Fast prograde coronal flows in solar active regions

ABSTRACT We report the discovery and characterization of high-speed (>100 km s−1) horizontal flows in solar active regions, making use of the Sun-as-a-star spectroscopy in the range 5–105 nm provided by the EVE (Extreme Ultraviolet Variability Experiment) spectrometers on the Solar Dynamics Obser...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2022-09, Vol.515 (1), p.L84-L88
Main Authors: Hudson, Hugh S, Mulay, Sargam M, Fletcher, Lyndsay, Docherty, Jennifer, Fitzpatrick, Jimmy, Pike, Eleanor, Strong, Morven, Chamberlin, Phillip C, Woods, Thomas N
Format: Article
Language:eng ; nor
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Summary:ABSTRACT We report the discovery and characterization of high-speed (>100 km s−1) horizontal flows in solar active regions, making use of the Sun-as-a-star spectroscopy in the range 5–105 nm provided by the EVE (Extreme Ultraviolet Variability Experiment) spectrometers on the Solar Dynamics Observatory. These apparent flows are persistent on time-scales of days, and are well observed in lines of Mg x, Si xii, and Fe xvi for example. They are prograde, as evidenced directly by blueshifts/redshifts peaking at the east/west limb passages of isolated active regions. The high-speed flow behaviour does not depend upon active-region latitude or solar cycle, with similar behaviour in Cycles 24 and 25.
ISSN:1745-3925
0035-8711
1745-3933
1365-2966
DOI:10.1093/mnrasl/slac079