Coronal and Interplanetary Magnetic Fields in October-November 2003 and November 7 2004 CMEs

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Coronal and Interplanetary Magnetic Fields in
October-November 2003 and November 7 2004 CMEs

• Vasyl Yurchyshyn
• Big Bear Solar Observatory,
• http//www.bbso.njit.edu/vayur

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Objective

• We will compare orientations of the
• Photospheric (MDI, BBSO DVMG)
• Coronal (SOHO/EIT, Halpha)
• Interplanetary (ACE)
• magnetic fields in order to understand the
• connection between CMEs and their source
• regions as well as the CME evolution in the
• interplanetary space

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Dst Index In Oct - Nov 2003 and Nov 2004
Oct 28 CME (event I)
Oct 29 CME (event II)
Nov 18 CME (event III)
Nov 7 CME (event IV)
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October 28 2003 X17 flare and CME (event I)
Oct 28 flare1
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ACE Data and MC reconstruction (Qiang Hu)
Ace 29 data
Ejecta Time 10/29 1117 UT 10/30 0349 UT
Cone angle 113 deg Clock
angle 266 deg Axial Field Bz0 45 nT Magnetic
Helicity Negative
GSE Z
Clock angle
GSE Y
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October 28 2003 X17 flare and CME
Oct 28 flare2
MC
MC
HXR sources
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October 29 2003 X10 flare and CME (event II)
Oct 29 flare1
The neutral line and the post-flare loop system
were oriented nearly along the SN line and the
axial magnetic field pointed northward. PFL
system showed signs of negative helicity.
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November 18 2003 M3.9 flare and CME (event III)
Nov 18 flare1
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ACE Data and MC reconstruction (Qiang Hu)
Ace 20 data
Ejecta Time 11/20 0936 UT 11/20 1912 UT
Cone angle 105 deg Clock
angle 311 deg Axial Field Bz0 57 nT Magnetic
Helicity Positive
GSE Z
Clock angle
GSE Y
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November 18 2003 M3.9 flare and CME (event III)
Nov 18 flare2
MC
MC
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November 7 2004 X2.0 flare and CME (event IV)
filament
Nov 7 flare1
1612 UT
1624 UT
1648 UT
Meudon Ha 1209UT
MLSO Ha 1709UT
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November 7 2004 X2.0 flare and CME (event IV)
Nov 7 flare2
Analysis of the data shows that the active region
had predominant negative helicity, while
large-scale magnetic field as well as the
magnetic field in the post flare arcade were
directed eastward.
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November 7 2004 X2.0 flare and CME (event IV)
Nov 7 flare3
10 hours
MC
ACE data show rotation of the Bz (yellow) from
positive to negative (N ? S) and the negative By
(white), which indicates that this NWS MC was
nearly parallel to the earths equator its axial
field was pointed westward and it had negative
helicity.
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Nov 7 2004 CME Possibility I Filament Eruption
Inverse polarity, Left handed (dextral, negative
helicity) NWS filament?
AR 0696
Nov 7 flare4
MC
MC
-
Magnetic flux rope, associated w/ the filament

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Nov 7 2004 CME Possibility II Break Out?
Left handed dextral NWS flux rope or sheared
magnetic field
Nov 7 flare5
Large scale S directed overlaying field
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Summary

• In all cases analyzed here, the orientations of
  the interplanetary helical magnetic fields at 1AU
  were consistent with the orientation and helicity
  of the magnetic field in the source regions
• Moreover, the direction of the axial magnetic
  field in the MCs on October 29 and November 20,
  and less evident in the October 30 MC, are
  closely related to the direction of the axial
  magnetic fields in the associated post-flare
  arcades, which span across the magnetic neutral
  line
• The discrepancy between the orientation of the MC
  on Nov 9, 2004 and in the large-scale fields in
  the associated active region could be explained
  by assuming that
• i) the MC was associated with the erupted
  filament
• ii) a break-out scenario was realized in the
  X2.0 flare event
• iii) the interplanetary CME rotated by about
  180 deg as it traversed across the the space