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    Article

    The PLATO 2.0 mission

    PLATO 2.0 has recently been selected for ESA’s M3 launch opportunity (2022/24). Providing accurate key planet parameters (radius, mass, density and age) in statistical numbers, it addresses fundamental questio...

    H. Rauer, C. Catala, C. Aerts, T. Appourchaux, W. Benz in Experimental Astronomy (2014)

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    Chapter

    Properties of High-Frequency Wave Power Halos Around Active Regions: An Analysis of Multi-height Data from HMI and AIA Onboard SDO

    We study properties of waves of frequencies above the photospheric acoustic cut-off of ≈5.3 mHz, around four active regions, through spatial maps of their power estimated using data from the Helioseismic and Magn...

    S. P. Rajaguru, S. Couvidat, Xudong Sun in Solar Dynamics and Magnetism from the Inte… (2014)

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    Article

    Properties of High-Frequency Wave Power Halos Around Active Regions: An Analysis of Multi-height Data from HMI and AIA Onboard SDO

    We study properties of waves of frequencies above the photospheric acoustic cut-off of ≈5.3 mHz, around four active regions, through spatial maps of their power estimated using data from the Helioseismic and Magn...

    S. P. Rajaguru, S. Couvidat, Xudong Sun, K. Hayashi, H. Schunker in Solar Physics (2013)

  4. Article

    Open Access

    Constructing and Characterising Solar Structure Models for Computational Helioseismology

    In local helioseismology, numerical simulations of wave propagation are useful to model the interaction of solar waves with perturbations to a background solar model. However, the solution to the linearised eq...

    H. Schunker, R. H. Cameron, L. Gizon, H. Moradi in Solar Physics (2011)

  5. Article

    Open Access

    Newly Identified Properties of Surface Acoustic Power

    The cause of enhanced acoustic power surrounding active regions, known as the acoustic halo, is not as yet understood. We explore the properties of the enhanced acoustic power observed near disk center from 21...

    H. Schunker, D. C. Braun in Solar Physics (2011)

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    Article

    Constructing Semi-Empirical Sunspot Models for Helioseismology

    One goal of helioseismology is to determine the subsurface structure of sunspots. In order to do so, it is important to understand first the near-surface effects of sunspots on solar waves, which are dominant....

    R. H. Cameron, L. Gizon, H. Schunker, A. Pietarila in Solar Physics (2011)

  7. Article

    Open Access

    Modeling the Subsurface Structure of Sunspots

    While sunspots are easily observed at the solar surface, determining their subsurface structure is not trivial. There are two main hypotheses for the subsurface structure of sunspots: the monolithic model and ...

    H. Moradi, C. Baldner, A. C. Birch, D. C. Braun, R. H. Cameron in Solar Physics (2010)

  8. Article

    Open Access

    Erratum to: Helioseismology of Sunspots: A Case Study of NOAA Region 9787

    L. Gizon, H. Schunker, C. S. Baldner, S. Basu, A. C. Birch in Space Science Reviews (2010)

  9. Article

    Open Access

    Helioseismology of Sunspots: A Case Study of NOAA Region 9787

    Various methods of helioseismology are used to study the subsurface properties of the sunspot in NOAA Active Region 9787. This sunspot was chosen because it is axisymmetric, shows little evolution during 20–28...

    L. Gizon, H. Schunker, C. S. Baldner, S. Basu, A. C. Birch in Space Science Reviews (2009)

  10. No Access

    Chapter

    Helioseismology of Sunspots: A Case Study of NOAA Region 9787

    Various methods of helioseismology are used to study the subsurface properties of the sunspot in NOAA Active Region 9787. This sunspot was chosen because it is axisymmetric, shows little evolution during 20–28...

    L. Gizon, H. Schunker, C. S. Baldner, S. Basu in The Origin and Dynamics of Solar Magnetism (2009)

  11. Article

    Open Access

    Physical Properties of Wave Motion in Inclined Magnetic Fields within Sunspot Penumbrae

    At the surface of the Sun, acoustic waves appear to be affected by the presence of strong magnetic fields in active regions. We explore the possibility that the inclined magnetic field in sunspot penumbrae may...

    H. Schunker, D. C. Braun, C. Lindsey, P. S. Cally in Solar Physics (2008)

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    Chapter

    Physical Properties of Wave Motion in Inclined Magnetic Fields within Sunspot Penumbrae

    At the surface of the Sun, acoustic waves appear to be affected by the presence of strong magnetic fields in active regions. We explore the possibility that the inclined magnetic field in sunspot penumbrae may...

    H. Schunker, D. C. Braun, C. Lindsey in Helioseismology, Asteroseismology, and MHD… (2008)

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    Article

    Variations of the magnetic fields in large solar flares

    We present preliminary results from high resolution observations obtained with the Michelson Doppler Imager (MDI) instrument on the SOHO of two large solar flares of 14 July 2000 and 24 November 2000. We show ...

    H. Schunker, A. -C. Donea in Space Science Reviews (2003)

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    Chapter

    Variations of the Magnetic Fields in Large Solar Flares

    We present preliminary results from high resolution observations obtained with the Michelson Doppler Imager (MDI) instrument on the SOHO of two large solar flares of 14 July 2000 and 24 November 2000. We show ...

    H. Schunker, A.-C. Donea in Advances in Space Environment Research (2003)