Small EUV brightenings detected by HRI-EUV on board Solar Orbiter: estimation of their temperature with SDO/AIA, Solar Orbiter/SPICE and Hinode/EIS | Antoine Dolliou
Institut d’Astrophysique Spatiale (IAS), France
Main category
Natural Sciences (Astrophysics and Astrononmy)
The solar corona temperature is maintained to more than 1 MK. One of the main theories of the coronal formation (Parker 1988) suggests that the energy is dissipated into the corona through a high number of impulsive, low energy (10²⁴ ergs) heating events, called “nanoflares”. On 30 May 2020, during its first high temporal and spatial resolutions observations, 1463 small (400 – 4000 km) and short lived (10-100 s) EUV brightenings were detected in the Quiet Sun by the high resolution UV imager HRI-EUV (174 Å) on board Solar Orbiter. These may be the signatures of nanoflare heating. As HRI-EUV is sensitive to both coronal and transition region emission, our goal is to verify if these brightenings indeed do reach coronal temperatures. As spectroscopic data were not available during the 2020 Ma
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Link to the European Solar Physics Online Seminars (ESPOS) webpage:
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