Body
Since you are so very new on this site, you have to realize that we have discussed at length the entire Electromagnetic Spectrum from DC= zero Hz all the way to infinity. You really need a Spectrum Chart.
DC is a Product of the EM Spectrum's Plasmatic conglomerates. DC is how nature's Bio Electricity Operates.
DC HAS FREQUENCY
Any Flow of Magnetic Current has Frequency. (even in 'out of date' electrons, the theoretical spin rate is a frequency inherent in the flow)
DC from a car battery has the frequency of the battery that made it.
DC from Lead Acid has a different 'flavor' or frequency than that from Nickle Cadmium.
DC from Rectified AC will always have a ripple frequency.
DC used in Field Generation devices sometimes incorporate the DC frequency in its action.
Bio Field DC Generators are more healthy if the DC wires and circuit board is Silver rather than copper.
DC HAS to be Made by matter and the composition of the matter will determine the final Frequency.
And I must question your understanding of Infinity..???
Does the star, Sirius, or the Dog Star,. which is the center of the Universe, Have an effect on us? Yes it does. It effects the sensors in the back of the eyes. So what other effects does it have if its "FIELD" can reach us from so far away.
Which leaves everything inbetween infinity and DC, suspect particularly when the belief is held that DC = zero frequency...
Who dreamed that up DC = zero, Norman?
So what really causes the EM variation of Frequencies from the Sun emitting pure Plasma as immense Lighting Strikes as we know them?
MerLynn