noun
there; the spot; the place; the occasion; the situation
Refers to a specific physical location or a particular situation/occasion. Often used with particles like で, に, を.
その場にいた全員が驚いた。
Everyone who was there was surprised.
その場の雰囲気にのまれてしまった。
I got overwhelmed by the atmosphere of the occasion.
noun
then and there; on the spot; immediately; at once; impromptu
Used in the form その場で to mean doing something right at that place and time, without delay or preparation.
彼はその場で契約書にサインした。
He signed the contract then and there.
質問にその場で答えるのは難しかった。
It was difficult to answer the question on the spot.
現場 refers to the actual site or scene of an event, often with a nuance of 'on-site' or 'in the field', while その場 is more general and can refer to any place or occasion.
即座 means 'immediately' and is more formal, often used in written language, whereas その場で is a common spoken expression for doing something on the spot.
Compound of その (that) + 場 (place). The adverbial sense derives from the noun sense used with the particle で.