Publications by authors named "Kristopher Cooper"
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 Telescope ARray and the Solar Dynamic Observatory's Atmospheric Imaging Assembly and Helioseismic and Magnetic Imager. We find GOES sub-A class equivalent microflare energies of 10-10 erg reaching temperatures up to 10 MK with consistent quiescent or hot active region (AR) core plasma temperatures of 3-4 MK. One microflare (SOL2018-09-09T10:33), with an equivalent GOES class of A0.
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- The study focuses on an extremely weak microflare observed on September 9, 2018, using X-ray imaging spectroscopy tools such as NuSTAR and SDO/AIA.
- The microflare was found to have an energy level three orders of magnitude lower than typical GOES A class microflares, with a temperature of 6.7 MK and a very low emission measure.
- Remarkably, this research provides the lowest thermal energy estimate for an active region microflare reported in literature, pushing the boundaries of what qualifies as an X-ray microflare.