47 citations · 87 across the 3 of their papers we have counts for
3 papers
No universal connection between the vertical magnetic field and the umbra-penumbra boundary in sunspots
B. Löptien, A. Lagg, M. van Noort +1
Context. It has been reported that the boundary between the umbra and the penumbra of sunspots occurs at a canonical value of the strength of the vertical magnetic field, independe…
A low upper limit on the subsurface rise speed of solar active regions
Aaron C. Birch, Hannah Schunker, Douglas C. Braun +4
Magnetic field emerges at the surface of the Sun as sunspots and active regions. This process generates a poloidal magnetic field from a rising toroidal flux tube, it is a crucial…
Helioseismology with Solar Orbiter
Björn Löptien, Aaron C. Birch, Laurent Gizon +10
The Solar Orbiter mission, to be launched in July 2017, will carry a suite of remote sensing and in-situ instruments, including the Polarimetric and Helioseismic Imager (PHI). PHI…