EDP Sciences
Free Access
Volume 393, Number 2, October II 2002
Page(s) 649 - 659
Section The Sun
DOI https://doi.org/10.1051/0004-6361:20021057
Published online 23 September 2002

A&A 393, 649-659 (2002)
DOI: 10.1051/0004-6361:20021057

A wavelet analysis of quasi-periodic variability across a solar coronal hole region

M. S. Marsh, R. W. Walsh and B. J. I. Bromage

Centre for Astrophysics, University of Central Lancashire, Preston, PR1 2HE, UK

(Received 3 May 2002 / Accepted 18 July 2002)

High time resolution ( $\approx$13 s cadence) Solar and Heliospheric Observatory (SOHO) Coronal Diagnostic Spectrometer (CDS) Grazing Incidence Spectrometer (GIS) time series data is analysed for evidence of quasi-periodic variability in the solar corona. The observations are obtained from a GIS study of a coronal hole boundary region taken in October 1997. A wavelet analysis is applied to EUV emission lines covering a temperature range of $\log T_{\rm e}=$ 5.3-6.1 K. Wavelet analysis allows the frequency and temporal information of any periods present within the data to be analysed. Statistically significant periods are found within the range 100-900 s and 1500 s. Observations of short wavepackets with periods of the order 50-100 s with durations of 2-5 cycles are reported. Observations of a decay in the driving period over time are also described.

Key words: Sun: corona -- Sun: oscillations -- Sun: transition region -- Sun: UV radiation -- waves

Offprint request: M. S. Marsh, mmarsh@uclan.ac.uk

© ESO 2002

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.