High-frequency oscillations in small chromospheric bright features observed with Atacama Large Millimetre/Submillimetre Array

J. C. Guevara Gómez, S. Jafarzadeh, S. Wedemeyer, M. Szydlarski, M. Stangalini, B. Fleck, P. H. Keys

Research output: Contribution to journalArticlepeer-review

3 Downloads (Pure)

Abstract

We report detection of oscillations in brightness temperature, size and horizontal velocity of three small bright features in the chromosphere of a plage/enhanced-network region. The observations, which were taken with high temporal resolution (i.e. 2 s cadence) with the Atacama large millimetre/ submillimetre array (ALMA) in Band 3 (centred at 3 mm; 100 GHz), exhibit three small-scale features with oscillatory behaviour with different, but overlapping, distributions of period on the order of, on average, 90 ± 22 s, 110 ± 12 s and 66 ± 23 s, respectively. We find anti-correlations between perturbations in brightness, temperature and size of the three features, which suggest the presence of fast sausage-mode waves in these small structures. In addition, the detection of transverse oscillations (although with a larger uncertainty) may also suggest the presence of Alfvénic oscillations which are likely representative of kink waves. This work demonstrates the diagnostic potential of high-cadence observations with ALMA for detecting high-frequency magnetohydrodynamic waves in the solar chromosphere. Such waves can potentially channel a vast amount of energy into the outer atmosphere of the Sun. This article is part of the Theo Murphy meeting issue ‘High-resolution wave dynamics in the lower solar atmosphere’.
Original languageEnglish
JournalPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Volume379
Issue number2190
Early online date21 Dec 2020
DOIs
Publication statusPublished - 08 Feb 2021

Keywords

  • General Engineering
  • General Physics and Astronomy
  • General Mathematics

Fingerprint

Dive into the research topics of 'High-frequency oscillations in small chromospheric bright features observed with Atacama Large Millimetre/Submillimetre Array'. Together they form a unique fingerprint.

Cite this