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Title: Statistical detection of propagating waves in a polar coronal hole
Authors: Gupta, G. R
O'Shea, E
Banerjee, D
Popescu, M
Doyle, J. G
Issue Date: 2010
Publisher: Springer
Citation: Hasan, S. S and Rutten, R. T., eds., Magnetic coupling between the interior and atmosphere of the Sun, Proceedings of the conference "Centenary commemoration of the discovery of the Evershed effect" Dec, 2 - 5, 2008, Indian Institute of Astrophysics, Bangalore, India, pp. 433 – 436
Series/Report no.: Astrophysics and Space Science Proceedings;
Abstract: Waves are important in the heating of the solar corona and the acceleration of the solar wind. We have examined a long spectral time series sampling a southern coronal hole, observed on the 25 February 1997 using the SUMER spectrometer onboard SoHO. The observations used the spectra lines NIV 765Å, formed in the transition region, and Ne VIII 770Å, formed in the low corona. The spectra indicate the presence of compressional waves with periods of about 18 min, and also significant power at shorter periods. Using Fourier techniques, we measured the phase delays between the intensity as well as the velocity oscillations in the two lines as a function of frequency. From these measurements we derive the travel time of the propagating oscillations and so the propagation speeds of the waves producing the oscillations. As the measured propagation speeds are subsonic, we conclude that the observed waves are slow magneto-acoustic ones.
Description: Open Access
ISBN: 978-3-642-02858-8
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Appears in Collections:IIAP Publications

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