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Observations from Earth indicate that at the solar surface, the outward magnetic field is the strongest at the polar regions.

Is at the solar surface an apposition which the writer has forgotten to add another comma (,) after that?

Observations from Earth indicate that at the solar surface, the outward magnetic field is the strongest at the polar regions.

Is at the solar surface an apposition which the writer has forgotten to add another comma (,) after that?

Observations from Earth indicate that at the solar surface, the outward magnetic field is a strongest at the polar regions.

Is the outward magnetic field an apposition which is belongs to solar surface? although the writer has forgotten to add another comma (,) after field.

Observations from Earth indicate that at the solar surface, the outward magnetic field is the strongest at the polar regions.

Is at the solar surface an apposition which the writer has forgotten to add another comma (,) after that?