IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Coronal Transients during Two Solar Minima: Their Source Regions and Interplanetary Counterparts
Autor/es:
H. CREMADES; C. H. MANDRINI; S. DASSO
Lugar:
Mendoza
Reunión:
Simposio; IAU Symposium 286 on Comparative Magnetic Minima: Characterizing quiet times in the Sun and stars; 2011
Institución organizadora:
International Astronomical Union
Resumen:
In the frame of two coordinated observational and research eff orts, two full solar rotations were investigated in times of two distinct solar minima. These two campaigns were dubbed Whole Sun Month (WSM; August 10 - September 8, 1996) and Whole Heliosphere Interval (WHI; March 20 - April 16, 2008). The nearly uninterrupted gathering of solar coronal data since the beginning of the Solar and Heliospheric Observatory (SOHO) era o ffers the exceptional possibility of comparing two solar minima for the first time, with regard to the coronal transient aspect. This study characterizes the variety of outward-travelling transients observed in the solar corona during both time intervals, from very narrow jet-like events to coronal mass ejections (CMEs). Their solar source regions and ensuing interplanetary structures were identifi ed and characterized as well, towards a global-scale description of their role in determining the heliosphere´s conditions. Multi-wavelength images provided by the space missions SOHO, Yohkoh (only WSM), and Solar-Terrestrial Relations bservatory (STEREO; only WHI) and ground-based observatories were analyzed for coronal ejecta and their solar sources, while data registered by the Advanced Composition Explorer (ACE) spacecraft were inspected for interplanetary CMEs and magnetic clouds. Notable di fferences arise from the analysis of the detailed survey of events: more (less) ejecta during WHI (WSM), 12% (40%) were produced by active regions during WHI (WSM), and nearly no (high) deflection from the radial direction was observed during WHI (WSM). Instrumental aspects such as dissimilar resolution, cadence, and fi elds of view are considered in order to discern instrumentally-driven disparities from inherent di fferences between solar minima.