INVESTIGADORES
MANDRINI Cristina Hemilse
congresos y reuniones científicas
Título:
Magnetic reconnection along QSLs - a major driver of active region outflows
Autor/es:
BAKER, D.; VAN DRIEL-GESZTELYI, L.; MANDRINI, C.H.; DÉMOULIN, P.
Lugar:
Bremen
Reunión:
Congreso; 38th COSPAR Scientific Asssembly; 2010
Institución organizadora:
Committee on Space Research
Resumen:
The relationship between quasi-separatrix layers (QSLs), or in the limit
of infinitely thin QSLs, separatrices, and various activity phenomena
has been explored in many different solar magnetic configurations across
all scales in recent years. In the absence of magnetic nulls, fast
reconnec-tion along QSLs, which are specific locations in the magnetic
topology where field lines display strong gradients of magnetic
connectivity, was identified as the main physical process at the origin
of flares. Recently, it was shown that fast (tens of km per second) persistent hot plasma upflows in active regions (ARs) can also be linked to locations of QSLs. It is likely that these upflows that occur at the
edges of ARs over unipolar magnetic field concentrations are accelerated
by magnetic reconnection along QSLs. We will show multi-temperature
spectral scan observations from Hinode´s EIS combined with magnetic
modeling of QSLs in two ARs observed on 20-21 February 2007 and 11
January 2008. The latter AR is observed and modeled when it is in the
vicinity of the solar central meridian where there are no projection
effects, thereby eliminating ambiguity linking the origin of
multi-temperature observations of AR upflows to QSLs. We use the
Potential Source Surface Model to look for open field lines in the
vicinity of upflows and QSL locations in order to demonstrate whether
these upflows become outflows and can contribute to the solar wind.