The goal of the study : To localize sources of the quasi-stationary slow solar wind. Method:
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PROBA 2 Guest Investigator project (2010-2012)PROBA 2 Guest Investigator project (2010-2012)
EUV imaging of the solar EUV imaging of the solar corona and study of slow solar corona and study of slow solar
wind streams wind streams
V. Slemzin. Slemzin11, L. Harra, L. Harra22, S. Kuzin, S. Kuzin11, A. Urnov, A. Urnov11, F. , F. GoryaevGoryaev11, , 11LPI, Russia, LPI, Russia, 22MSSL/UCL MSSL/UCL
PROBA 2/SWAP teamPROBA 2/SWAP team
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The goal of the study :
To localize sources of the quasi-stationary slow solar wind.
Method:
Some of the sources may be localized by outflows from active regions detected by the Doppler spectroscopy, their signatures in the corona co-aligned with open field lines and imprints in the slow solar wind.
Coronal signatures: fan rays at the disk and extended coronal rays at the limb.
First part of the study (2010-2011) :
1) imaging of the solar corona with SWAP
2) detection of outflows at the disk with Hinode/EIS
3) identification of coronal signatures of outflows
4) search of imprints of outflows in the solar wind data.
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1. Wide FOV imaging of the inner corona with 1. Wide FOV imaging of the inner corona with SWAPSWAP1. Paving ±10’
2. Summation of 80-90 images in each position Cadence 30 s Full time of observation ~ 3h
3. Straylight subtraction using the eclipse images
4. Combination of a mosaic image
Straylight model(linear Log fit to the radial distribution at R>2Rsun)
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08 July 2010
20 October 2010 21 October 2010
8 July 2010 1.94 Rsun
01 Dec 2010 2.10 Rsun
The length of coronal rays is defined by Ne at the base and radial velocity.
If V≥ 60 km/s, the rays are not seen at R>1.5Rsun due to Doppler dimming
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AIA 171 September 12, 2011 SWAP 174
AIA vs AIA vs SWAPSWAP
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AIA 171 A:- Limited FOV- Higher resolution
SWAP 171 A:-Wider FOV- lower straylight
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2. 2. Detection of outflows with Hinode/EISDetection of outflows with Hinode/EIS
Out
flow
do
wnf
low
EIS, October 15, 2010
Zoomed SWAP and PFSS in the EIS FOV
AR 11112
SWAP
PFSS
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3. Coronal rays as main signatures of outflows3. Coronal rays as main signatures of outflows
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SWAP, March 23, 2011
SWAP April 6, 2011
Outflow region
EIS, March 23, 2011
EIS, April 4, 2011
Outflow region
AR 11176
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PFSS April 6, 2011
LASCO C2, April 6, 2011
LASCO and SWAP polar images at W-limb (April 6, 2011)
The streamer corresponds to the outflow position at the limb
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4. Imprints of outflows in the solar wind data4. Imprints of outflows in the solar wind data(October 2010)(October 2010)
Positions of STEREO A , - B , ACE and WIND on 2010-10-15 12:00 UT
ACE/WIND
Oct 15, 2010
Oct 13-14Δt=4.3d
Oct 18-19Δt=4.2d
Oct 26-29Δt=6.3d
Variation of the solar wind flux correlates with temporal evolution of the AR
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ConclusionIt was shown that outflows in active regions detected at the disk in
the Fe lines with Texc~1 MK can produce extended coronal
structures coaligned with open field lines and imprints in the slow
solar wind.
Publication: Slemzin , Harra et al. Submitted To Solar Phys.
Two main advantages of SWAP to detect coronal signatures of
the plasma flows:
1.Large field of view
2.Wavelength band 174 A (FeIX-X) is optimal to see structures with
T~1MK responsible for plasma transit from the Sun to the solar wind
. It is confirmed by domination of the FeXI ions in the solar wind
(Habbal et al. 2007, 2010)
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N
S
0
180
90270
Second part of the study (2011-2012):Second part of the study (2011-2012):
Long term evolution of the EUV corona. Long term evolution of the EUV corona. Comparison of coronal and magnetic synoptic Comparison of coronal and magnetic synoptic
mapsmaps
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Polar movie of the corona during 1 Polar movie of the corona during 1 rotationrotation
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Variation of the synoptic maps of the Variation of the synoptic maps of the corona with distance R=1.00 – 1.67 corona with distance R=1.00 – 1.67
RsunRsun
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3. Comparison with the WSO synoptic maps of magnetic field.
Photospheric field
R=1.00 Rsun
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R=1.66 Rsun
Source surface at 2.5 Rsun
Lee et al. 2011:In the min of 22-23 cycles SS is located at 1.9 – 1.5 Rsun