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

TL;DR

This paper reports high-resolution observations of small, fast-moving bright blobs in solar filaments and active regions, revealing their dynamic behavior and physical properties through spectral analysis.

Contribution

It introduces the discovery and detailed characterization of small-scale bright blobs in solar structures using high-cadence, high-resolution H-alpha observations.

Findings

Blobs slide along magnetic threads at 45-111 km/s.

Blob lengths increase by a factor of 3 over 1-2 minutes.

Brightest blobs exhibit the highest speeds.

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.