Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...122.118j&link_type=abstract
"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,
Physics
Scientific paper
A recent, detailed study of the well known "solar wind disappearance event" of 11 May 1999 traced its origin to a coronal hole lying adjacent to a large active region, AR8525
in Carrington rotation 1949. The active region was located at central meridian on 05 May 1999 when the flows responsible for this event began. In this paper we examine the evolution of the active region-coronal hole complex during 5-6 May 1999 to study the changes that apparently played a key role in causing this disappearance event. To study the evolution of the solar source region of the disappearance event of 11 May 1999 we have used images from the Soft X-ray Telescope (SXT), the Extreme-ultraviolet Imaging Telescope (EIT) and the Michelson Doppler Imager (MDI) to examine the evolution of the coronal hole and active region complex at the source region of the disappearance event. We find a dynamic evolution taking place in the coronal hole-active region boundary at the source region of the disappearance event of 11 May 1999. Based on the combined observations it appears that the rapid evolution seen in the coronal hole is due to reconnection's taking place between the newly emerging flux and the open field regions from the coronal hole and the active region-coronal hole boundary regions. This evolution, which is found to reduce the area of the coronal hole, is accompanied by the formation of new loops in EUV images which are spatially and temporally correlated with emerging flux regions as seen in MDI data.
As opposed to the well known drivers of space weather phenomena like CME's or large flares, disappearance events are not associated with explosive solar phenomena. However, they do produce other observable effects that are not fully understood. In the period leading up to the disappearance event of 11 May 1999, our observations, during quiet solar conditions and in the absence of CMEs, provide the first clear evidence for Sun-Earth connection originating from an evolving active region-coronal hole region located at central meridian. With the exception of corotating interacting regions, these observations provide the first link between the Sun and space weather effects at 1 AU, arising from non-explosive solar events.
Janardhan Padmanabhan
Mason Harris E.
Tripathi Durga Dutt
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