It is the 5th ragam in the 1st chakra Indu. The mnemonic name is Indu-Ma. The mnemonic phrase is sa ra ga ma pa dhi nu. Its arohana-avarohana structure is as follows:
Arohana: S R1 G1 M1 P D2 N3 S'
Avarohana: S' N3 D2 P M1 G1 R1 S
(this scale uses the notes shuddha rishabham, shuddha gandharam, shuddha madhyamam, chathusruthi dhaivatham, kakali nishadham)
As it is a melakarta ragam, by definition it is a sampoorna ragam (has all seven notes in ascending and descending scale). It is the shuddha madhyamam equivalent of Pavani, which is the 41st melakarta.
Manoranjani is the 5th Melakarta in the original list compiled by Venkatamakhin. The notes used in the scale are the same, but the ascending scale is different. It is a shadava-sampurna raga (6 notes in ascending scale, while full 7 are used in descending scale).
Arohana: S R1 M1 P D2 N3 S'
Avarohana: S' N3 D2 P M1 G1 R1 S
Manavati has a few minor janya ragams (derived scales) associated with it.