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Transit of Venus Observations From National Solar Observatory

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Transit of Venus Observations From National Solar Observatory. National Solar Observatory Facilities. Dunn Solar Telescope Sunspot, New Mexico, USA D = 76cm, λ =380-1700 nm. McMath-Pierce Telescope Kitt Peak, Arizona, USA D = 160 cm, λ =1000-5000 nm. Transit Conditions – Sacramento Peak.

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slide1

Transit of Venus Observations

From National Solar Observatory

national solar observatory facilities
National Solar Observatory Facilities

Dunn Solar Telescope

Sunspot, New Mexico, USA

D = 76cm, λ=380-1700 nm

McMath-Pierce Telescope

Kitt Peak, Arizona, USA

D = 160 cm, λ=1000-5000 nm

slide4

Interferometric BIdimensional Spectrometer (IBIS)

Dual Fabry-Perot Imaging Spectrometer

P.I. - Fabio Cavallini (INAF/Arcetri)

Facility Instrument at the NSO/Dunn Solar Telescope since 2005

Publication List: http://tinyurl.com/ibis-pubs

Instrument Design: Cavallini, F., 2006, Solar Phys., 236, 415.

Spectral Profile: Reardon, K., Cavallini, F., 2008, A & A, 481, 897.

MTF: Righini, A., Cavallini, F., Reardon, K., 2010, A & A, 515, 85.

References

slide5

Interferometric BIdimensional Spectrometer (IBIS)

  • Spectral Range: 5400 - 8600 Å
  • FWHM: 20-45 mÅ
  • FOV: 98 x 98 arcsec
  • Pixel Size: 0.098 arcsec2/pixel
  • Exposure Times: 20-50 msec
  • Strehl Ratio: ~0.95
  • Frame Rate: 8 – 12 frames/sec
  • Data Rate: ≥ 100 GB/hour (two CCD’s)
  • Application of post-facto image correction techniques:
    • Destretching
    • Speckle Reconstruction
    • Multi-Object Multi-Frame Blind Deconvolution

Spectral resolution ~200,000 – 260,000

  • Available Filters
    • 543.4 – Fe I [g=0]
    • 617.3 – Fe I (SDO/HMI)
    • 630.1/630.2 – Fe I
    • 676.8 – Ni I (MDI ; GONG)
    • 709.0 – Fe I [g=0]
    • 722.4 – Fe II [g=0]
    • 587.6 – He I D3
  • 589.0 – Na D2
  • 589.6 – Na D1
  • 656.3 – Ha
  • 854.2 – Ca II
slide6

Mercury Transit – 06 November 2006

Hα Imaging at Ingress

IBIS/DST

slide7

Mercury Transit – 06 November 2006 – IBIS/DST

Imaging Spectroscopy of planetary transit

Na D2 589.0 nm : Scan range = 1.5 Å : Δλ = 0.009 Å

0.083 arcsec/pixel

slide8

Mercury Transit – 06 November 2006

IBIS/DST Observations of Mercury Exosphere in Na D2

Equivalent

Width

Gaussian

Amplitude

Gaussian

Shift

Gaussian

Width

slide9

IBIS Field of View

Mercury

d=10”

98 x 98 arcsec

slide10

IBIS Field of View

Venus

D=60”

98 x 98 arcsec

spectral line selection for ibis
Spectral Line Selection for IBIS
  • Upper wavelength limit of 8700 Å
  • Need strongest line to improve SNR
  • Need to minimize contamination from other solar or terrestrial spectral lines
  • Pascal Hedelt simulated Venus CO2 absorption spectrum from 780 – 4500 nm
  • Compared simulated spectrum (corrected from vacuum to air wavelengths!) to solar atlas
slide12

Spectra at 870 nm – Noisy Continuum!

Solar + terrestrial atlas spectrum

Simulated Cytherian CO2 spectrum

slide13

Solar, Terrestrial, Cytherian Spectra – 780 nm

Solar + terrestrial atlas spectrum

Simulated Cytherian CO2 spectrum

slide14

Solar, Terrestrial, Cytherian Spectra

IBIS Prefilter Profile

Solar + terrestrial atlas spectrum

Simulated Cytherian CO2 spectrum

imaging of aureole
Imaging of Aureole

Rapid Oscillations of the Solar Atmosphere (ROSA)

http://star.pst.qub.ac.uk/rosa/

Six Andor 1000 x 1000 pixel CCD’s,

30 frames/sec sustained

+ image reconstruction techniques

Will use ROSA to take multiwavelength observations (380 – 500 nm) at high cadence during ingress

Look for wavelength dependence of aureole due to scattering processes

Possible addition of 2k x 2k, 50 fps detector

For higher cadence and resolution

facility infrared imaging spectrograph firs
Facility Infrared Imaging Spectrograph(FIRS)

Full Stokes Spectropolarimetry

Slit scanning

Slit length

Spectral coverage: ~60 Å (λ/250)

Observe same spectral interval as Hedelt et al. 2011?

mcmath pierce telescope nso array camera nac
McMath-Pierce TelescopeNSO Array Camera (NAC)

Full Stokes Spectropolarimetry

1024x 1024, helium cooled, InSb array

Spectral Range: 1.6 –2.5 μm, 4.67 μm

Spectral Resolution: ~50,000 – 70,000

Spectral coverage: ~60 Å

Spectral interval(s) to observe?

1.6 and/or 2.2 μm bands

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