Hydra/DDEIS Spectrogram Description

• C(E,t)
  Spin-averaged electron and ion counts as a function of energy, E, and universal time, t.
  Corrections that have been made to the raw spacecraft counts:
  
  • Glint removal
  • Dead-time correction
  • Background removal (if possible)
  • Intra-box gain correction
  • Inter-box gain correction

• The average energy for both electrons and ions appears as a black line.

• To the right of the spectrogram:
  Orbit plot shows the location of the spacecraft with respect to the earth and it's magnetic field.

• Above the spectrogram:
  • L(R_E), the equatorial distance from the center of the earth to the dipole magnetic field line the spacecraft is traversing.
  • Lat_ML, the latitude of the spacecraft in SM (Solar-Magnetospheric) coordinates.
  • PSI Status Bar, indicates whether or not the PSI experiment is running.
  • Electron Background Status Bar, indicates the value of the background subtracted from the electron counts.

• Below the spectrogram:
  • Ion Background Status Bar, indicates the value of the background subtracted from the ion counts.
  • UT, Universal Time, in hours.
  • ILT, Invariant Latitude, which is defined as the latitude of the foot of the dipole magnetic field line which the spacecraft is traversing.
  • MLT, Magnetic Local Time
  • R, the distance to the spacecraft in units of earth radii.