NEWS, RESOURCES, AND MOST RECENT SOLAR WORKING DRAFTS

(1) Mauna Loa Solar Observatory Newsletter Feb 2009

(2) Introduction to the Solar and Space Weather Research Group (SOS) at Korea

(3) Introduction to a highly-automated electronic archive

(4) Quick overview of most recent drafts on arXiv

Episodic X-ray Emission Accompanying the Activation of an Eruptive Prominence: Evidence of Episodic Magnetic Reconnection

Wei W. Liu, Tong-Jiang Wang, Brian R. Dennis,

Gordon D. Holmansubmitted to ApJ on 11 Feb 2009

Background

> Investigations of prominence eruptions can provide critical clues to physics of CMEs and flares.

(1) Ideal MHD process, such as the kink instability of a flux rope

(2) Nonideal MHD process, where magnetic reconnection (tether-cutting or break-out) plays an important role

> The first detailed investigation of both morphology and spectra of X-ray emission accompanying a prominence eruption.> partially occulted C7.7 flare on 03Apr23

1. Episodic X-ray emission during the activation and rise of the prominence (preheating phase of the flare)

2. Signatures of a vertical current sheet trailing the prominence eruption

Conclusion

1. During preheating phase, there are 3 episodes of morphological changes of the (thermal) X-ray emission from a single source to a double source primarily below the apex of the prominence faster magnetic reconnection or a larger energy release rate, supporting the tether-cutting over the breakout model

2. During the impulsive phase, the energy-dependent structure of X-ray sources & an extending bright EUV ridge the existence of a current sheet trailing the erupting prominence as in CSHKP model

New Views of EIT Wave and CME from STEREO

S. Ma, J. Lin, P. Chen, H. Chen

Proceedings of 10th Asian-Pacific Regional IAUMeeting 2008, 1–2 (2008)

Printed 10 February 2009

Background

> There are still open questions as to EIT wave, such as whether it is “flare-driven” or “CME-driven”

> Some studies (e.g., Thompson 2000) found that some EIT waves may be CME-poor.

> The launch of STEREO may help to find the answer

> 07Dec 7, a small filament led to a B1.4 flare

Weak front in 171 strong in 195; asymmetric about the center at first then becomes more and more symmetric

STEREO B observed the CME in both COR1 and COR2, while STEREO A did not. Nor did SOHO/LASCO

Conclusion

1. No CME associated with the EIT wave in STEREO A, but a contrary result was obtained from STEREO B

2. The CME was very narrow and roughly propagated toward STEREO A, so that it was almost totally blocked by the occulting disk of STEREO A.

3. Whether a CME is observed to associate with an EIT wave depends on the angle at which it is seen and on its brightness.

Evolution of a Coronal Twisted Flux Rope

Nour-Eddine Raouafi

Proceedings of the Hinode 2 meetingSubmitted on 3 Feb 2009

> 2009 ApJL 691, L128