I know that heat transfer can be conduction, radiation or convection, but I don't know which one it is.
closed as off-topic by Nathaniel, G. Smith, Thomas Fritsch, Aaron Stevens, JMac Aug 26 at 20:07
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Is the person touching the sun? conduction needs contact of solids.
Convection is when a fluid is moving in bulk brings changes in the ambient temperature, as the wind does. The temperature of the atmosphere depends on convection and indirectly the persons living in this atmosphere.
The sun is a ball of plasma millions of kilometers away and its radiation, traveling through vacuum, enters the atmosphere and part of it reaches the person directly, to warm him/her.
The direct radiation also heats up solid matter , the ground can get very hot, and it is part of the heat of the atmosphere . Radiation heats a person directly, and indirectly both conduction and convection play a role in the heat felt by the person.