Some Helios 2  3D-spectra

Instrument 1A

A new reduction of the 3D raw data. In the following spectra we present some proton  velocity distribution functions  as isocountour plots of  phase space density. These 11 spectra correspond to a small part of the high data mode measurements of the instrument each 40.5 seconds. For each spectrum we plot the 1D counts distribution, the pitch angle mictrostructure (two bottom pictures) and a central cut (top-right), in which the magnetic field is perpendicular to screen plane. Some fluid parameters are also shown. Tha last three cuts are planes in the velocity space from the full 3D spectrum. For more details of these representationn of the velocity distribution functions see: Astudillo, H. F., S. Livi, E. Marsch, and H. Rosenbauer, Evidence for nongyrotropic alpha particles and proton distributions functions: TAUS solar wind meassurements, J. Geophys. Res., 101, 24 423, 1996.

• Record 640 (doy 107 year 1976)
• Record 641 (doy 107 year 1976)
• Record 642 (doy 107 year 1976)
• Record 643 (doy 107 year 1976)
• Record 644 (doy 107 year 1976)
• Record 645 (doy 107 year 1976)
• Record 646 (doy 107 year 1976)
• Record 647 (doy 107 year 1976)
• Record 648 (doy 107 year 1976)
• Record 649 (doy 107 year 1976)
• Record 650 (doy 107 year 1976)