Russian Scientist Ivan Zimovets Visited ISSI-BJ and Gave a Talk
On June 10, 2015 Ivan Zimovets, Scientific Associate and Deputy Scientific Director of the Interhelioprobe mission at the Space Research Institute (IKI) of the Russian Academy of Sciences, gave a talk on ‘Spatially resolved observations of coronal type II radio burst with multiple emission lanes’ at the National Space Science Center (NSSC) organized by ISSI-BJ. During his talk he presented his recent results some spatially resolved observations of type II bursts in the lower corona (below 2Rs) with the Nancay Radioheliograph and the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO). He clearly showed that the observations do not contradict the hypotheses that multiple emission lanes of type II bursts are the result of radio emission from ahead and behind of CME-driven shocks propagating through the highly inhomogeneous solar corona.
Type II radio bursts are signature of large scale shock waves in the solar corona and interplanetary medium. They are associated with flares and coronal mass ejections (CMEs). Study of type II bursts can provide useful information about physics of collisionless shock waves and can help to understand the origin of solar cosmic rays. Although, type II bursts have been studied for over half a century, their physics is still under debate. Some type II bursts have two or more emission (frequency) lanes. The origin of this phenomenon is not clear yet. This is largely due to lack of detailed spatially resolved observations of type II radio bursts.
