The scales of Chalanatta are as follows :
Aarohanam (Ascending) : S R3 G3 M1 P D3 N3 S’
Avarohanam (Descending) : S’ N3 D3 P M1 G3 R3 S
It is the 36th Raga on the Melakarta scale. It is not a popular raga and is far overshadowed by two of the ragas derived from it, Natta and Gambheeranatta. I seem to have a weakness for vivadi ragas with notes placed close to each other, such as in Chalanatta which sounds quite exquisite to me. It gives me both a sense of pathos and tranquillity.
I have not heard any other composition in this raga, though I understand that there are a few. The Muthuswami Dikshitar school lists songs in Natta under Chalanatta. It is so rarely elaborated that I was very excited to hear Sanjay Subrahmanyan’s RTP in this raga. Hoping that you too will enjoy a more detailed listen to this raga, I have uploaded it for you.
Note : The 12 notes in the octave are named as below. Please note that C is used as Sa for the sake of simplicity as the scale is relative in Carnatic Music. Also note that the scales paint only a superficial picture of the raga as the gamakas(ornamentations) are a very important part of a raga.