caa a22 4500 445347414 CHVBK 20180317142833.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s11207-011-9805-7 doi (NATIONALLICENCE)springer-10.1007/s11207-011-9805-7 Multiwavelength Study on Solar and Interplanetary Origins of the Strongest Geomagnetic Storm of Solar Cycle 23 [Elektronische Daten] [Pankaj Kumar, P. Manoharan, Wahab Uddin] We study the solar sources of an intense geomagnetic storm of solar cycle 23 that occurred on 20 November 2003, based on ground- and space-based multiwavelength observations. The coronal mass ejections (CMEs) responsible for the above geomagnetic storm originated from the super-active region NOAA 10501. We investigate the Hα observations of the flare events made with a 15 cm solar tower telescope at ARIES, Nainital, India. The propagation characteristics of the CMEs have been derived from the three-dimensional images of the solar wind (i.e., density and speed) obtained from the interplanetary scintillation data, supplemented with other ground- and space-based measurements. The TRACE, SXI and Hα observations revealed two successive ejections (of speeds ≈ 350 and ≈ 100km s−1), originating from the same filament channel, which were associated with two high speed CMEs (≈ 1223 and ≈ 1660km s−1, respectively). These two ejections generated propagating fast shock waves (i.e., fast-drifting typeII radio bursts) in the corona. The interaction of these CMEs along the Sun-Earth line has led to the severity of the storm. According to our investigation, the interplanetary medium consisted of two merging magnetic clouds (MCs) that preserved their identity during their propagation. These magnetic clouds made the interplanetary magnetic field (IMF) southward for a long time, which reconnected with the geomagnetic field, resulting the super-storm (Dst peak=−472nT) on the Earth. Springer Science+Business Media B.V., 2011 Sun: chromosphere nationallicence Sun: corona nationallicence Sun: coronal mass ejections (CMEs) nationallicence Sun: filaments, prominences nationallicence Sun: flares-sunspots nationallicence Kumar Pankaj Korea Astronomy and Space Science Institute (KASI), Hwaamdong, Yuseong-Gu, 305-348, Daejeon, Republic of Korea aut Manoharan P. Radio Astronomy Centre, National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, 643 001, Udhagamandalam (Ooty), India aut Uddin Wahab Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, 263129, Nainital, India aut Solar Physics Springer Netherlands 271/1-2(2011-07-01), 149-167 0038-0938 271:1-2<149 2011 271 11207 https://doi.org/10.1007/s11207-011-9805-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-011-9805-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kumar Pankaj Korea Astronomy and Space Science Institute (KASI), Hwaamdong, Yuseong-Gu, 305-348, Daejeon, Republic of Korea aut NATIONALLICENCE 700 1- Manoharan P. Radio Astronomy Centre, National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, 643 001, Udhagamandalam (Ooty), India aut NATIONALLICENCE 700 1- Uddin Wahab Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, 263129, Nainital, India aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 271/1-2(2011-07-01), 149-167 0038-0938 271:1-2<149 2011 271 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer