MultiWavelength Studies of Flare Activities with SolarB

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Multi-Wavelength Studies of Flare Activities with
Solar-B

• ASAI Ayumi
• Kwasan Observatory, Kyoto University
• Solar-B Science Meeting _at_ISAS
• February 4, 2003

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Magnetic Reconnection Model
Magnetic Reconnection elemental process for solar
flares
To solve the mechanism, quantitative studies are
needed. ? Solar-Bs target
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Todays Topic

• Using various phenomena, we derive the
  information about the energy release via
  reconnection.
• I present the estimation of the energy release
  rate at flares, by multi-wavelength studies of
  flares.
• Analyzed flares
• 2000-April-10 Flare (X2.3)
• 2002-July-23 Flare (X4.8)
• 2000-November-24 Flare (X2.3)
• ?Suggestion for the observations with Solar-B

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Energy Release Rate
Time profiles of HXR and microwave intensities
are well fitted with that of dE/dt
Energy Release Rate
Reconnection model indicates
I estimate the energy release rate, and compare
it with nonthermal light curves.
Bc coronal magnetic field strength vin inflow
velocity A area of the reconnection region
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Data
Observational Data Ha??Kwasan Observatory,
Sartorius Telescope EUV??TRACE
(171, 195Å image) magnetogram??SOHO /
MDI hard-X ray??Yohkoh / HXT
RHESSI HXRS
(Czech) microwave??Nobeyama Radioheliograph
Sartorius Telescope
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2001-April-10 Flare
Flare I April 10, 2001 0510 UT GOES X2.3
class
NOAA 9415
West
East
Ha images taken with Sartorius Telescope
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Features of the Flare
NoRH
Microwave and HXR light curves show some
bursts. The spatial distributions of Ha kernels
are different from those of HXR sources.
GOES
HXT
Sartorius
HXR sources
Ha image
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Evolution of Flare Ribbons
Neutral Line
I estimate the reconnection rate vB, and the
Poynting flux vB2 as the representations of the
energy release rates.
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Reconnection Rate and Poynting Flux
microwave
HXR
An HXR burst occurred on the slit (0519 UT).
reconnection rate
Poynting flux
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Reconnection Rate and Poynting Flux
microwave
HXR
reconnection rate
An HXR burst occurred on the slit (0526 UT).
Poynting flux
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Summary I

• I have estimated the energy release rate from the
  separation motions of Ha two ribbons and the
  photospheric magnetic field strengths.
• The estimated reconnection rate and the Poynting
  flux along each slit show good correlation with
  nonthermal burst.

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2002-July-23 Flare
Flare II July 23, 2002 0015 UT GOES X4.8
class NOAA 0039
East
West
EUV(195Å) images taken with TRACE
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Down Flow
Time slice image
TRACE 195A
The timings of the down flows correspond to
microwave/HXR bursts.
microwave (NoRH 17GHz)
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2000-November-24 Flare
This flare shows many plasmoid ejections, and
each of them is ejected at the time corresponding
to the HXR burst. Takasaki (2003)
Time slice image
Yohkoh/SXT
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Summary II

• Down flow motions and plasmoid ejections show
  some correlations with HXR/microwave bursts.
• Strongly depend on the reconnection process.
• More quantitative studies are still needed.

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Observation with Solar-B
Ha images with high spatial resolution Magnetogram
s with high spatial resolution

• SOT
• XRT
• EIS
• collaboration with other satellite and ground
  based instruments
• Hida Obs., Nobeyama,
  RHESSI

Observation of reconnection outflow, and density
and temperature of the plasma
Velocity field of the reconnection outflow