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Category/Subcategory: Natural Sciences/Astronomy

Chromospheric jets above sunspots

Author: Jan Jurcak
In recent years, various chromospheric jet-like phenomena have been discovered in sunspots. There are impulsive penumbral and umbral microjets and slower, longer-lived, and more ubiquitous sunspot dynamic fibrils. Furthermore, sur ... more

Views: 26

Exceptions to the rule: the X-flares of AR 2192 lacking coronal mass ejections

Author: Manuela Temmer
The unusually large NOAA active region (AR) 2192, observed in October and November 2014, was outstanding in its productivity of major flares (GOES class M5 and larger). However, none of the X-flares was associated to a coronal mas ... more

Views: 485

Metallicity effects on granulation in red giants

Author: Remo Collet
Short overview of observed and predicted effects of stellar chemical composition on granulation at the surface of red giant stars.

Views: 94

The joint magnetosphere of the binary system YY Gem

Author: Volkmar Holzwarth
RS CVn- and BY Dra-systems are among the magnetically most active stellar objects known. The magnetic flux generated in the outer convection zone of these rapidly rotating cool stars leads after emergence at the stellar surface to ... more

Views: 301

A stellar context for the solar activity cycle

Author: Travis Metcalfe
Precise photometry from the Kepler space telescope allows not only the measurement of rotation in solar-type field stars, but also the determination of reliable masses and ages from asteroseismology. These critical data have recen ... more

Views: 230

Formation of Molecular Clouds colloquium presentation

Author: Michael Burton
Formation of Molecular Clouds colloquium presentation, 2010

Views: 259

Slipping reconnection in a solar flare observed with GREGOR

Author: Michal Sobotka
A small flare ribbon above a sunspot umbra in active region 12205 was observed on November 7, 2014, at 12:00 UT in the blue imaging channel of the 1.5-m GREGOR telescope, using a 1 A Ca II H interference filter. Context observatio ... more

Views: 296

SRD: Report from WG2

Author: Mats Carlsson
The SRD Working Group 2 has worked within the theme “Wave Coupling Throughout the Solar Atmosphere”. This report will cover the sample science cases the WG2 has worked on, including observing programs and a discussion of trade ... more

Views: 21

Lessons from SST.

Author: Dan Kiselman
The Swedish 1-m Solar Telescope has been operating on La Palma since 2002. Before that, the Swedish solar observatory hosted other solar telescopes for almost 20 years. From this experience we will formulate a number of conclusion ... more

Views: 39