FA18 PILOT LANDS ON WRONG PARALLEL RUNWAY AFTER A TACAN APPROACH TO MINIMUMS.

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I LANDED ON RWY XXL AFTER BEING CLRED FOR RWY XXR ON INST APCH IN IMC CONDITIONS. WE WERE A FLT OF 2 F18C ACFT. THE FLT COMMENCED A SECTION APCH FOR VECTORS TO THE FINAL PORTION OF THE TACAN RWY XXR APCH. DURING THE APCH A SNOWSTORM PASSED OVER THE FIELD WITH WX CONDITIONS DEGRADING TO TACAN APCH MINIMUMS. FLT INTENT WAS TO TAKE SEPARATION ON FINAL WITH MY WINGMAN. WINGMAN DETACHING AND LNDG APPROX 1 MI IN TRAIL. AS RPTED VISIBILITY WORSENED; CONDITIONS MADE IT UNREALISTIC FOR BOTH ACFT TO LAND ON THE FIRST APCH; THE NEW INTENT BECAME TO DETACH AND LAND WINGMAN; WHILE FIRST ACFT EXECUTED MISSED APCH PROCS TO TAKE VECTORS FOR A SECOND APCH. AT THE MISSED APCH POINT; AS THE PLT OF FIRST ACFT I HAD THE APCH LIGHTING SYS IN SIGHT AND DETACHED TO EXECUTE A DSCNT FOR LNDG. THE LNDG WAS STEEP BUT UNEVENTFUL AND I DID NOT REALIZE I HAD LANDED ON RWY XXL UNTIL I SAW THE HANGARS AND SVC BUILDINGS DURING LNDG ROLLOUT. THERE WERE NO ACFT ON FINAL FOR RWY XXL; AND I WAS ABLE TO NORMALLY VISUALLY CLR THE RWY OF ANY OTHER ACFT OR OBSTRUCTIONS. I NEVER SAW THE SECOND; CORRECT RWY XXR; DURING ANY PORTION OF THE APCH; AND THEN BECAME VISUALLY FOCUSED ON MAKING A SAFE LNDG ON THE RWY I DID SEE; PROBABLY PREVENTING ME FROM SEEING RWY XXR AS I DSNDED ON VERY SHORT FINAL. THE PRIMARY CAUSE OF THE DEV WAS A LACK OF AWARENESS ON MY PART DURING THE LNDG PORTION OF FLT. I BECAME FIXATED ON THE ONLY APCH AND RWY LIGHTING I COULD SEE AND ASSUMED IT WAS THE CORRECT RWY WITHOUT VERIFYING EITHER WITH TWR; WHO COULD NOT SEE ME; OR WITH THE APCH NUMBERS ON THE RWY. THE SNOW AND ICING CONDITIONS ALSO ADDED SOME SELF-INFLICTED PRESSURE TO LAND IMMEDIATELY. THE WEATHER AND VISIBILITY ALSO CONTRIBUTED TO THE SITUATION. WITH ASOS REPORTING VFR CONDITIONS AT THE FIELD; OUR FLIGHT EXPECTED AN OVERHEAD APPROACH UNTIL BEING TOLD BY APPROACH THAT THE OVERHEAD WAS CLOSED WITH OVC 015 BEING REPORTED. AT THIS TIME; ASOS WAS REPORTING FEW 035 SCT 070. WHILE BEING VECTORED BY APPROACH; INFORMATION WAS PASSED BY TOWER THAT RVR HAD DECREASED TO 6000 FT; RIGHT AT TACAN MINS. ASOS CONTINUED TO REPORT VFR CONDITIONS TWO HOURS LATER WHILE THE FIELD WAS CONTINUING TO EXPERIENCE SNOW AND ICE WITH LOW CEILINGS.