The scales of Yamuna Kalyani are as follows :
Aarohanam (Ascending) : S R2 G3 P M2 P D2 N3 S’
Avarohanam (Descending) : S’ N3 D2 P M2 P G3 M1 R2 S
It is a Janya Raga, derived from Mechakalyani (see below), also called Kalyani, which is the 65th raga on the Melakarta Scale.
Yamuna Kalyani has a peaceful, soothing and romantic mood. It is equivalent to the Hindustani Yaman Kalyan. It is considered an evening raga. Some well known compositions in Yamuna Kalyani are Krishna Nee Begane by Vyasaraaya, Haridasula by Tyagaraja, Jambupathe by Muthuswami Dikshithar and Bhavayami Gopalabalam by Annamacharya.
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.
Music To My Ears 
YAMUNA TEACHER IS MY SANGEETHAM TEACHER
Hello Shaminii, welcome to my blog! She seems to have a musically appropriate name 🙂
Cheers. Suja
I am not too sure how you can play this raaga without nishada! Try playing Krishna Nee Begene and you will realise immediately.
Also, as pointed out, this raaga can be played in Madhyama shruthi i.e. making Ma as Sa and then using Shankarabharana scale swaras. In fact Krishna nee begene baaro sounds better this way.
You are right, my mistake. The original Yamuna Kalyani did not have a Nishada but the Yamuna Kalyani prevalent now definitely does have a Nishadam as well as minor use of Shuddha Madhyama as well. I have corrected my post accordingly.
Thank you!
In piano-keyboard, suppose Middle C is in 2.5 octave. And if C# is in 3 octave, is this equal to C in 4th octave in a 5 octave keyboard?
Sorry, I’m no expert..just a listener!
Cheers. Suja