波在活动区附近加速


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)


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


SDO新时代

SDO movie


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