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

Autor:	B. J. I. Bromage, M. S. Marsh, Robert W. Walsh
Rok vydání:	2002
Předmět:	Physics Wavelet Spectrometer Space and Planetary Science Observatory Coronal plane Range (statistics) Coronal hole Astronomy and Astrophysics Emission spectrum Astrophysics Time series
Zdroj:	Astronomy & Astrophysics. 393:649-659
ISSN:	1432-0746 0004-6361
Popis:	High time resolution ( ≈ 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6bc4f6313ad97244d7ea33e46c71da89 https://doi.org/10.1051/0004-6361:20021057 Zobrazit plný text záznamu