NuSTAR observations of a repeatedly microflaring solar active region
SolarAtmos
Kristopher
Cooper
Date Submitted
2019-03-14 21:11:29
University of Glasgow
K. Cooper (University of Glasgow), I. Hannah (University of Glasgow), H. Hudson (University of Glasgow, University of California Berkeley), B. Grefenstette (California Institute of Technology), S. Krucker (University of Applied Sciences and Arts Northwestern Switzerland, University of California Berkeley), D. Smith (University of California Santa Cruz), L. Glesener (University of Minnesota Twin Cities)
We present several microflares from a recently emerged active region, AR12721, that were observed on 2018 September 9-10. Using both the Nuclear Spectroscopic Telescope Array (NuSTAR) and the Solar Dynamics Observatory's Atmospheric Imaging Assembly (SDO/AIA) the temporal, spatial, and spectral evolution of the microflares can be studied to determine the energy released, and the associated heating of the solar atmosphere. NuSTAR is an astrophysical X-ray telescope, with direct imaging spectroscopy providing a unique sensitivity for observing the Sun above 2.5keV. The active region microflares were below GOES A1 equivalent level, and the X-ray emission observed by NuSTAR peaks several minutes earlier than the EUV emission seen by SDO/AIA. From the NuSTAR X-ray spectra, we find that the temperature in some of the microflares reached up to 8MK but even at the time of peak emission the microflares are clearly multi-thermal.
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