Coronal Mass Ejection Production from the 11121 and 11123 Active Region Cluster

H. CREMADES; C. H. MANDRINI; B. SCHMIEDER; M. CRESCITELLI

Cuzco

Congreso; X COLAGE; 2014

Asociación Latinoamericana de Geofísica Espacial

P { margin-bottom: 0.08in; } The cluster formed by active regions 11121 y 11123 (NOAA numbers), approximately located on the solar central meridian, is of great scientific interest, not only because it gave birth to notable events, but also because during its passage it was site of emergence of new magnetic bipoles. These induced the destabilization of active and quiescent filaments that were ejected as Earth-directed coronal mass ejections (CMEs). From Earth?s perspective, the eruptive events are observed by the AIA instrument aboard the Solar Dynamics Observatory (SDO) and by the LASCO coronagraphs on the Solar and Heliospheric Observatory (SOHO). Fate decided that for this date the twin STEREO spacecraft were approximately 180º apart, being capable of observing the cluster on their respective solar limbs and the CMEs that originated there. When comparing the amount of CME events observed from Earth?s perspective and from the orthogonal, provided by STEREO, large disparities are evident. In this respect, the impact on space weather forecasting is crucial, pointing out serious mistakes by missing alarms when there is a lack of solar observations perpendicular to the Sun-Earth line.