145 citations · 1.6k across the 41 of their papers we have counts for
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Peripheral downflows in sunspot penumbrae
Michiel van Noort, Andreas Lagg, Sanjiv Tiwari +1
Sunspot penumbrae show high-velocity patches along the periphery. The high-velocity downflow patches are believed to be the return channels of the Evershed flow. We aim to investig…
Structure of sunspot penumbral filaments: a remarkable uniformity of properties
Sanjiv Kumar Tiwari, Michiel van Noort, Andreas Lagg +1
The sunspot penumbra comprises numerous thin, radially elongated filaments that are central for heat transport within the penumbra, but whose structure is still not clear. To inves…
Vertical flows and mass flux balance of sunspot umbral dots
T. L. Riethmüller, S. K. Solanki, M. van Noort +1
A new Stokes inversion technique that greatly reduces the effect of the spatial point spread function of the telescope is used to constrain the physical properties of umbral dots (…
Physical Properties of a Sunspot Chromosphere with Umbral Flashes
J. de la Cruz Rodríguez, L. Rouppe van der Voort, H. Socas-Navarro +1
We present new high-resolution spectro-polarimetric Ca II 8542 observations of umbral flashes in sunspots. At nearly 0.18", and spanning about one hour of continuous observation, t…