Archives: Glossary Terms: 691 terms

JPL's Interplanetary Network Directorate, formerly IPN-ISD.

A conjunction of an inferior planet that occurs when the planet is lined up directly between the Earth and the ...

A planet that orbits between the Earth and the Sun. Mercury and Venus are the only two inferior planets in ...

Part of the that we cannot see with our eyes but can feel as heat. It is made of waves ...

In a radio system, a selected processing frequency between RF (Radio Frequency) and the end product (e.g. audio frequency).

An international organization that unites national astronomical societies from around the world and acts as the internationally recognized authority for ...

The magnetic field carried along with the solar wind.

The gas and dust that exists in open space between the stars.

A charged particle consisting of an atom stripped of one or more of its electrons.

A region of charged particles in a planet's upper atmosphere. In Earth's atmosphere, the ionosphere begins at an altitude of ...