Surya Gayatri Mantras are the Gayatri mantras to be chanted during the Surya puja or Surya japam. Surya Bhagavan or the Sun God is the Pratyaksha Narayana, the God who appears directly to us. Each God has his own Gayatri mantra.
Here are the Gayatri mantras for Adhi devata and Prati devata along with the main mantra.
Surya Gayatri Mantram
Om kashyapeyaya vidmahe theekshmanshavecha dheemahi thanna Suryah Prachodayath
Adhi Devata Mantram
Om mahadevaya vidmahe vyaghrajinaaya dheemahi thanno rudra prachodayath
Prathyadhi devata mantram