IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
artículos
Título:
Coronal Transient Events During Two Solar Minima: Their Solar Source Regions and Interplanetary Counterparts
Autor/es:
CREMADES, H.; MANDRINI, C.H.; DASSO, S.
Revista:
SOLAR PHYSICS
Editorial:
SPRINGER
Referencias:
Lugar: Berlín; Año: 2011 vol. 274 p. 233 - 249
ISSN:
0038-0938
Resumen:
In the frame of two coordinated observational and research efforts, two
full solar rotations were investigated in the times of two distinct
solar minima. These two campaigns were dubbed Whole Sun Month (WSM; 10
August - 8 September 1996) and Whole Heliosphere Interval (WHI; 20
March - 16 April 2008). The nearly uninterrupted gathering of
solar coronal data since the beginning of the Solar and Heliospheric
Observatory (SOHO) era offers 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-traveling 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 identified and characterized as well, toward a
global-scale description of their role in determining the
heliospheres conditions. Multi-wavelength images provided by the
space missions SOHO, Yohkoh (only WSM), and Solar-Terrestrial Relations
Observatory (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
differences arise from the analysis of the detailed survey of events:
more (fewer) 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 fields of view are
considered in order to discern instrumentally driven disparities from
inherent differences between solar minima.