SMALL-SCALE, DYNAMIC BRIGHT BLOBS IN SOLAR FILAMENTS AND ACTIVE REGIONS

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 spectropolarimeter provides spectral information of these structures. The blobs slide along t...

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Bibliographic Details
Published in:The Astrophysical journal 2012-03, Vol.747 (2), p.1-8
Main Authors: LIN, Y, ENGVOLD, O, ROUPPE VAN DER VOORT, L. H. M
Format: Article
Language:English
Subjects:
Astronomy
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
CHROMOSPHERE
Dynamics
Earth, ocean, space
Elongation
Emission
Exact sciences and technology
Heating
MAGNETOHYDRODYNAMICS
PHOTON EMISSION
Small scale
SOLAR ACTIVITY
Space telescopes
SPATIAL RESOLUTION
Spectra
SUN
TELESCOPES
Tuning
Wavelengths
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Summary: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 spectropolarimeter provides spectral information of these structures. The blobs slide along thin magnetic threads at speeds in the range from 45 km s super(-1) to 111 km s super(-1). The blobs have a slightly elongated shape and their lengths increase by a factor of three from close to half an arcsecond when they first appear until they disappear one to two minutes 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 super(-1), which implies 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.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637x/747/2/129