When one of the built-in electron distributions over the pitch-angle is selected from the pull-down menu located on the Pitch-angle distribution tab ,

a set of controls common to all distributions is displayed, as well as a set of specific controls and indicators relevant for the selected distribution.

The s/l slider selects the flux tube longitudinal coordinate, s, normalized to the central field line length, l, for which the functional form of the pitch angle distribution is displayed in the plot area. The origin of the longitudinal s corresponds to the minimum magnetic field strength along the cental field line, as described in the flux tube Geometry section of this document. This slider also controls the point for which the distribution-specific parameters are displayed in the corresponding greyed-out display fields.

The s0/l slider controls the position of the reference cross section for which the distribution-specific input parameters are defined in the corresponding fields. This control duplicates the functionality of the corresponding controls located on the flux tube Geometry  and Nonthermal Electron Distribution tabs.

The Use B/B0 geometry check mark indicates wheter or not the distribution-specific input parameters are kept constant for any longitudibal coordinate s/l, or are computed based on the local B/B0 ratio, where B represents the local magnetic field strengths, and B0 the value coresponding to the reference crosss section s0/l . Based on the selected reference cross section, the longitudinal dependence of this ratio is displayed on the flux tubeGeometry  tab.

In the example depicted above, which coresponds to the ELC distribution, the distribution-specific input parameters dMu(s0) and theta_c(s0) chosen by the user are displayed in the corresponding input fields. Note that, when the Use B/B0 geometry is not checked, the local parameters dMu(s) and theta_c(s) are the same as the input parameters, while their local values, and implicitly the functional form of the distribution, are computed in each cross-ection according to the geometrical dependence of the B/B0 ratio.

 

 

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