Hudson, H. S. , Mulay, S. M. , Fletcher, L. , Docherty, J., Fitzpatrick, J., Pike, E., Strong, M., Chamberlin, P. C. and Woods, T. N. (2022) Fast prograde coronal flows in solar active regions. Monthly Notices of the Royal Astronomical Society: Letters, 515(1), L84-L88. (doi: 10.1093/mnrasl/slac079)
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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.
| Item Type: | Articles |
|---|---|
| Additional Information: | SMM and LF acknowledge support from the UK Research and Innovation’s Science and Technology Facilities Council under grant award number ST/T000422/1. PCC and TNW were supported by NASA contract number NAS5-02140. |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Fletcher, Professor Lyndsay and Mulay, Dr Sargam and Hudson, Dr Hugh and Docherty, Miss Jennifer |
| Authors: | Hudson, H. S., Mulay, S. M., Fletcher, L., Docherty, J., Fitzpatrick, J., Pike, E., Strong, M., Chamberlin, P. C., and Woods, T. N. |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Journal Name: | Monthly Notices of the Royal Astronomical Society: Letters |
| Publisher: | Oxford University Press |
| ISSN: | 1745-3925 |
| ISSN (Online): | 1745-3933 |
| Published Online: | 23 July 2022 |
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