Magnetic Field Magnetic Field Measurements from Measurements from

Solar-BSolar-BInformation shown here is from Information shown here is from

Solar-B team (including Drs Solar-B team (including Drs Ichimoto, Kosugi, Shibata, Ichimoto, Kosugi, Shibata,

Tarbell, and Tsuneta)Tarbell, and Tsuneta)

Science - Coronal heating - Coronal structure / dynamics - Elementary processes in Magnetic Reconnection

Mission instruments - Optical Telescope / Vector Magnetograph (SOT) - X-ray Telescope (XRT) - EUV Imaging Spectrometer (EIS)

Launch Date: Summer 2006 with ISAS M-V-7Orbit: Sun synchronous altitude ~ 600 kmWeight: ~ 900 kg

SOLAR-BISAS / NASA / PPARC / ESA

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 > 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

EIS (360”x512”)

XRT(2048”x2048”)

E W

S

SOT:NFI/SP(328”x164”)

SOT: BFI(205”x102”)

NSolar-B Fields of ViewSolar-B Fields of View

SOHO/EIT FeXII 195A

Sensitivity of NFI on polarization and detection limit of the weak magnetic field

WavelenWavelengthgth

(nm)(nm)

ggeffeff Pol. SensitivityPol. Sensitivity(diagonal (diagonal

element of x)element of x)

Detection limit Detection limit of of BB

(( = 0.001, = 0.001, Gauss)Gauss)

remarkremark

VV QUQU BBll BBtt

MgI MgI 517.2517.2

1.751.75 0.5770.577 0.4520.452 8686 656656 Chrom. BChrom. B

FeI FeI 525.0525.0

3.003.00 0.2660.266 0.6090.609 1818 106106 Photos. BPhotos. B

FeI FeI 557.6557.6

0.000.00 -- -- -- -- Photos.Dopp.Photos.Dopp.

NaI NaI 589.6589.6

1.331.33 0.6330.633 0.2970.297 4040 (670)(670) Chrom. Chrom. BBll

FeI FeI 630.2630.2

2.502.50 0.5260.526 0.5030.503 1212 122122 Photos. BPhotos. B

HI 656.3HI 656.3 1.331.33 0.4020.402 0.0730.073 119119 >2000>2000 Chrom. Chrom. Str/Dopp.Str/Dopp.

SOT is now a well calibrated polarization instrument! See poster by Ichimoto etal.