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High Resolution Observations of Chromospheric Jets in Sunspot Umbra View all abstracts by submitter

Vasyl Yurchyshyn   Submitted: 2014-04-29 11:35

Recent observations of sunspot's umbra suggested that it may be finely structured at a sub-arcsecond scale representing a mix of hot and cool plasma elements. In this study we report the first detailed observations of the umbral spikes, which are cool jet-like structures seen in the chromosphere of an umbra. The spikes are cone-shaped features with a typical height of 0.5-1.0 Mm and a width of about 0.1 Mm. Their life time ranges from 2 to 3 min and they tend to re-appear at the same location. The spikes are not associated with photospheric umbral dots and they rather tend to occur above darkest parts of the umbra, where magnetic fields are strongest. The spikes exhibit up and down oscillatory motions and their spectral evolution suggests that they might be driven by upward propagating shocks generated by photospheric oscillations. It is worth noting that triggering of the running penumbral waves seems to occur during the interval when the spikes reach their maximum height.

Authors: Yurchyshyn, V., Abramenko, V., Kosovichev, A., and Goode, P.
Projects: Other

Publication Status: Accepted by ApJ
Last Modified: 2014-04-29 12:03
Go to main E-Print page  Magnetic flux concentrations in a polytropic atmosphere  Comparison of Emission Properties of two Homologous Flares in AR 11283  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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