Ground-based support from
NSO/SP
T. Rimmele

Dunn Solar Telescope (DST)
D=76cm•two high order adaptive optics
systems (97 actuators)•Visible and NIR spectropolarimeters•Narrow-band tunable filterswith polarimetry•Spectrograph•High resolution imaging

Speckle
reconstruction
G-bandVw=10m/s;
Vw=10m/s;

fs=300Hz=-3dB BW

fs=130Hz
additional noise
Misalignment??

Model includes:•Fitting error•Aliasing•Bandwidth•WFS noise=0dB BW

Individualsnapshot
G-band430 nm3 secexposure
Tip/tilt on

AO loopon
off

Courtesy of T. Rimmele

DST Instruments
Fixed instrument (10min startup):• Diffraction Limited Spectro-Polarimeter (DLSP)• IR Spectro-Polarimeter (2007)
Instruments requiring setup time:• SPINOR• IBIS• UBF• Horizontal SpectrographDLSP Optical Setup at Port-2

2kx2k G-band speckle imager
1kx1k CaK (1A) imager
WL slit jaw
UBF (optional)

DLSP Setup at Port-2

DLSP• Two resolution modes– 0”.09/pix, FOV 60”– 0.”2/pix FOV 180”
– realtime data processing pipeline (calibration,inversion)• Complementary use:
– Zoom in at higher resolution (if seeing cooperates)– Cover different parts of large active regions– Higher cadence– ….

DLSP Data Reduction• Data product very similar to Solar-B SOT-FPP-SP• Both are spectrograph based• Both measures the full vector field• Both observe at the 630nm line pairSample Calibrated Map

A Sample ME inversion

Universal Birefringent FilterUBF• Lyot filter 160 –250 mA passband• Tunable 450 –750 nm• Filtergrams• Dopplergrams• Magnetograms

FeI 543.4nm integral line absorption
14 secexposureAfternoon seeing conditions.

AR 0486
observedclose to eastlimb

10/24/03
UT 18:14 –UT 19:31

SPINOR
Spectro-Polarimeter for INfrared and OpticalRegions•

Versatile achromatic spectro-polarimeter 430nm –1600nm•

Simultaneous visible and near-infrared operation•

High spatial resolution (~0.25“/pix) using new high-order AO

• 3D structure of magnetic field:• FeI 6302, CaII 8542, HeI 10830• Chromospheric field:• CaII 8542, HeI 10830• Quiet Sun fields:• 1.56 micron lines

Chromospheric polarimetry with SPINOR
3D tomography of a sunspot(phot+chrom) using 2 FeI
and2 CaII lines
yellow: 0 - 800 km
red:
800 - 1600 km

Socas-Navarro (2005)

IBIS - Interometric BIdimensional Spectrometer
Installed at the Dunn Solar Telescope, Sac Peak since June, 2003

Design Considerations:– classical, on-axis Fabry-Perot mounting
indentical instrumental profile over entire field
Wavelength Stability – thermally controlled; 10 m/sec per 10 hours
High Throughput– 1–2 x 102 photons/msec/pixel – texp ~ 20-100 msec
Rapid Tuning– sample entire line with ≥ 20 points in ≤ 10 seconds
High Spectral Purity

IBIS Instrumental Characteristics•Transparency = 15%• Spectral Range = 5500 - 8700 Å• FOV = 80” (diameter)• Spatial scale = (0.083”)2 / pixel• Frame rate = 2–5 frames/sec• Exposure Time = 20-100 msec
• Spectral Resolution = 196,000-274,000• Wavelength Setting Time = < 20 msec
• Minimum Wavelength Step = 4.5–6 mÅCurrent IBIS Wavelength Ranges

Monochromatic Imaging of Fe I 7090 Å, ∆λ 30 mÅ
IBIS Observations

line core

Simulations

Vögler, et al., 2003

Stokes Q Profiles

IBIS Vector PolarimetryO-SPAN Optical Solar Patrol NetworkSPECSSummary• Many opportunities for ground based
support from Sac Peak• Design observing programs that arecomplementary to Solar-B:• What is the best strategy? JOP? Bumping?