Fast Prograde Coronal Flows in Solar Active Regions
Solar and Stellar Astrophysics
2022-08-03 v1
Abstract
We report the discovery and characterization of high-speed (>100 km/s) 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 behavior does not depend upon active-region latitude or solar cycle, with similar behavior in Cycles 24 and 25.
Cite
@article{arxiv.2207.13461,
title = {Fast Prograde Coronal Flows in Solar Active Regions},
author = {Hugh S. Hudson and Sargam M. Mulay and Lyndsay Fletcher and Jennifer Docherty and Jimmy Fitzpatrick and Eleanor Pike and Morven Strong and Phillip C. Chamberlin and Thomas N. Woods},
journal= {arXiv preprint arXiv:2207.13461},
year = {2022}
}