Namaste. The mantra says "Klesha hastaaya". Why would Surya bhagavan have kleshas or afflictions in his hand ? I dont say that this makes this unauthentic, but it means there could be some problem with it.It is good that you are trying to understand the meaning, but the task may be more than a bit beyond you( and me as well:-)). Chakra( I guess pronounced as Sha-kra) would be Indra.Chakra ( Ch as in Chain and not as in Chateau) would be a wheel- could refer to Sudarshana. Each mantra is used for a particular purpose.Not all mantras are used generically to get close to the Devatha. Some of them are for a prayoga. I suggest you do not take this up without more information on what this is for. Websites may not be the best place to get that information.