2. Model Requirements

To satisfy to the projects purposes and to the users requirements the candidate model must include the following features:

1. day-side/night-side asymmetry (i.e., compression of the magnetosphere on the day-side and extension on the night-side due to the interaction of the Solar Wind)
2. daily and season variations
3. accounts for the geomagnetic dipole inclination (tilt angle) relative to the plane orthogonal to the Earth-Sun line within a range of -35^° to +35^°
4. the close relation with the International Geomagnetic Reference Field (IGRF)
5. computation of the magnetospheric induction field includes:

   1. the magnetic field due to the Chapman-Ferraro currents on the magnetopause screening the dipole field
   2. the magnetic field due to the geotail current system magnetic field
   3. the magnetic field due to the ring current
   4. the magnetic field due to Region 1 field-aligned currents and closure ionospheric currents
   5. the magnetic field due to the magnetopause currents screening the ring current
6. model depends on a small set of physical input parameters (model parametrization), such as:

   1. y - geomagnetic dipole tilt angle
   2. R₁ - distance to the subsolar point of the magnetosphere
   3. R₂ - distance to the inner edge of the geotail current sheet
   4. F_¥ - the tail lobe magnetic flux
   5. I_|| - the total strength of Region 1 field-aligned currents
   6. b_r - the ring current magnetic field at the Earth's center
7. the input parameters depend on real-time, or near-real-time Empirical Data:

   1. Solar Wind data
   2. Auroral Oval size and location
   3. AL and Dst magnetic indices
8. the model characterizes the magnetospheric magnetic field under both Solar Quiet and Disturbed conditions, without restrictions/limits imposed on the values of interplanetary medium parameters
9. although in the framework of the proposed standard, the model is intended to be used inside the geostationary orbit it must be selfconsistently enable to provide calculations in the whole magnetosphere