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An Avarohana, Avarohanam or Avarohan in Indian classical music terminology is the descending scale of any raga[1]. Each raga has an avarohana and arohana. The notes descend in pitch from the octave tonic (Shadjam or Sa) down to the lower tonic. The Avarohana encompasses the notes included in descending passages but may also specify ornaments such as meend or gamak, convolutions in the scale (where it may not be a simple descending line) etc. Not every raga follows notes down in a strictly decreasing pitch.
In Malahari, which is janya raga of 15th melakarta Mayamalavagowla, the avarohana is S D1 P M1 G2 R1 S[2]. See swaras in Carnatic music for description of this notation.
In Sahana, a janya raga of 28th melakarta Harikambhoji, the Avarohana is S N2 D2 P M1 G3 M1 R2 G3 R2 S[3]. This raga in its avarohana has the notes jumping from one to another (a bit like Dattu). This changes the whole feel of the raga, making Sahana a beautiful to listen to Raga.