pyrfu.mms.probe_align_times module#

pyrfu.mms.probe_align_times.probe_align_times(e_xyz, b_xyz, sc_pot, z_phase)[source]#

Returns times when field-aligned electrostatic waves can be characterized using interferometry techniques. The same alignment conditions as Graham et al., JGR, 2015 are used. Optional figure produced showing E_FAC, probe fields, and probe potentials to view time delays between electric fields aligned with B. Currently p5-p6 are not used in this routine; the analysis is the same as the one used for Cluster.

For the figure the panels are :

    1. B in DMPA Coordinates

    1. Magnitude of B in and out of the spin plane

    1. Angles between B and probes 1 and 3 in the spin plane (angle between 0 and 90 degrees)

    1. Spacecraft potential from probes perpendicular to B

    1. E fields from p1-p4 and SC for probes closely aligned with B

    1. E in field-aligned coordinates

    1. E from probes p1-p2 and p3-p4.

Parameters:

  • e_xyz (xarray.DataArray) – Electric field in DSL coordinates, brst mode.

  • b_xyz (xarray.DataArray) – Magnetic field in DMPA coordinates.

  • sc_pot (xarray.DataArray) – L2 Spacecraft potential data. Timing corrections are applied in this

  • z_phase (xarray.DataArray) – Spacecraft phase (z_phase). Obtained from ancillary_defatt.

Returns:

  • start_time1 (to fill) – Start times of intervals which satisfy the probe alignment conditions for probe combinates p1-p2.

  • end_time1 (to fill) – End times of intervals which satisfy the probe alignment conditions for probe combinates p1-p2.

  • start_time3 (to fill) – Start times of intervals which satisfy the probe alignment conditions for probe combinates p3-p4.

  • end_time3 (to fill) – End times of intervals which satisfy the probe alignment conditions for probe combinates p3-p4.