naa a22 4500 510732216 CHVBK 20180411082957.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1134/S1063772913120020 doi (NATIONALLICENCE)springer-10.1134/S1063772913120020 The coalescence of two rotating sunspots during the emergence of an active region [Elektronische Daten] [V. Grigor'ev, L. Ermakova, A. Khlystova] The rare phenomenon of the coalescence of two rotating sunspots of the same magnetic polarity during the emergence of the active region NOAA 11117 is investigated using data from the SDO space observatory. The coalescing spots rotated in opposite directions. The leading spot which formed from this process rotated counterclockwise with an angular velocity of 4°/h. A possible explanation is presented, based on a model of the emerging, twisted magnetic Ω flux tube that interacts with convective flows as it crosses the convective zone. Pleiades Publishing, Ltd., 2013 Grigor'ev V. Institute of Solar-Terrestrial Physics, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia aut Ermakova L. Institute of Solar-Terrestrial Physics, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia aut Khlystova A. Institute of Solar-Terrestrial Physics, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia aut Astronomy Reports Springer US; http://www.springer-ny.com 57/12(2013-12-01), 984-990 1063-7729 57:12<984 2013 57 11444 https://doi.org/10.1134/S1063772913120020 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1063772913120020 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Grigor'ev V. Institute of Solar-Terrestrial Physics, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia aut NATIONALLICENCE 700 1- Ermakova L. Institute of Solar-Terrestrial Physics, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia aut NATIONALLICENCE 700 1- Khlystova A. Institute of Solar-Terrestrial Physics, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia aut NATIONALLICENCE 773 0- Astronomy Reports Springer US; http://www.springer-ny.com 57/12(2013-12-01), 984-990 1063-7729 57:12<984 2013 57 11444 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer