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Astronomy & Astrophysics manuscript no. aa2794-05 (DOI: will be inserted by hand later)

Summary: Astronomy & Astrophysics manuscript no. aa2794-05
(DOI: will be inserted by hand later)
Footpoint excitation of standing acoustic waves
in coronal loops
Y. Taroyan1, R. Erdélyi2, J. G. Doyle1, and S. J. Bradshaw3
Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland
e-mail: yat@arm.ac.uk
Space and Atmosphere Research Center, Department of Applied Mathematics, University of Sheffield, The Hicks Building,
Hounsfield Road, Sheffield S3 7RH, UK
Space and Atmospheric Physics Group, Blackett Laboratory, Imperial College London, Prince Consort Road,
London SW7 2BZ, UK
Received 31 January 2005 / Accepted 24 March 2005
Abstract. A new theoretical model for the study of slow standing sausage mode oscillations in hot (T > 6 MK) active region
coronal loops is presented. These oscillations are observed by the SUMER spectrometer on board the SoHO satellite. The model
contains the transition region and the upper chromosphere which enables us to study the entire process of hot loop oscillations ­
from the impulsive footpoint excitation phase to the rapid damping phase. It is shown that standing acoustic waves can be excited
by an impulsive heat deposition at the chromospheric footpoint of a loop if the duration of the pulse matches the fundamental


Source: Armagh Observatory


Collections: Physics