The International Satellites for Ionospheric Studies (ISIS) 1 and 2 were a pair of scientific satellites launched in 1969 and 1971, respectively, as part of an international effort to study Earth’s ionosphere. Their significance lies in their pioneering role in ionospheric research, contributing valuable data to understand the Earth’s upper atmosphere and its interaction with solar radiation.
Design and Construction
These satellites were equipped with scientific instruments to measure various parameters of the ionosphere, such as electron density, temperature, and composition.
Mission Objectives
The primary mission objective of ISIS 1 and 2 was to study the Earth’s ionosphere and its response to solar activity. These satellites aimed to collect data on electron density distribution, ionospheric plasma irregularities, and magnetic field variations. The secondary objectives included investigating the effects of solar radiation on radio wave propagation and understanding the dynamics of the Earth’s upper atmosphere.
Current Status
ISIS 1 and 2 completed their missions in the early 1970s and are no longer operational. They provided valuable data for ionospheric research during their operational lifetimes. As of 2024, both satellites are likely to have re-entered the Earth’s atmosphere and disintegrated, leaving no active components in orbit.
