The Morphology and Kinematics of a Globally Propagating Disturbance Observed in the Chromosphere and low Corona

Physics

Scientific paper

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7507 Chromosphere, 7509 Corona, 7549 Ultraviolet Emissions

Scientific paper

The changing morphology and kinematics of a globally propagating disturbance (also known as an "EIT wave") is discussed using Extreme UltraViolet Imager (EUVI) images from Solar Terrestrial Relations Observatory (STEREO). The velocity and acceleration of the disturbance were obtained from running difference images from all four EUVI passbands (171~Å, 195~Å, 284~Å and 304~Å). We show for the first time that a large-scale propagating disturbance has similar morphology and kinematics through the chromosphere and low corona. Finally, the image cadence was found to have a major effect on the measured velocity and acceleration of a disturbance, implying that previously measured values (e.g., using EIT) may have been underestimated.

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