Solar ETF's vs. Russell 2000 (KWT; TAN; RUT)

The solar ETF's (KWT; TAN) are tracking each other (eyeballing, I'd guess a 90% correlation) and over the last ten days have been perking up relative to the Russell 2000 and more importantly, in absolute terms. We had this headline two days after the 8/11 bottom:
"Solar Waking Up: Solar Stocks Comparison Table August 13"

From BigCharts: