Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994rmxaa..28...17b&link_type=abstract
Revista Mexicana de Astronomia y Astrofisica, 28, 17
Astronomy and Astrophysics
Astronomy
8
Scientific paper
RESUMEN A partir de varios aflos de observaciones combinadas de la corona solar y de frentes de choque que viajan en el medio interplanetario, se obtuvo un grupo de 49 eyecciones de masa coronal (EMC) que estuvieron relacionadas con los choques. En este trabajo se estudi6 Ia posible relaci6n espacial de estas EMC con hoyos coronales y/o regiones activas en el Sol asi como con eventos explosivos superficiales como rafagas y filamentos que desaparecieron. Encontramos que en la mayorfa de los casos un hoyo coronal se encontraba entre + 300 de longitud del limbo sobre el que se observ6 la EMC. Presentamos un posible escenario en el Sol donde todos los eventos relacionados podrian ocurrir como resultado de una desestabilizaci6n MHD de una gran regi6n de la atm6sfera solar que contenga diferentes tipos de estructuras magneticas. En particular, proponemos que las EMC provienen de regiones magneticamente cerradas, mientras que los choques se forman a partir de los hoyos coronales. Se describe el porque' de la ocurrencia conjunta de ambos efectos, pero se muestra que no estan relacionados causalmente. Se presenta tambien evidencia observacional de la asociaci6n entre choques interplanetarios y hoyos coronales. ABSTRACT From an extensive study of coronal mass ejections (CM Es) observed by the Solwind coronagraph on board of P78-1 satellite from 1979 to 1982, combined with the interplanetary observations of Helios 1 spacecraft, a set of 49 CMEs was confidently associated with interplanetary shocks. Here we look for some possible spatial association of these CMEs with coronal holes and/or active regions at the Sun, and consider also their spatial association with the surface explosive events (flares or disappearing filaments) related to them. We found that in most of the cases when a CME was associated with an interplanetary shock, a coronal hole is found between + 300 of longitude from the corresponding limb. We outiine a possible scenario where all the related events could take place as a result of an MHD destabilization of a large region containing different kinds of magnetic structures and discuss the results reanalyzing the association between CMEs and interplanetary shocks. In particular we find that the observations are consistent with the idea that mass ejections come from closed regions, most probably helmet streamers. But we think that they do not necessarily drive the observed interplanetary shocks. We propose that shocks are instead produced by the sudden increase in the flow velocity of the solar wind from the adjacent coronal hole also affected by the global change in the coronal magnetic structure. Observational evidence supporting the association of interplanetary shocks with sudden changes in coronal holes is presented as well. K words: SUN - ACTIVITY - SUN - CORONA - SOLAR WIND
Bravo Silvia
Perez-Enriquez Roman
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