Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh41b1651s&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH41B-1651
Astronomy and Astrophysics
Astrophysics
[7509] Solar Physics, Astrophysics, And Astronomy / Corona, [7511] Solar Physics, Astrophysics, And Astronomy / Coronal Holes, [7549] Solar Physics, Astrophysics, And Astronomy / Ultraviolet Emissions
Scientific paper
Coherent quasi-periodic perturbations in brightness along polar plumes have been found with the Extreme ultraviolet Imager Telescope (EIT) onboard the SOlar and Heliospheric Observatory (SOHO). Unfortunately, without the use of high cadence EIT campaigns from SOHO, a systematic study of such phenomenon was not feasible due to the high temporal resolution required for this analysis. The advent of the Solar TErrestrial RElationships Observatory (STEREO) mission with its higher spatial and temporal resolution imagers resolved this issue. The twin Extreme UltraViolet Imagers (EUVI) aboard STEREO allowed for simultaneous, high cadence views of the plume structures from two view points. In our enhanced, wavelet processed STEREO/EUVI images, we have found persistent and quasi-steady intensity fluctuations apparently traveling outward above polar coronal holes. The projected plane-of-sky linear speed ranges from 70 to 150 km/sec for these above-the-limb fluctuations. Additionally, some cases exhibit an acceleration pattern very close to the limb. In this work, we introduce the method developed to systematically measure the kinematical parameters of the phenomenon, we compute several parameters for pre-selected dates, and we discuss the existence of an apparent quasi-periodic pattern observed in the Height-Time maps. Finally, we relate our quantitative findings to previous works.
Baldwin Ken
Howard Russ A.
Stenborg Guillermo A.
Vourlidas Angelos
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