Outflows at the edges of active regions: Contribution to solar wind formation?

HARRA, L.K.; SAKAO, T.; MANDRINI, C.H.; HARA, H.; IMADA, S.; YOUNG, P.R.; VAN DRIEL-GESTELYI, L.; BAKER, D.

ASTROPHYSICAL JOURNAL

The American Astronomical Society - University of Chicago Press

Año: 2008 vol. 676 p. 147 - 150

0004-637X

The formation of the slow solar wind has been debated for many years. In this Letter we show evidence of persistent outflow at the edges of an active region as measured by the EUV Imaging Spectrometer on board Hinode. The Doppler velocity ranged between 20 and 50 km s^-1 and was consistent with a steady flow seen in the X-Ray Telescope. The latter showed steady, pulsing outflowing material and some transverse motions of theloops. We analyze the magnetic field around the active region and produce a coronal magnetic field model. We determine from the latter that the outflow speeds adjusted for line-of-sight effects can reach over 100 km s^-1. We can interpret this outflow as expansion of loops that lie over the active region, which may either reconnect with neighboring large-scale loops or are likely to open to the interplanetary space. This material constitutes atleast part of the slow solar wind.