At most places on the Earth's surface, the compass doesn't point exactly toward geographic north.
Space weather is the state of the environment in space near the Earth, including the solar wind
Not directly. High-altitude pilots and astronauts can experience enhanced levels of radiation during magnetic storms, but the hazard is due to the radiation, not the magnetic field itself.
This is a question more about health than geophysics; nonetheless, it is a question we are often asked.  
A magnetic storm is a period of rapid magnetic field variation.
The infrastructure and activities of our modern technologically-based society can be adversely affecte
Models and charts of the magnetic field at the Earth's surface need to be periodically updated because the field is constantly changing in time.