Very long period activity at the base of solar wind streams

Details Very long period activity at the base of solar wind streams Very long period activity at the base of solar wind streams

Nov 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...442.1087p&link_type=abstract

Astronomy and Astrophysics, Volume 442, Issue 3, November II 2005, pp.1087-1090

Astronomy and Astrophysics

Astrophysics

16

Sun: Solar Wind, Sun: Transition Region, Sun: Corona

Scientific paper

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.

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