Signatures of reconnection in the post-CME rays (CROSBI ID 644272)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Žic, Tomislav ; Vršnak, Bojan ; Vujić, Eugen
engleski
Signatures of reconnection in the post-CME rays
We analyze physical characteristics of the ray-like coronal features formed in the aftermath of coronal mass ejections (CMEs), using the data recorded by the Large Angle and Spectrometric Coronagraph (LASCO). In particular, we focus on measurements of the ray width, density excess, and flow velocities as a function of the radial distance in the LASCO-C2 field of view. The morphology of rays indicates that they occur as a consequence of the Petschek-like reconnection in the large scale current sheet formed in the wake of CME. The hypothesis is supported by the flow pattern, showing inflows into the ray, and outflows along the ray. The inflow velocities are in the order of 10 km/s, consistent with the narrow opening-angle of rays, adding up to a few degrees. The density of rays is by an order of magnitude larger than in the ambient corona. The mass-excess and density-excess measurements are compared with the results of the analytical model in which the Petschek-like reconnection geometry is applied to the vertical current sheet, taking into account that the external coronal density decreases with height. The model-results are consistent with the observations, revealing that the main cause of the density excess in rays is a transport of the dense plasma from lower to larger heights by the reconnection outflow.
Sun: coronal mass ejections (CMEs) ; Sun: corona ; (Sun:) solar wind ; magnetohydrodynamics (MHD)
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
Podaci o prilogu
2009.
objavljeno
Podaci o matičnoj publikaciji
Universal heliophysical processes: proceedings of the 257th Symposium of the International Astronomical Union held in Ioannina, Greece, September 15-19, 2008
Gopalswamy, N. ; Webb, D.
Cambridge : New York: Cambridge University Press
Podaci o skupu
Nepoznat skup
predavanje
29.02.1904-29.02.2096