Search for Alfv\'en waves in a bright network element observed in Halpha
J. Koza, P. S\"utterlin, P. G\"om\"ory, J. Ryb\'ak, A. Kucera

TL;DR
This study investigated spectroscopic signatures of Alfvén waves in a solar chromospheric bright network element using Halpha line observations, but found no conclusive evidence of their presence.
Contribution
The paper provides detailed spectroscopic analysis of a bright network element to search for Alfvén wave signatures, applying novel fitting techniques to spectral data.
Findings
Detected significant Dopplershift variations up to 4 km/s.
Observed persistent redshift and asymmetry in Halpha core.
Did not find conclusive evidence of Alfvén waves.
Abstract
Alfven waves are considered as potential transporters of energy heating the solar corona. We seek spectroscopic signatures of the Alfven waves in the chromosphere occupied by a bright network element, investigating temporal variations of the spectral width, intensity, Dopplershift, and the asymmetry of the core of the Halpha spectral line observed by the tunable Lyot filter installed on the Dutch Open Telescope. The spectral characteristics are derived through the fitting of five intensity samples, separated from each other by 0.35 A, by a 4th-order polynomial. The bright network element displays the most pronounced variations of the Dopplershift varying from 0 to 4 km/s about the average of 1.5 km/s. This fact implies a persistent redshift of the Halpha core with a redward asymmetry of about 0.5 km/s, suggesting an inverse-C bisector. The variations of the core intensity up to +-10%…
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Taxonomy
TopicsSolar and Space Plasma Dynamics · Stellar, planetary, and galactic studies · Ionosphere and magnetosphere dynamics
