Authors: H Cremades C H Mandrini B Schmieder A M Crescitelli
Publish Date: 2015/06/17
Volume: 290, Issue: 6, Pages: 1671-1686
Abstract
The cluster formed by active regions ARs NOAA 11121 and 11123 approximately located on the solar central meridian on 11 November 2010 is of great scientific interest This complex was the site of violent flux emergence and the source of a series of Earthdirected events on the same day The onset of the events was nearly simultaneously observed by the Atmospheric Imaging Assembly AIA telescope onboard the Solar Dynamics Observatory SDO and the ExtremeUltraviolet Imagers EUVI on the SunEarth Connection Coronal and Heliospheric Investigation SECCHI suite of telescopes onboard the SolarTerrestrial Relations Observatory STEREO twin spacecraft The progression of these events in the low corona was tracked by the Large Angle Spectroscopic Coronagraphs LASCO onboard the Solar and Heliospheric Observatory SOHO and the SECCHI/COR coronagraphs on STEREO SDO and SOHO imagers provided data from the Earth’s perspective whilst the STEREO twin instruments procured images from the orthogonal directions This spatial configuration of spacecraft allowed optimum simultaneous observations of the AR cluster and the coronal mass ejections that originated in it Quadrature coronal observations provided by STEREO revealed many more ejective events than were detected from Earth Furthermore joint observations by SDO/AIA and STEREO/SECCHI EUVI of the source region indicate that all events classified by GOES as Xray flares had an ejective coronal counterpart in quadrature observations These results directly affect current space weather forecasting because alarms might be missed when there is a lack of solar observations in a view direction perpendicular to the SunEarth lineH Cremades and CH Mandrini acknowledge financial support from the Argentinean grants PICT 2012973 ANPCyT and PIP 2012100413 CONICET H Cremades and CH Mandrini are members of the Carrera del Investigador Científico CONICET AM Crescitelli acknowledges funding from the Comisión Nacional de Energía Atómica CNEA The authors are thankful to Germán Cristiani for his help with GOES data and to the referee for valuable comments and suggestions The SOHO/LASCO data are produced by an international consortium of the NRL USA MPI für Sonnensystemforschung Germany Laboratoire d’Astronomie France and the University of Birmingham UK SOHO is a project of international cooperation between ESA and NASA The STEREO/SECCHI project is an international consortium of the NRL LMSAL and NASA/GSFC USA RAL and Univ Bham UK MPS Germany CSL Belgium IOTA and IAS France SDO/AIA and SDO/HMI data are courtesy of the NASA/SDO and the AIA and HMI Science Teams This article uses data from the SOHO/LASCO CME catalog generated and maintained at the CDAW Data Center by NASA and the CUA in cooperation with NRL from the CACTus CME catalog generated and maintained by the SIDC at the ROB the SEEDS project supported by the NASA/LWS and AISRP programs and the LASCO ARTEMIS Catalog built by the Laboratoire d’Astrophysique de Marseille
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