I have a few questions which I would like to clarify due to conflicting sources or misunderstanding.
1) As an electromagnetic wave is generated, an electric and magnetic field is created OR there is an existing electric and magnetic field in the air/atmosphere, and the produced wave is only "another" field which overrides the existing continuous fields in free space?
2) When a wave is created, what exactly 'moves' in this wave? Is it the electrons, photons or nothing is displaced (only disturbance due to energy are radiated farther away)?
3) Are the charges in the electromagnetic wave causing the radiation in free space only the positively charged particles? And if that's the case, then what is the impact of negative charges in the air/free space on this wave?