Dynamics of Coronal Bright Points as seen by Sun Watcher using Active Pixel System detector and Image Processing (SWAP), Atmospheric Imaging Assembly AIA), and Helioseismic and Magnetic Imager (HMI)

Abstract

The \textit{Sun Watcher using Active Pixel system detector and Image Processing}(SWAP) on board the \textit{PRoject for OnBoard Autonomy\todash 2} (PROBA\todash 2) spacecraft provides images of the solar corona in EUV channel centered at 174 Å. These data, together with \textit{Atmospheric Imaging Assembly} (AIA) and the \textit{Helioseismic and Magnetic Imager} (HMI) on board \textit{Solar Dynamics Observatory} (SDO), are used to study the dynamics of coronal bright points. The evolution of the magnetic polarities and associated changes in morphology are studied using magnetograms and multi-wavelength imaging. The morphology of the bright points seen in low-resolution SWAP images and high-resolution AIA images show different structures, whereas the intensity variations with time show similar trends in both SWAP 174 and AIA 171 channels. We observe that bright points are seen in EUV channels corresponding to a magnetic-flux of the order of $10^{18}$ Mx. We find that there exists a good correlation between total emission from the bright point in several UV\todash EUV channels and total unsigned photospheric magnetic flux above certain thresholds. The bright points also show periodic brightenings and we have attempted to find the oscillation periods in bright points and their connection to magnetic flux changes. The observed periods are generally long (10\todash 25 minutes) and there is an indication that the intensity oscillations may be generated by repeated magnetic reconnection.

References in corpus (5)

• The SWAP EUV Imaging Telescope Part I: Instrument Overview and Pre-Flight Testing
• The SWAP EUV Imaging Telescope. Part II: In-flight Performance and Calibration
• The structure and dynamics of a bright point as seen with Hinode, SoHO and TRACE
• Acoustic oscillations in a field-free cavity under solar small-scale bipolar magnetic canopy
• The Magnetic Association of Coronal Bright Points

Cited by in corpus (10)

• Observational Evidence of Magnetic Reconnection for Brightenings and Transition Region Arcades in IRIS observations
• Magnetic flux supplement to coronal bright points
• Reciprocatory magnetic reconnection in a coronal bright point
• Evidence for precursors of the coronal hole jets in solar bright points
• Quasi-periodic pulsations in extreme-ultraviolet brightenings
• The Relationship between Solar Coronal X-Ray Brightness and Active Region Magnetic Fields: A Study Using High Resolution Hinode Observations
• Automated analysis of oscillations in coronal bright points
• Relationship between EUV microflares and small-scale magnetic fields in the quiet Sun
• Coronal bright point statistics I. Lifetime, shape, and coronal co-rotation
• Coronal bright point statistics II. Magnetic polarities and mini loops