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  1. No Access

    Article

    New Insights into White-Light Flare Emission from Radiative-Hydrodynamic Modeling of a Chromospheric Condensation

    The heating mechanism at high densities during M-dwarf flares is poorly understood. Spectra of M-dwarf flares in the optical and near-ultraviolet wavelength regimes have revealed three continuum components dur...

    Adam F. Kowalski, S. L. Hawley, M. Carlsson, J. C. Allred, H. Uitenbroek… in Solar Physics (2015)

  2. No Access

    Article

    Photon Mean Free Paths, Scattering, and Ever-Increasing Telescope Resolution

    We revisit an old question: what are the effects of observing stratified atmospheres on scales below a photon mean free path λ? The mean free path of photons emerging from the solar photosphere and chromosphere i...

    P. G. Judge, L. Kleint, H. Uitenbroek, M. Rempel, Y. Suematsu, S. Tsuneta in Solar Physics (2015)

  3. Article

    Open Access

    The Interface Region Imaging Spectrograph (IRIS)

    The Interface Region Imaging Spectrograph (IRIS) small explorer spacecraft provides simultaneous spectra and images of the photosphere, chromosphere, transition region, and corona with 0.33 – 0.4 arcsec spatial r...

    B. De Pontieu, A. M. Title, J. R. Lemen, G. D. Kushner, D. J. Akin… in Solar Physics (2014)

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  4. No Access

    Chapter and Conference Paper

    Dual-Line Spectral Imaging of the Chromosphere

    Hα filtergrams are notoriously difficult to interpret, “beautiful to view but not fit for analysis.” We try to remedy this by using the IBIS bi-dimensional spectrometer at the Dunn Solar Telescope at NSO/Sacra...

    G. Cauzzi, K. Reardon, R. J. Rutten… in Magnetic Coupling between the Interior and… (2010)

  5. No Access

    Article

    THE SOLAR Mg II h AND k LINES – Observations and Radiative Transfer Modeling

    This paper presents observations of the MgII h and k lines obtained with the UVSP instrument that flew aboard the SMM satellite. Both spatially averaged and resolved observations are compared with calculated p...

    H. Uitenbroek in Solar Physics (1997)

  6. No Access

    Chapter

    The Upper Photosphere and Lower Chromosphere of Small-Scale Magnetic Features

    We empirically investigate the magnetic and thermodynamic properties of small-scale solar magnetic features in their upper photospheric and lower chromospheric layers. We find that the constraints set by the d...

    S. K. Solanki, J. H. M. J. Bruls, O. Steiner, T. Ayres… in Solar Surface Magnetism (1994)

  7. No Access

    Chapter

    The Granulation Sensitivity Of Neutral Metal Lines

    We discuss the sensitivity of neutral metal lines to the temperature variations imposed by the granulation on the solar atmosphere. We concentrate on the Ni I 676.78 nm line, which the Global Oscillation Netwo...

    J. H. M. J. Bruls, H. Uitenbroek, R. J. Rutten in Solar and Stellar Granulation (1989)