Very long period activity at the base of solar wind streams

Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/686

Title:	Very long period activity at the base of solar wind streams
Authors:	Popescu, M. D Banerjee, D O`Shea, E Doyle, J. G Xia, L. D
Keywords:	Sun: solar wind Sun: transition region Sun: corona
Issue Date:	Nov-2005
Publisher:	EDP Science
Citation:	Astronomy and Astrophysics, Vol. 442, No. 3, pp. 1087 - 1090
Abstract:	Using time series data of spectral lines originating from a wide range of temperatures in the solar transition region, above a polar coronal hole, from SUMER (Solar Ultraviolet Measurements of Emitted Radiation) on SoHO (Solar and Heliospheric Observatory), we report on the detection of very long (≈170 min) periodic intensity fluctuations, above the limb. Our data also reveal long periodicities (10-90 min), previously observed with other SoHO instruments. With the acoustic cut-off frequency implying a maximum allowable period of ≈ 90 min, it is unclear whether these intensity fluctuations are due to waves or are the result of a recurrent magnetic reconnection process.
URI:	http://hdl.handle.net/2248/686
Appears in Collections:	IIAP Publications

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