Evidence for Polar X-Ray Jets as Sources of Microstream Peaks in the Solar Wind

Details Evidence for Polar X-Ray Jets as Sources of Microstream Peaks in the Solar Wind Evidence for Polar X-Ray Jets as Sources of Microstream Peaks in the Solar Wind

May 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012apj...750...50n&link_type=abstract

The Astrophysical Journal, Volume 750, Issue 1, article id. 50 (2012).

Astronomy and Astrophysics

Astronomy

Solar Wind, Sun: X-Rays, Gamma Rays

Scientific paper

It is proposed that the interplanetary manifestations of X-ray jets observed in solar polar coronal holes during periods of low solar activity are the peaks of the so-called microstreams observed in the fast polar solar wind. These microstreams exhibit velocity fluctuations of ±35 km s–1, higher kinetic temperatures, slightly higher proton fluxes, and slightly higher abundances of the low-first-ionization-potential element iron relative to oxygen ions than the average polar wind. Those properties can all be explained if the fast microstreams result from the magnetic reconnection of bright-point loops, which leads to X-ray jets which, in turn, result in solar polar plumes. Because most of the microstream peaks are bounded by discontinuities of solar origin, jets are favored over plumes for the majority of the microstream peaks.

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