### Physical Variables written in **Ionospheric** Electrodynamics

The plasma and electrodynamic field variables in the ionosphere model are:
- Electric potential
**PHI**in kV, - Hall Conductance
**SigmaH**in 1/Ohm, - Pedersen Conductance
**SigmaP**in 1/Ohm, - Radial current density
**JR**im micro-A/m^2, - Velocities
**V**with its three components**V_x**in km/s,**V_y**and**V_z**, may be further identified by particle species, e.g. electrons (**V_e,x**), - Electric aurface current density
**J**in micro-A/m with its three components**J_x**,**J_y**and**J_z**,

- Electric field
**E**in milli-V/m with its three components**E_x**,**E_y**and**E_z**, - Electric current parallel to the magnetic field,
**J**, computed from_{par}**JR**and the local dipole field orientation.

**New:**Components of**J**in spherical coordinates:**J_t**and**J_p**(same for drift velocity**V**and electric field**E**, if available). Since the model outputs are derived on constant-radius shells, the "r" component of each of these vectors (e.g.,**J_r**) is always zero and thus is not listed.**Note:**The theta component flips sign around the polar axis of the spherical coordinate system (at X=0 and Y=0).- Joule dissipation rate
**Wdiss**in W/m^{2}(computed as**J**^{2}**SigmaP**/(**SigmaP**^{2}+**SigmaH**^{2})). - Solar Zenith Angle
**SZA**in degrees - Pedersen and Hall conductances due to solar extreme ultraviolet (EUV)
**SigmaP,EUV**and**SigmaH,EUV**.

These are calculated from the solar F10.7 index and the SZA distribution and may include background values such as "starlight" conductances. - Pedersen and Hall conductances in 1/Ohm due to precipitation
**SigmaP,prec**and**SigmaH,prec**(may be calculated by MHD proxies such as field aligned currents).

Data displayed are calculated from the total conductance minus the respective EUV conductance contribution (e.g., SigmaP,prec=sqrt[SigmaP^{2}-SigmaP,EUV^{2}]).

Last update: Feb. 11, 2015 - Lutz Rastätter