1 / 22

Observations of Sunspot Groups with Solar Optical Telescope (SOT) SOT による黒点群の観測 Takako T. ISHII

Observations of Sunspot Groups with Solar Optical Telescope (SOT) SOT による黒点群の観測 Takako T. ISHII ( 石井 貴子 ) Kwasan and Hida Observatories, Kyoto-U., JAPAN 京都大学大学院 理学研究科 附属天文台 ishii@kwasan.kyoto-u.ac.jp. Subject : Flare energy storage and release. Question :

fonda
Download Presentation

Observations of Sunspot Groups with Solar Optical Telescope (SOT) SOT による黒点群の観測 Takako T. ISHII

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. Observations of Sunspot Groups with Solar Optical Telescope (SOT) SOT による黒点群の観測 Takako T. ISHII (石井 貴子) Kwasan and Hida Observatories, Kyoto-U., JAPAN 京都大学大学院 理学研究科 附属天文台 ishii@kwasan.kyoto-u.ac.jp

  2. Subject: Flare energy storage and release. Question: What is the common magnetic field configuration to flare-productive active regions ? Method: Study the evolution of active regions. Birth, growth, and decay. Photospheric vector-magnetic field (helicity). Corona (XRT), chromosphere (H-alpha).

  3. Previous works: Schematic model of emerging flux bundles. ・Hida Domeless Solar Telescope (DST) e.g. Kurokawa 1987 Sol. Phys. Ishii et al. 1998 ApJ, 2000 PASJ. ・NOAA 9026 (2000 June) DST/ LaPalma H-alpha TRACE white light, SOHO MDI Kurokawa et al. 2002 ApJ.

  4. Active Region NOAA 5395(1989 March) Twisted magnetic flux bundle model Ishii et al. (1998) ApJ, 499, 898 The most flare-productive region during the last solar cycle 22

  5. C A B June 2 June 5 June 6 Active Region NOAA 4201 (1983 June) Observations by DST have performed for ten days running. High flare activity has been found when (June 5-6) and where the twisted magnetic flux bundles (B, C) emerged. In region A, no flares have occurred. Ishii et al. (2000) PASJ, 52, 337

  6. MDI magnetograms NOAA 9026 (2000 June) Twisted magnetic knot ( Kurokawa et al. 2002 ApJ 572, 598) TRACE white light

  7. On going: Active regions with X-class flares (about 30 ARs) SOHO MDI full disk daily evolution movies (1996 – 2001 done. 2002 in prep.) East-limb  West-limb 11 days Cadence: ・Magnetograms 15 images / day ( one image / 90 min.) OK. ・Intensitygrams 4 images / day ( one image / 6 hours) a little bit poor.

  8. NOAA 9415 (2001 Apr.) 5 X-class flares (e.g. 2001-Apr-10 Asasi-flare) 600 arcsec SOHO / MDI SOHO / MDI magnetograms intensitygrams

  9. SOHO / MDI Full disk Longitudinal magnetogram 1 pixel = about 2 arcsec Solar-B / SOT Vector-magnetogram High resolution NOAA 9415 (Face-on movie) gray scale: intensitygram contour: magnetogram level: 500 Gauss red: positive blue: negative 20 degrees in heliographic coordinate

  10. NOAA 9236 (2000 Nov.) 5 X-class flares 20 degrees in heliographic coordinate TRACE White light SOHO / MDI high-resolution 1 pixel = 0.5 arcsec SOHO / MDI Full disk contour: magnetic field(500 Gauss, red: positive, blue: negative)

  11. Solar-B SOT 1 pixel = 0.08 arcsec Field of View (FOV) ⇒max: 328’’×164’’ SOT FOVmax Full disk Sun

  12. NOAA 9415 2001-Apr-10 01:36 UT X2 flare (Asai-flare) on Apr. 10, 2001.

  13. NOAA 9077 2000-Jul-13 05:55 UT X5 flare on July 14, 2000.

  14. NOAA 9393 2001-Mar-29 00:00 UT The largest region during this cycle. (X20 flare at west limb on Apr. 02, 2001)

  15. NOAA 9393 2001-Mar-30 00:00 UT The largest region during this cycle. (X20 flare at west limb on Apr. 02, 2001)

  16. NOAA 9393 2001-Mar-30 00:00 UT Mosaic The largest region during this cycle. (X20 flare at west limb on Apr. 02, 2001)

  17. NOAA 9236 2000-Nov-23 11:12 UT Fixed FOV (19 hours)

  18. NOAA 9236 2000-Nov-24 06:24 UT Fixed FOV (19 hours)

  19. NOAA 9415 2001-Apr-10 01:36 UT Rotation: 2km/s ⇒ 10 arcsec / 1 hour 60 arcsec ( 6 hours )

  20. Summary FOV can cover whole active region. We need fine pointing management (by OP).

  21. NOAA 7978 1996-Jul-09 13:07 UT X2.6 flare occurred in this region on July 09, 1996.

More Related