Fig. 4
From: The 17 March 2015 storm: the associated magnetic flux rope structure and the storm development
Images connected to the solar source event of the 17 March 2015 MC. a A difference image of the halo CME at 05:30:05 UT from the SOHO/LASCO C3. The yellow oval depicts the envelope of the CME. b An image from SDO/AIA 304 telescope at 01:38:44 UT. Two ribbons are clearly seen, which is related to the PEA. c A magnetograph from the SDO/HMI at 01:00 UT, white positive, black negative. The yellow arrow indicates the orientation of magnetic field component along the PIL