In-situ measurements by Helios 1 on 1978 January 1 (left panel) and on 1980 May 28 (right panel). Top panel: particle intensities for electrons (dots, scaled by a factor of 10) for channels E03 (green) and E08 (blue), and protons (curves) from channels P4 (olive) and P13 (orange), measured by E6. Next panels from top to bottom: proton solar wind speed (horizontal dotted line shows the averaged pre-event speed), density and temperature; magnetic field strength and direction (RTN). Red dotted line in the last panel depict the IMF polarity. The vertical dotted line across all panels indicates the event onset.