It is called Sowrasena in Muthuswami Dikshitar school of Carnatic music.
The mnemonic phrase is sa ri gu ma pa dha ni.
[1] Its ārohaṇa-avarohaṇa structure (ascending and descending scale) is as follows (see swaras in Carnatic music for details on below notation and terms): This rāgam uses the swaras chathusruthi rishabham, antara gandharam, shuddha madhyamam, shuddha dhaivatham and kakali nishadham.
Sarasangi has a few minor janya rāgams (derived scales) associated with it, of which Kamala manohari and Nalinakanti are popular.
Sarasangi's notes when shifted using Graha bhedam, yields 2 other major Melakarta rāgams, namely, Dharmavati and Chakravakam.