A2.1 Description of Inputs

The user can control parameters of the plot as listed below:

• Length of plot in hours and minutes. *
• Minimum flux value and number of decades for time series plot. *
• Anisotropy maximum scale value and option for linear or log scaling for mapping to the color bar. *
• Choice of electron, proton, or wart channels (P1-7, E1-4, W1-2) and optional deflect factor for the electrons and foil factor for the ions. Also option to fill in the LEMS120 electrons with LEFS60 values shifted by 180°. *
• Option to read input from ULA or UAV files.
• Option to interpolate (linear smooth) between adjacent channels.
• Option to normalize each panel separately or all together.
• Option to write an HDF file.
• Begin and end time to start and end plotting. This can be typed or read from the file time.dat as in LANSPECT and other analysis programs. The time is used to construct a default file name; it can be accepted, or an alternative can be typed in.

Energy ranges and geometry factors for the requested channel are read from the IDF.DAT file; the version number of the IDF.DAT is printed on the plot.

The input parameters labeled * above can have default values read from a file (lan360.dat); they may be changed from the keyboard at run time if desired.

A2.1.1 Coordinate System

The anisotropies are calculated for three orthogonal planes in the S/C coordinate system. This system is defined by +Z pointing to Earth, the Sun being between +Z and +X, and Y completing a right-hand system. This definition of S/C coordinates may cause confusing effects if an event is being analyzed which occurs during a conjunction of the Earth and the Sun (as viewed from Ulysses). At such a time the definition changes the S/C coordinates relative to the absolute coordinates. Z of course still points to the Earth, X will change from pointing (for example) East to now pointing West, and Y will similarly change to point North instead of South, or vice versa. N. B.: the North/South panel labels are valid only in a configuration with the Sun to the right of the Earth as viewed from the spacecraft, as is true in the vicinity of Jupiter. (Out of the ecliptic plane, the geometry will become even more complicated; near the South polar pass, the Z axis will be pointing roughly North!)

A2.1.2 Layout for Electron and Proton Plots

The top panel of the LAN360 plot depicts the X-Z plane. The idea is to average together the sectors just above and just below the plane of interest. These sectors for the X-Z plane are shown in Figure A2-3. This then gives values of flux in 8 directions (azimuths) around the X-Z plane. After suitable normalization and conversion to a color bar, these values are plotted as a vertical strip at the appropriate time. The "smooth" option invokes linear smoothing between anisotropy values in adjacent directions. No smoothing is done vs. time.

Figure A2-3 Diagram showing the 16 sectors that are used to determine the anisotropies for the spacecraft X-Z plane, the detectors from which the measurements are made, and their final location on the LAN360 plot.