Alfred de Wijn
(NCAR/HAO)
20/06/2016, 14:20
The Chromosphere and Prominence Magnetometer (ChroMag) is an
instrument with the goal
of quantifying the intertwined dynamics and magnetism of the
solar chromosphere and
in prominences through imaging spectro-polarimetry of the
full solar disk in a
synoptic fashion. The picture of chromospheric magnetism and
dynamics is rapidly
developing, and a pressing need exists for...
Jayant Joshi
(ISP Stockholm)
20/06/2016, 14:50
We studied magnetic field structure of a sunspot penumbra in
the upper chromosphere
and compared it to that in the photosphere. High spatial
resolution
spectropolarimetric observations were recorded with the
1.5-meter GREGOR telescope
using the GREGOR Infrared Spectrograph (GRIS). The observed
spectral domain includes
the upper chromospheric He I triplet at 10830 Å and...
Christopher Nelson
(University of Sheffield & Queen's University Belfast)
20/06/2016, 15:10
Modern high-resolution observations have highlighted the ubiquity of small-scale
structures in sunspot umbrae. Umbral micro-jets, extended bright features which were
originally identified within Ca II H filtergrams, are one interesting example of such
structuring. These bright elongated events have been shown to occur on sub-arcsecond
scales, have lifetimes of the order minutes, and to...