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First Detection of Solar Flare Emission in Mid-ultraviolet Balmer Continuum
Heinzel, Petr; Dammasch, Ingolf E.; Schmutz, Werner +8 more
We present the first detection of solar flare emission at mid-ultraviolet wavelengths around 2000 Å by the channel 2 of the Large-Yield RAdiometer (LYRA) on board the PRoject for OnBoard Autonomy 2 mission. The flare (SOL20170906) was also observed in the channel 1 of LYRA centered at the H I Lyα line at 1216 Å, showing a clear non-thermal profile…
Predicting the COSIE-C Signal from the Outer Corona up to 3 Solar Radii
Telloni, Daniele; Andretta, Vincenzo; Del Zanna, Giulio +2 more
We present estimates of the signal to be expected in quiescent solar conditions, as would be obtained with the COronal Spectrographic Imager in the EUV in its coronagraphic mode (COSIE-C). COSIE-C has been proposed to routinely observe the relatively unexplored outer corona, where we know that many fundamental processes affecting both the lower co…
Density Fluctuations in a Polar Coronal Hole
Hahn, Michael; D'Huys, Elke; Savin, Daniel Wolf
We have measured the root-mean-square (rms) amplitude of intensity fluctuations, ΔI, in plume and interplume regions of a polar coronal hole. These intensity fluctuations correspond to density fluctuations. Using data from the Sun Watcher using the Active Pixel System detector and Image Processing on the Project for Onboard Autonomy (Proba2), our …
Brightening and Darkening of the Extended Solar Corona during the Superflares of September 2017
West, Matthew J.; Podladchikova, O.; D'Huys, Elke +3 more
On 2017 September 6 and 10, the strongest X9.3 and X8.2 flares of the decade occurred in the active region NOAA Active Region 12673. During these flares, the Sun Watcher with Active Pixels and Image Processing (SWAP) telescope on board the Project for Onboard Autonomy 2 (PROBA2) satellite registered the unusual alternate brightening and darkening …