We investigate the spatial, temporal, and spectral properties of 10 microflares from AR12721
on 2018 September 9 and 10 observed in X-rays using the Nuclear Spectroscopic …

A large sample of active-region-targeted time-series images from the Solar Dynamics
Observatory/Atmospheric Imaging Assembly (AIA), the AIA Active Region Patch database …

Context. Nanoflares are impulsive energy releases that occur due to magnetic reconnection
in the braided coronal magnetic field, which is a potential mechanism for heating the corona …

We observed rapid variability (≲ 60 s) at the footpoints of transient, hot (∼ 8–10 MK) coronal
loops in active region cores, with the Interface Region Imaging Spectrograph (IRIS). The …

Relaxation of braided coronal magnetic fields through reconnection is thought to be a
source of energy to heat plasma in active region coronal loops. However, observations of …

What physical mechanisms heat the outer solar or stellar atmosphere to million-kelvin
temperatures is a fundamental but long-standing open question. In particular, the solar …

Coronal plasma in the cores of solar active regions is impulsively heated to more than 5 MK.
The nature and location of the magnetic energy source responsible for such impulsive …

High-resolution spectral observations of the lower solar atmosphere (chromosphere and
transition region) during coronal heating events, in combination with predictions from …

The outer atmosphere of the Sun is composed of plasma heated to temperatures well in
excess of the visible surface. We investigate short cool and warm (< 1 MK) loops seen in the …

A recent study demonstrated that freedom of convection and strength of magnetic field in the
photospheric feet of active-region (AR) coronal loops, together, can engender or quench …