Observations of the propagation and photospheric source of waves at the upper transition region footpoints of coronal loops

Details Observations of the propagation and photospheric source of waves at the upper transition region footpoints of coronal loops Observations of the propagation and photospheric source of waves at the upper transition region footpoints of coronal loops

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....5890d&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #5890

Physics

Scientific paper

We study the lower and upper transition region (TR) at the footpoints of coronal loops anchored in active region plage. Using wavelet analysis, we look for the presence of waves in images of C IV 1550 A (0.1 MK) and Fe IX/X 171 A (1 MK) taken with the Transition Region and Coronal Explorer (TRACE). We present several examples of strong intensity oscillations in active region plage at varying temperatures, and study wave power as a function of wave period, as well as propagation effects. We also show, for the first time, an example of correlated oscillations of the upper TR at the opposite ends of a coronal loop, and use this to determine magnetic connectivity, propagation speed and coronal properties. Co-aligned spectra from the SOHO/SUMER spectrometer are used to determine whether correlated velocity oscillations are also present. Co-aligned photospheric dopplergrams taken with SOHO/MDI help us shed light on the possible source of these waves. We find several examples of a correlation between photospheric and upper TR oscillations, which has not been observed before in active region plage. We discuss a theoretical model that can explain such coupling of global helioseismic acoustic oscillations into the upper TR or corona through the mechanism of resonant absorption.

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