Summary: Astronomy & Astrophysics manuscript no. 5688 c ESO 2006
September 7, 2006
Transition Region Counterpart of a Moving Magnetic Feature
Chia-Hsien Lin1,2,3,, D. Banerjee4, E. O'Shea1, and J. G. Doyle1
Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland
National Center for Theoretical Sciences, Physics division, National Tsing-Hua University, Hsinchu, Taiwan
Astronomy Department, Yale University, New Haven, CT06511, U.S.A.
Indian Institute of Astrophysics, Koramangala, Bangalore 560034, India
Context. While moving magnetic features have been studied extensively at the photospheric level, the effect they have on the upper atmosphere
remains largely unknown, and it is this which we seek to address in this work.
Aims. In this work we aim to investigate the chromospheric and transition-region dynamics associated with a moving magnetic monopole by
using spectral time-series and images.
Methods. Cross correlation was applied to images taken by different instruments and at different times in order to spatially correlate brightenings
seen at transition region temperatures with moving magnetic features seen in magnetograms. We used wavelet analysis to examine and compare
the periodicities of time-series signals in different regions.