Flows and Waves in Braided Solar Coronal Magnetic Structures

Abstract

We study the high frequency dynamics in the braided magnetic structure of an active region (AR 11520) moss as observed by High-Resolution Coronal Imager (Hi-C). We detect quasi periodic flows and waves in these structures. We search for high frequency dynamics while looking at power maps of the observed region. We find that shorter periodicites (30 - 60 s) are associated with small spatial scales which can be resolved by Hi-C only. We detect quasi periodic flows with wide range of velocities from 13 - 185 km/s associated with braided regions. This can be interpreted as plasma outflows from reconnection sites. We also find presence of short period and large amplitude transverse oscillations associated with braided magnetic region. Such oscillations could be triggered by reconnection or such oscillation may trigger reconnection.

6 pages, 5 figures, Accepted for publication in ApJ Letters

References in corpus (8)

• Multi-scale Gaussian normalization for solar image processing
• Structure of solar coronal loops: from miniature to large-scale
• Hi-C & AIA observations of transverse MHD waves in active regions
• Flows and Motions in Moss in the Core of a Flaring Active Region: Evidence for Steady Heating
• Trigger Mechanism of Solar Subflares in a Braided Coronal Magnetic Structure
• Force-free field modeling of twist and braiding-induced magnetic energy in an active-region corona
• Sparkling EUV bright dots observed with Hi-C
• High-resolution observations of active region moss and its dynamics

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• Hi-C 2.1 Observations of Reconnection Nanojets
• Twisting/Swirling Motions During a Prominence Eruption as seen from SDO/AIA
• Effects of external flow on resonant absorption of coronal loop kink oscillations driven by an external fast wave: Selective excitation problem