Small-scale, Dynamic Bright Blobs in Solar Filaments and Active Regions

Abstract

High cadence high spatial resolution observations in H-alpha with the Swedish 1-m Solar Telescope on La Palma have revealed the existence of small-scale highly dynamic bright blobs. A fast wavelength tuning spectro-polarimeter provides spectral information of these structures. The blobs slide along thin magnetic threads at speeds in the range from 45 km/s to 111 km/s. The blobs have a slight elongated shape and their lengths increase by a factor of 3 from close to 1/2 arcsec when they first appear till they disappear 1-2 min later. The brightest blobs show the highest speed. The widths of the H-alpha line emission of the blobs correspond to non-thermal velocities in the plasma less than 10 km/s which imply that they are not the result of shock driven heating. The dynamic character of the bright blobs is similar to what can be expected from an MHD fast mode pulse.

Accepted by ApJ

References in corpus (5)

• CRISP Spectropolarimetric Imaging of Penumbral Fine Structure
• High Resolution Observations and Modeling of Dynamic Fibrils
• Observing the fine structure of loops through high resolution spectroscopic observations of coronal rain with the CRISP instrument at the Swedish Solar Telescope
• Propagation of sausage soliton in the solar lower atmosphere observed by Hinode/SOT
• Measurements of plasma motions in dynamic fibrils

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• Radiative transfer in cylindrical threads with incident radiation VII. Multi-thread models
• Implications of spicule activity on coronal loop heating and catastrophic cooling