Sindhubhairavi is a Janya Raaga of Raaga Natakapriya with the following notations.
Aarohanam : S R2 G2 M1 G2 P D1 N2 S
Avarohanam: N2 D1 P M1 G2 R1 S N2 S
Sindhu Bhairavi is said to have it’s origin from Hindustani, and is a morning Raga according to the North Indian Musical tradition . The raaga Sindhubhairavi evokes very happy and pleasant emotions. This raga is one of its kind were all the swaras in the Carnatic system is used except for Kakali Nishadam. It is a colourful raga and soothes the nervous system. It is said that the Raga can cure Headache, back pain and chest pain and can give freshness to the mind. Sindhubhairavi is just like a magnet attracting people. One can experience peace and tranquility while playing or listening to the raga. It blends folk and classical music that could be appreciated even by a common man without much of information on raaga. The Raagam suits folk themes better than other Carnatic Raagas giving a simple non-complicated straight forward expression to folk emotions like pathos and folk life style.There are also very few krities in the parent Naatakapriya. It admits of many semi-classical tunes and is often used towards the end of a Carnatic concert.
Sindhubhairavi is the hot favourite of musicians. Sindhubhairavi is a beautiful ragam that gives a total freedom of expression to the artist. It is as if a canvas, a whole lot of colours and a set of brushes are given to an artist to express himself/herself in a free style presentation. Sindhubhairavi is a modern raga. The beauty and shades of this raga has stolen the minds and hearts of the artists and hence most of the musicians see to it that they render a bhajan or a virutham or sloka or any small composition in this particular ragam towards the end of a concert.
Sindhubhairavi takes almost all the notes in the carnatic music. The notes convey sometimes intense grief or a sudden gush of joy. It is said that Tansen popularised this raga to a great extent. Many facets of this raga is borrowed from the North Indian Music.
The relaxing Sindhubhairavi blends a folk and classical music bhaava that could be appreciated even by a common man without much of information on raaga.It is often used towards the end of a Carnatic concert.
A collection of keerthanams in Raga Sindhubhairavi
ANURADHA MAHESH 
Very good info for novices like me who want to understand and know about classical music ..!!!
Thank you..
Very nice.