Magnetic disturbances

[Mr-Medina]

Description

Summary of changes

• Added "_earth_magnetic_dipole_moment" function in the attitude model returning the time-dependent Earth dipole moment. (based on data from World Data Center for Geomagnetism)
• Implemented resulting torque calculations in the disturbance_calculations file to be considered in the attitude modelling. (Based on magnetic dipole formulas from Tai L. Chow (2006) p. 148 - 149 and SMAD)
• Added a test in "attitude_test"

Resolved Issues

• [ ] fixes #201

How Has This Been Tested?

Place two actors in GEO orbit in the magnetic dipole moment vector plane of the Earth, one magnetic, one non-magnetic. Alligning body pointing vectors (and for the magnetic actor: its magnetic dipole) with the local field vector of the Earth. Run simulation and check if magnetic actor follows field lines, and non-magnetic actor doesn't change attitude.

Related Pull Requests

• 198

  Complements the general attitude model.

[GabrieleMeoni]

@Mr-Medina please notice that your test on the magnetic disturbances is failing me. It passes only if I use at least assert angle < 6. With a rough calculation, at that latitude, you should have a rotation in 4000 s of about 2 degrees.