Kinematical characterization of intensity fluctuations observed in STEREO EUVI images: 1. On-disk case

Details Kinematical characterization of intensity fluctuations observed in STEREO EUVI images: 1. On-disk case Kinematical characterization of intensity fluctuations observed in STEREO EUVI images: 1. On-disk case

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh41b1650b&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH41B-1650

Astronomy and Astrophysics

Astrophysics

[7509] Solar Physics, Astrophysics, And Astronomy / Corona

Scientific paper

Enhanced, wavelet processed STEREO/EUVI images reveal intermittent intensity fluctuations traveling outwards along apparently-open field lines nearby active region coronal holes. The phenomenon has been observed and quantified using data from instruments on other missions. However, much debate still exists in the solar community about the physical cause and exact quantitative nature of the fluctuations. The STEREO/EUVI continuous coverage, full-disk imaging allows for the first time a more comprehensive study. In particular, we found that the phenomenon persists for as long as the topological configuration of the source region remains constant. In order to shed light on an understanding of the nature of the fluctuations, we have devised a method to determine the kinematical parameters of these apparent outflows. In this work, we introduce the method, report on the average plane-of-sky speed found for a set of selected dates, infer the true velocity by taking advantage of the STEREO two-point view, and discuss the possible scenarios that can explain the phenomenon.

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