Very long period activity at the base of solar wind streams

Autor:	Dipankar Banerjee, Lidong Xia, M. D. Popescu, E. O'Shea, J. G. Doyle
Rok vydání:	2005
Předmět:	Physics Solar observatory Solar transition region Coronal hole Astronomy and Astrophysics Coronal loop Astrophysics Corona Solar wind Space and Planetary Science Physics::Space Physics Coronal mass ejection Astrophysics::Solar and Stellar Astrophysics Heliosphere
Zdroj:	Astronomy & Astrophysics. 442:1087-1090
ISSN:	1432-0746 0004-6361
DOI:	10.1051/0004-6361:20053714
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1829bb05f5cfc23d3fbf151b3d3a2335 https://doi.org/10.1051/0004-6361:20053714 Zobrazit plný text záznamu