Concentration of Citta (psyche) on fire element of the body- A kind of Piṇḍastha Dhyāna (meditation based on the corporeal frame of the body);
in this meditation, the practitioner, concentrating his Citta (psyche) on his navel (-lotus), experiences through mental auto-suggestion that a fire is lit at his navel (-lotus) and all of his defilements are burning away.
nābhikamalasya prajvalanena aśeṣadoṣadāhacintanamāgneyī.
(Mano 4.19)