Waking just before sunrise taking bath and then sitting or standing facing the rising sun is a habit promoted by Hinduism from time immemorial. The most popular mantra that is chanted during sunrise by Hindus is the Gayatri Mantra. There is another mantra also that is chanted for good health, peace and prosperity.
Sun (Surya) is the visible God in Hinduism – Pratyaksha Brahman.
Sunrise Mantra In Hinduism
कनकवर्णमहातेजं रत्नमालाविभूषितम्।
प्रातः काले रवि दर्शनं सर्व पाप विमोचनम्।।
Kanakvarnmahatejam ratnamalavibhushitam
Prata kale ravi darshanam sarva papa vimochanam
The mantra is to be chanted 108 times. It is not chanted along with Gayatri Mantra. You should chant this mantra or the Gayatri Mantra.
Benefits of chanting the mantra include good health, early cure to various diseases, peace, prosperity and wealth.