est imation ▁of ▁the ▁number ▁of ▁possibly ▁cat ast roph ic ▁events . ▁High - resol ution ▁measurements ▁are ▁needed ▁for ▁, ▁ ▁and ▁. ▁ ▁See ▁also ▁ ▁List ▁of ▁solar ▁storm s ▁ ▁References ▁ ▁External ▁links ▁ ▁YouTube ▁Sci Show ▁Space ▁E pisode ▁describing ▁this ▁event ▁ ▁Category : 7 7 4 ▁Category : 7 7 5 ▁Category : Ge om agnet ic ▁storm s ▁Category : Str at ig raph y ▁Category : D end ro log y <0x0A> </s> ▁Sal is bury ▁Plant ation ▁is ▁a ▁ ▁historic ▁house ▁located ▁at ▁West over , ▁Som erset ▁County , ▁Maryland . ▁It ▁has ▁two ▁principal ▁sections : ▁a ▁ 1 9 th - century , ▁two - story ▁plus ▁att ic ▁cla p board ▁section ▁whose ▁roof ▁r idge ▁runs ▁east ▁to ▁west , ▁and ▁a ▁first - qu arter - 1 8 th - century ▁- story ▁brick ▁section ▁with ▁its ▁r idge ▁running ▁north ▁to ▁south . ▁ ▁It ▁was ▁listed ▁on ▁the ▁National ▁Register ▁of ▁Historic ▁Places ▁in ▁ 1 9 7 5 . ▁ ▁References ▁ ▁External ▁links ▁, ▁including ▁und ated ▁photo , ▁at ▁Maryland ▁Historical ▁Trust ▁ ▁Category : H ouses ▁in ▁Som erset ▁County , ▁Maryland ▁Category : H ouses ▁on ▁the ▁National ▁Register ▁of ▁Historic ▁Places ▁in ▁Maryland ▁Category : H ouses ▁completed ▁in ▁ 1 7 2 5 ▁Category : Pl ant ation ▁houses ▁in ▁Maryland ▁Category : History ▁of ▁Maryland ▁Category : 1 7 2 5 ▁establish ments ▁in