What is the purpose of DISHA satellites being developed by ISRO?
Studying the Earth's upper atmosphere and space weather
DISHA (Disturbed and quiet-type Ionosphere System at High Altitude) is a proposed pair of small satellites (DISHA-H and DISHA-L) planned by ISRO for aeronomy research.
The twin satellites are meant to study the Earth's upper atmosphere and ionosphere — airglow, plasma density and how these respond to solar activity — under both quiet and disturbed conditions, i.e., to understand space weather and its effects on communication and navigation signals.
Telecommunication is handled by the GSAT series, ocean observation by Oceansat, and navigation by NavIC (IRNSS); DISHA is a scientific mission, not a service satellite for these purposes.
Hence, the answer is Studying the Earth's upper atmosphere and space weather.
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