2003 October-November CMEs

1
2003 October-November CMEs

• Yang Liu Stanford University
• yliu_at_solar.stanford.edu

2
Structure and energy of potential field for
AR484, 486, and 488
AR AR0484 TIME 1911 UT on 10/23. Energy
(potential field) 3.7E33 ergs. Cube
300x300x300 arcsec3.
AR AR0486 TIME 1251 UT on 10/29. Energy
(potential field) 4.6E33 ergs. Cube
300x300x300 arcsec3.
AR AR0488 TIME 2224 UT on 10/30. Energy
(potential field) 2.8E33 ergs. Cube
300x300x300 arcsec3.
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
Cone model for halo CMEs
Half of Angle Width861 Longitude-342 Latitude
00
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) Flares (Preliminary) Flares (Preliminary) Flares (Preliminary) Notes
10/21/03 0354 1484 -124.3 1853 -226.5 36 AR0484 C8/SF N06E37 0334 EFR
10/28/03 1130 2459 -105.2 2319 -135.8 85 AR0486 X17/4B S16E08 1110
10/29/03 2054 2029 -146.5 2093 -186.6 88 AR0486 X10/2B S15W02 2049
11/02/03 0930 2036 -64.2 2235 -139.2 47 backside
11/02/03 1730 2598 -32.4 2986 -193.3 33 AR0486 X8/2B S14W56 1725
11/04/03 1206 1208 -41.2 1020 -40.6 89 AR0486 C6 1115
11/04/03 1954 2657 434.8 2996 -385.5 34 AR0486 X28/3B S19W89 1932
11/06/03 1730 1523 -59.5 1206 -44.5 53 backside 1724
11/07/03 1554 2237 -87.4 2233 -85.0 34 AR0486 S19W90 1517
11/09/03 0630 2008 -128.6 2417 60.6 35
11/11/03 0230 1359 -20.0 1015 4.9 61
11/11/03 1354 1315 -36.6 2436 -340.0 24 AR0498 M1/SF S03W61 1335 Small EFR
11/12/03 1054 1197 5.5 1015 -23.2 60
11/18/03 0850 1660 -3.3 1663 -69.2 57 AR0501 M3.9 0812 AR0484
11/18/03 0950 1824 59.6 2720 210.1 31 M4.5 0923
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)
0464
0488
Central meridian CR2009_290 degree in Longitude
(Oct. 28)
0484
0486
Central meridian CR2010_290 degree in Longitude
(Nov. 25)
0501
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)
0464
Date (mm/dd/yy) Time (UT) Speed (cone) Accel. (cone) Flares (Preliminary) Flares (Preliminary) Flares (Preliminary) Flares (Preliminary)
10/21/03 0354 1853 -226.5 AR0484 C8/SF
10/28/03 1130 2319 -135.8 AR0486 X17/4B
10/29/03 2054 2093 -186.6 AR0486 X10/2B
11/02/03 1730 2986 -193.3 AR0486 X8/2B
11/04/03 1206 1020 -40.6 AR0486 C6
11/04/03 1954 2996 -385.5 AR0486 X28/3B
11/07/03 1554 2233 -85.0 AR0486
11/11/03 1354 2436 -340.0 AR0498 M1/SF
11/18/03 0850 1663 -69.2 AR0501 M3.9
11/18/03 0950 2720 210.1 M4.5
0488
Central meridian CR2009_290 degree in Longitude
(Oct. 28)
0484
0486
Central meridian CR2010_290 degree in Longitude
(Nov. 25)
0501
9
AR0464 (0484, 0501) and large-scale magnetic
field
0464
0464
0464
10
AR0486, AR0488 and large-scale magnetic field
0488
0486
11
Extremely fast halo CMEs and active regions
Date (mm/dd/yy) Time (UT) Speed (cone) Accel. (cone) Flares (Preliminary) Flares (Preliminary) Flares (Preliminary) Flares (Preliminary)
10/21/03 0354 1853 -226.5 AR0484 C8/SF
10/28/03 1130 2319 -135.8 AR0486 X17/4B
10/29/03 2054 2093 -186.6 AR0486 X10/2B
11/02/03 1730 2986 -193.3 AR0486 X8/2B
11/04/03 1206 1020 -40.6 AR0486 C6
11/04/03 1954 2996 -385.5 AR0486 X28/3B
11/07/03 1554 2233 -85.0 AR0486
11/11/03 1354 2436 -340.0 AR0498 M1/SF
11/18/03 0850 1663 -69.2 AR0501 M3.9
11/18/03 0950 2720 210.1 M4.5
AR0486, together with AR0488, produced a big open
field area after they emerged.
AR0464 (0484, 0501) emerged within/close to an
area with large-scale open magnetic field .
?
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
0498
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.