The late Dr Ralph Lillford wanted half of the proceeds of his art estate to be donated to charity Rural Aid to help drought-stricken farmers and rural communities.

An online auction is already underway and will conclude at 5pm on December 1. Bidding is similar to the eBay system.

The works are being auctioned through Raffan Kelaher and Thomas and have already attracted considerable interest.

"There is only just over 50 lots so it's not a big auction. There has been considerable interest in the auction and it presents people with the opportunity to buy Australian art while at the same time supporting Rural Aid and Buy A Bale," Director Michael Thomas said.

"Ralph Lillford's work is very eclectic and it appeals to a wide range of buyers.

"Ralph was an incredible Australian artist and his work was shown all around the world, and this has created a lot of interest for new and experienced art buyers alike.

"Ralph's unique style is a range of Australian and international influences, which makes it appealing to a broad range of buyers."

Proceeds from the auction will be directed to Rural Aid's disaster relief program which provides farming families across the country with water, hay and financial assistance.

"The reality of Australia's harsh conditions, combined with natural disasters, are devastating for our farmers and rural communities, on many levels," Rural Aid National Business Development Manager Wayne Thomson said.

"We appreciate and thank Dr Lillford for his support of the farmers and rural communities through his generous donation to his adopted country."

Dr Lillford was born in the United Kingdom in 1932 and first came to Australia in 1992. He moved with his family to Coffs Harbour in 1998.

To place a bid in the auction before 5pm on December 1 go to rkta.com.au/auction/ruralaid/