Popescu, M. D. ; Banerjee, D. ; O'Shea, E. ; Doyle, J. G. ; Xia, L. D. (2005) Very long period activity at the base of solar wind streams Astronomy & Astrophysics, 442 (3). pp. 1087-1090. ISSN 0004-6361
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Official URL: http://doi.org/10.1051/0004-6361:20053714
Related URL: http://dx.doi.org/10.1051/0004-6361:20053714
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.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to The European Southern Observatory. |
| Keywords: | Sun: Solar Wind; Sun: Transition Region; Sun: Corona. |
| ID Code: | 115770 |
| Deposited On: | 18 Mar 2021 05:23 |
| Last Modified: | 18 Mar 2021 05:23 |
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