Magnetic Field Measurements from Solar-B

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Magnetic Field Measurements from Solar-B

• Information shown here is from Solar-B team
  (including Drs Ichimoto, Kosugi, Shibata,
  Tarbell, and Tsuneta)

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ISAS / NASA / PPARC / ESA
Science - Coronal heating - Coronal structure
/ dynamics - Elementary processes in Magnetic
Reconnection
SOLAR-B
Launch Date Summer 2006 with ISAS
M-V-7 Orbit Sun synchronous altitude
600 km Weight 900 kg
Mission instruments - Optical
Telescope / Vector Magnetograph (SOT)
- X-ray Telescope (XRT) - EUV Imaging
Spectrometer (EIS)
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Key Elements with Solar-B

• Instruments
• Solar Optical Telescope (SOT)
• Largest optical telescope ever to observe the Sun
  from space
• Diffraction-limited (0.2 0.3 arcsec) imaging in
  388 668 nm
• Vector magnetic field measurement at the
  photosphere
• X-Ray Telescope (XRT)
• Highest angular resolution imaging at gt 3 MK
  corona
• Wide temperature coverage from below 1 MK to
  above 10 MK
• EUV Imaging Spectrometer (EIS)
• Precise plasma diagnostics in the 17 21 nm
  25 29 nm ranges
• Continuous observation without interruption for 8
  months a year
• Coordinated observation among the three telescopes

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Solar-B Fields of View
N
EIS (360x512)
E
W
SOT BFI (205x102)
SOTNFI/SP (328x164)
XRT (2048x2048)
S
SOHO/EIT FeXII 195A
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Sensitivity of NFI on polarization and
detection limit of the weak magnetic field
Wavelength (nm) geff Pol. Sensitivity (diagonal element of x) Pol. Sensitivity (diagonal element of x) Detection limit of B (e 0.001, Gauss) Detection limit of B (e 0.001, Gauss) remark
Wavelength (nm) geff V QU Bl Bt remark
MgI 517.2 1.75 0.577 0.452 86 656 Chrom. B
FeI 525.0 3.00 0.266 0.609 18 106 Photos. B
FeI 557.6 0.00 - - - - Photos.Dopp.
NaI 589.6 1.33 0.633 0.297 40 (670) Chrom. Bl
FeI 630.2 2.50 0.526 0.503 12 122 Photos. B
HI 656.3 1.33 0.402 0.073 119 gt2000 Chrom. Str/Dopp.
SOT is now a well calibrated polarization
instrument! ? See poster by Ichimoto etal.
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