INVESTIGADORES
MANDRINI Cristina Hemilse
congresos y reuniones científicas
Título:
Active region upflow plasma: its relation to small activity and the solar wind
Autor/es:
MANDRINI, C.H.; CULHANE, J.L.; CRISTIANI, G.D.; VÁSQUEZ, A.M.; VAN DRIEL-GESZTELYI, L.; BAKER, D.; PICK, M.; DÉMOULIN, P.; NUEVO, F.A.
Lugar:
Moscú
Reunión:
Congreso; 40th COSPAR Scientific Assembly; 2014
Institución organizadora:
Committee on Space Research
Resumen:
Recent studies show that active
region (AR) upflowing plasma, observed by the Hinode EUV Imaging Spectrometer
(EIS), can gain access to open field lines and be released into the solar wind
via magnetic interchange reconnection occurring below the source surface at
magnetic null-points in pseudo-streamer configurations. When only one simple
bipolar AR is present on the Sun and it is fully covered by the separatrix of a
streamer, like AR 10978 on December 2007, it seems unlikely that the upflowing
AR plasma could find its way into the slow solar wind. However, signatures of
plasma with AR composition at 1 AU that appears to originate from the West of
AR 10978 were recently found by Culhane and coworkers. We present a detailed
topology analysis of AR 10978 based on a linear force-free magnetic field model
at the AR scale, combined with a global PFSS model. This allows us, on one hand,
to explain the variations observed in the upflows to the West of the AR as the
result of magnetic reconnection at quasi-separatrix layers (QSLs). While at a
global scale, we show that reconnection, occurring in at least two main steps,
first at QSLs and later at a high-altitude coronal null-point, allows the AR
plasma to get around the topological obstacle of the streamer separatrix and be
released into the solar wind.