28-OCT-03 X 17 onset:09:51 peak:11:10 end:11:24

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28-OCT-03 X 17 onset0951 peak1110
end1124
2
Hudson

• SORCE spacecraft makes precise irradiance
  measurements
• Total Irradiance Monitor (TIM) sees essentially
  all of the radiant energy (total over event 6 x
  1032 ergs)
• G. Kopp et al., paper in preparation

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NOAA 10486 Summary (Gallagher)

• Dates observed 23 Oct - 4 Nov (12 days)
• Maximum area 2680 ?h at W25 (30 Oct)
• Hale/Mount Wilson Class ???
• McIntosh Class Fkc
• Maximum number of spots 94
• Flare numbers 15 C-class, 20 M-class, 8 X-class
• and 3 ?-ray
• Flare rates (flares/day) 1.25 (C-class),
• 1.66 (M-class), 0.66 (X-class)

(Show Peters movies)
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TRACE MOVIE Oct 28
Krucker
5
Oct 28 TRACE RHESSI
Krucker
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TRACE 1600 A - Demoulin, Mandrini, van Driel
Movie 1040 UT to 1255 UT, varying cadence
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TRACE 1600A _at_ 1017, Ribbons/footpoints (and
filament?)
(Demoulin, Mandrini, van Driel)
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HASTA data (Mandrini)
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Oct 28 TRACE RHESSI
Krucker
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Slit Locations during H alpha polarization
measurements (Bianda)

• purple slit position
• green TRACE 195 Å
• yellow and blue RHESSI

11
Magnetic field evolution
(Demoulin, Mandrini, van Driel)

Emerging active region in an old AR successive
emergences of bipoles creating a complex d region
(AR 10486)
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AR 10486 October 28, 2003
2
3
2
3
It is a quadrupolar magnetic region
1
4
High shear region
THEMIS/MSDP (Na D1)
Huairou
DMV
13
Arrows -gt Horizontal component of magnetic field
(shear)
Huairou
(Tilt clockwise by 30 deg.)
DMV
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Pre-event 0905 0956
DMV
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Outline of flare events (Demoulin, Mandrini, van
Driel)
1. 1005-1056 UT Local reconnection due to
emerging flux region (small-scale) 2.
1014-1018 UT and 1047-1058 UT Four ribbons
, global quadrupolar reconnection
(large-scale) 3. 1101 UT X 17 flare with two
ribbons
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Pre-event 1 (1005 1056 UT- and after)
image at 1018 UT (TRACE 195A)
confined event due to the emergence of a small
bipole
DMV
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Small scale reconnection
Extrapolation of the photospheric magnetic field
in a linear force-free approximation (a-0.016
Mm-1) Nearby field-lines have different
connectivity Implies presence of separator
DMV
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Outline of flare events
1. 1005-1056 UT Local reconnection due to
emerging flux region (small-scale) 2.
1014-1018 UT and 1047-1058 UT Four ribbons
, global quadrupolar reconnection
(large-scale) 3. 1101 UT X 17 flare with two
ribbons
DMV
19
Global quadrupolar reconnection
2 min. before the flare
Four ribbons between 1012-1019 UT between
1047-1058 UT
DMV
20
Outline of flare events
1. 1005-1056 UT Local reconnection due to
emerging flux region (small-scale) 2.
1014-1018 UT and 1047-1058 UT Four ribbons
, global quadrupolar reconnection
(large-scale) 3. 1101 UT X 17 flare with two
ribbons
DMV
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Flare X 17 1101 UT 1243 UT TRACE
2
2
3
1
Increase of the magnetic stress motions of
convergence towards the inversion line
4
DMV
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"afterglow"
7.2 104 sfu 7.2 108 Jy
gyro- synchrotron
Benz
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(No Transcript)
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Phoenix-2 Radio spectrum
"afterglow"
decimetric pulsations
drifting structure
gyro- synchrotron
GOES Class X17
gyro- synchrotron
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Phoenix-2 Radio spectrum
decimetric pulsations
decimetric patch