Editing Direct insolation (section)

==Applications==
Since radiation directly from the sun can be focussed with mirrors and lens, it can be applied to concentrated solar thermal (CST) systems.<ref>{{Cite journal|last=Boerema|first=Nicholas|last2=Morrison|first2=Graham|last3=Taylor|first3=Robert|last4=Rosengarten|first4=Gary|date=2013-11-01|title=High temperature solar thermal central-receiver billboard design|journal=Solar Energy|volume=97|pages=356–368|doi=10.1016/j.solener.2013.09.008|bibcode=2013SoEn...97..356B}}</ref><ref>{{Cite journal|last=Boerema|first=Nicholas|last2=Taylor|first2=Robert A.|last3=Morrison|first3=Graham|last4=Rosengarten|first4=Gary|date=2015-09-01|title=Solid–liquid phase change modelling of metallic sodium for application in solar thermal power plants|journal=Solar Energy|volume=119|pages=151–158|doi=10.1016/j.solener.2015.06.024|bibcode=2015SoEn..119..151B}}</ref><ref>{{Cite journal|last=Boerema|first=Nicholas|last2=Morrison|first2=Graham|last3=Taylor|first3=Robert|last4=Rosengarten|first4=Gary|date=2012-09-01|title=Liquid sodium versus Hitec as a heat transfer fluid in solar thermal central receiver systems|journal=Solar Energy|volume=86|issue=9|pages=2293–2305|doi=10.1016/j.solener.2012.05.001|bibcode=2012SoEn...86.2293B}}</ref> Due to clouds and aerosols, the direct insolation can fluctuate throughout the day, so forecasting the available resource is important in these applications <ref>{{Cite journal|last=Law|first=Edward W.|last2=Kay|first2=Merlinde|last3=Taylor|first3=Robert A.|date=2016-02-01|title=Calculating the financial value of a concentrated solar thermal plant operated using direct normal irradiance forecasts|journal=Solar Energy|volume=125|pages=267–281|doi=10.1016/j.solener.2015.12.031|bibcode=2016SoEn..125..267L}}</ref><ref>{{Cite journal|last=Law|first=Edward W.|last2=Prasad|first2=Abhnil A.|last3=Kay|first3=Merlinde|last4=Taylor|first4=Robert A.|date=2014-10-01|title=Direct normal irradiance forecasting and its application to concentrated solar thermal output forecasting – A review|journal=Solar Energy|volume=108|pages=287–307|doi=10.1016/j.solener.2014.07.008|bibcode=2014SoEn..108..287L}}</ref>