1 2003 October-November CMEs Yang Liu – Stanford University

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Presentation transcript:

October-November CMEs Yang Liu – Stanford University

2 Structure and energy of potential field for AR484, 486, and 488 AR: AR0484 TIME: 19:11 UT on 10/23. Energy (potential field): 3.7E+33 ergs. Cube: 300x300x300 arcsec^3. AR: AR0486 TIME: 12:51 UT on 10/29. Energy (potential field): 4.6E+33 ergs. Cube: 300x300x300 arcsec^3. AR: AR0488 TIME: 22:24 UT on 10/30. Energy (potential field): 2.8E+33 ergs. Cube: 300x300x300 arcsec^3.

3 Cone model for halo CMEs Concept of the cone model was proposed twenty years ago (see, e.g. Howard et al, 1982; Fisher & Munro, 1984); Zhao et al (2002) eventually used this model to determine geometrical and kinematical properties of halo CMEs; Xie et al (2004) improved algorithm for determination of the parameters for the model: they measured the minor axis, major axis of the elliptical projection of the circular cross section of the cone on the plane of sky, and then derive the parameters needed. This work makes use of least-square-fitting technique to determine the parameters for the cone model. In this way, observational information is used sufficiently.

4 Cone model for halo CMEs

5 Half of Angle Width=86±1 Longitude=-34±2 Latitude=0±0

6 Halo CMEs With High Speeds Date (mm/dd/yy) Time (UT) Speed (km/s) Accel. (m/s/s) Speed (cone) Accel. (cone) Width (deg.) Flares (Preliminary) Notes 10/21/0303: AR0484C8/SFN06E3703:34EFR 10/28/0311: AR0486X17/4BS16E0811:10 10/29/0320: AR0486X10/2BS15W0220:49 11/02/0309: backside 11/02/0317: AR0486X8/2BS14W5617:25 11/04/0312: AR0486C611:15 11/04/0319: AR0486X28/3BS19W8919:32 11/06/0317: backside17:24 11/07/0315: AR0486S19W9015:17 11/09/0306: /11/0302: /11/0313: AR0498M1/SFS03W6113:35Small EFR 11/12/0310: /18/0308: AR0501M3.908:12AR /18/0309: M4.509:23

7 Evolution of magnetic field in this period Central meridian: CR2007_290 degree in Longitude (Sept. 4) Central meridian: CR2008_290 degree in Longitude (Oct. 1) Central meridian: CR2009_290 degree in Longitude (Oct. 28) Central meridian: CR2010_290 degree in Longitude (Nov. 25)

8 Evolution of magnetic field in this period Central meridian: CR2007_290 degree in Longitude (Sept. 4) Central meridian: CR2008_290 degree in Longitude (Oct. 1) Central meridian: CR2009_290 degree in Longitude (Oct. 28) Central meridian: CR2010_290 degree in Longitude (Nov. 25) Date (mm/dd/yy) Time (UT) Speed (cone) Accel. (cone) Flares (Preliminary) 10/21/0303: AR0484C8/SF 10/28/0311: AR0486X17/4B 10/29/0320: AR0486X10/2B 11/02/0317: AR0486X8/2B 11/04/0312: AR0486C6 11/04/0319: AR0486X28/3B 11/07/0315: AR /11/0313: AR0498M1/SF 11/18/0308: AR0501M3.9 11/18/0309: M4.5

9 AR0464 (0484, 0501) and large-scale magnetic field

10 AR0486, AR0488 and large-scale magnetic field

11 Extremely fast halo CMEs and active regions Date (mm/dd/yy) Time (UT) Speed (cone) Accel. (cone) Flares (Preliminary) 10/21/0303: AR0484C8/SF 10/28/0311: AR0486X17/4B 10/29/0320: AR0486X10/2B 11/02/0317: AR0486X8/2B 11/04/0312: AR0486C6 11/04/0319: AR0486X28/3B 11/07/0315: AR /11/0313: AR0498M1/SF 11/18/0308: AR0501M3.9 11/18/0309: M4.5 AR0464 (0484, 0501) emerged within/close to an area with large- scale open magnetic field. AR0486, together with AR0488, produced a big open field area after they emerged. The active regions, associated with those high speed halo CMEs in this period, are acting or closed related with sources of open magnetic flux, except AR0498. In this way, open magnetic field provides an avenue for CMEs to blow out. ?

12 AR0498 and large-scale magnetic field

13 Summary The extremely fast halo CMEs in 2003 October-November, originated from active regions, are found to closely related with special configurations of large-scale magnetic fields. A detail description is in follow. –Active regions appeared in an open field area; –Active regions produced a big open field area after they emerged; –Active regions located at the boundary of two open field areas with the same magnetic polarity. The observational results above show that the large-scale magnetic fields related to those events provide a configuration in favor of blow-out of eruptions.