1 / 12

Arkadiy Uralov, Victor Grechnev, George Rudenko, Ilia Rudenko et al.

Nobeyama, 15-16 March, 2006. Collision of active regions visible in microwaves: 17 GHz Neutral Line Source as a “father” of weak and major flares some preliminary output of two week staying in NRO. Arkadiy Uralov, Victor Grechnev, George Rudenko, Ilia Rudenko et al.

karma
Download Presentation

Arkadiy Uralov, Victor Grechnev, George Rudenko, Ilia Rudenko et al.

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Nobeyama, 15-16 March, 2006 Collision of active regions visible in microwaves: 17 GHz Neutral Line Source as a “father” of weak and major flaressome preliminary output of two week staying in NRO Arkadiy Uralov, Victor Grechnev, George Rudenko, Ilia Rudenko et al. Institute of Solar-Terrestrial Physics Irkutsk, Russia Nobeyama Radio Observatory

  2. Two kinds of quasi-stationary compact sources in 17 GHz emission of ARs • Sunspot associated – rather well understood • Neutral Line associated Sources – NLS NLS certainly exist and show possible relation to somefeaturesand phenomena in ARs This is the only established fact

  3. Questions • How do NLS appear and live? • Do they have relation to flares? • To answer these questions, we study evolution of an appropriate AR • The target is AR 10488 during the active period of October/November 2003

  4. AR 488 shows an impressive chain of events • begin • birth of two active regions • their collision  • NLS appears • small flares in NLS • major flare starts in NLS • major flare develops • NLS reappears • end

  5. October - November 2003 487 487 488 488 484 484 486 486 SSRT,  = 5.2 cm, intensity 2003/10/27 02:41 UT SOHO/MDI 6767 Å continuum 2003/10/26 22:24 UT NoRH,  = 1.7cm, intensity 2003/10/27 02:40 UT

  6. MDI magnetograms of AR 10488: red – N, blue – S Oct. 27 Oct. 27 Oct. 28 Oct. 29 Oct. 31 Oct. 29 Oct. 30 Nov. 01 Birth and collision of two ARs AR 488 17 hours after birth collision of AR’s new AR birth NLS

  7. Birth of a Neutral Line Source I17color Br contours Bt color Br contours October~30 October~31 November~1 I17 color |B| contours

  8. Small flares and NLS: most 17 GHz bursts occur in the NLS

  9. 17 & 34 GHz flare starts in the NLS X2.7 flare and NLS NLS sunspot

  10. Summary-I AR 10488 • Collision of two bipolar ARs leads to formation of a quadrupole magnetic structure, which contains an X-point. Its probable location is above the closest contact of dipoles visible in magnetograms. • At this place, NLS at 17 GHz appears and persists. For the first time, we have shown evidence for that. • NLS is noisy. Its noise is a series of small bursts. This noise probably reflects the noise of a current sheet.

  11. Summary-II AR 10488 • The current sheet exists well before major flares. There is no need to create it for the initiation of a flare (which was a problem of some CME+flare models). • The magnetic structure,corresponding to the NLS,was probably located close to the bottom of the current sheet. This is why the major flare started just in the NLS. The presented movie evidences for a connection between 17GHz NLS and major flares.

  12. We acknowledge • Shibasaki San and NSRO for the opportunity to work here under perfect conditions • Staff members of the NSRO for the hospitality • The Fortune for the luck to unexpectedly find what we anticipated

More Related