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Original preprint version of an article accepted for publication in A&A This is an unedited version of a paper accepted in A&A. c ESO 2005
 

Summary: Original preprint version of an article accepted for publication in A&A
This is an unedited version of a paper accepted in A&A. c ESO 2005
To be cited as: A&A preprint doi:10.1051/0004-6361:20053714.
Very long period activity at the base of solar wind streams
M. D. Popescu1,2, D. Banerjee3, E. O'Shea1, J. G. Doyle1 and L. D. Xia4
1
Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland
2
Astronomical Institute of the Romanian Academy, RO-75212 Bucharest 28, Romania
3
Indian Institute of Astrophysics, Koramangala, Bangalore 560034, India
4
School of Earth and Space Sciences, Univ. of Science and Technology of China, Hefei, Anhui 230026, China
e-mail: mdp@arm.ac.uk; dipu@iiap.res.in; eos@arm.ac.uk; jgd@arm.ac.uk; xld@ustc.edu.cn
Preprint online version: July 28, 2005
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

  

Source: Armagh Observatory

 

Collections: Physics