Transit of Venus Observations
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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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Transit of Venus Observations From National Solar Observatory

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Transit of venus observations from national solar observatory

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


Transit conditions sacramento peak

Transit Conditions – Sacramento Peak


Transit of venus observations from national solar observatory

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


Transit of venus observations from national solar observatory

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


  • Transit of venus observations from national solar observatory

    Mercury Transit – 06 November 2006

    Hα Imaging at Ingress

    IBIS/DST


    Transit of venus observations from national solar observatory

    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


    Transit of venus observations from national solar observatory

    Mercury Transit – 06 November 2006

    IBIS/DST Observations of Mercury Exosphere in Na D2

    Equivalent

    Width

    Gaussian

    Amplitude

    Gaussian

    Shift

    Gaussian

    Width


    Transit of venus observations from national solar observatory

    IBIS Field of View

    Mercury

    d=10”

    98 x 98 arcsec


    Transit of venus observations from national solar observatory

    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


    Transit of venus observations from national solar observatory

    Spectra at 870 nm – Noisy Continuum!

    Solar + terrestrial atlas spectrum

    Simulated Cytherian CO2 spectrum


    Transit of venus observations from national solar observatory

    Solar, Terrestrial, Cytherian Spectra – 780 nm

    Solar + terrestrial atlas spectrum

    Simulated Cytherian CO2 spectrum


    Transit of venus observations from national solar observatory

    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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