Sun is the ruler of the planets.It doesn't qualify in either benefic or malefic but has class of its own because the placement of Sun wherever makes the the native separate from the aspect of life.
In case of Benefic & is affecting the chart
The Native should wear Ruby Gemstone embedded in Gold ring on Sunday between 16:30 to 18:00 in the 3rd finger
In case of Neutral & is affecting the chart
In case of Malefic & is affecting the chart
The Native should wear 1 Mukhi Rudraksha in Red silk thread in the neck on Sunday.
The native should recite Sun Beej Mantra 7,000 times daily.
The Native should daan Gold/Wheat/Copper on Sunday & do Surya Namaskar daily & recite Surya Mantra 108 times.
The native should kept Sun Yantra in Home as well as Office in copper.
In case of Highly Malefic & is affecting the chart
Do all things mentioned above
The native should daan 21 daan yantras of Sun on Sunday.
One each yantra should be rotated seven times over a head & immense in running water before the noon.Surya Pooja Vidhi / mantar (mantras) are available in SANSKRIT ,HINDI & ENGLISH)