Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of solar panel specialist Evergreen Solar (Nasdaq: ESLR) tumbled as low as 11% in intraday trading on unusually high volume.

So what: As of yesterday's close, Evergreen Solar had rocketed more than 65% over the past month alone, so today's heavy sell-off shouldn't exactly come as a surprise. Other red-hot October solar stocks LDK Solar (NYSE: LDK), Ascent Solar (Nasdaq: ASTI), Suntech (NYSE: STP), and JA Solar (Nasdaq: JASO) are also down more than 5% today.

Now what: This past Wednesday, I speculated that the solar sector may be in for the proverbial pullback. With oil down only about 150 basis points today, we're seeing just how volatile these solar stocks -- often viewed as leveraged energy bets -- can really be. Of course, with so much bullishness about upcoming solar orders, today's plunge might serve as a nice entry point for long-term investors. Just don't be upset with me if I'm still too scared to jump in.

Interested in more info on Evergreen Solar? Add it to your watchlist by clicking here.

Fool contributor Brian Pacampara doesn't own a position in any of the companies mentioned. Try any of our Foolish newsletter services free for 30 days.

True to its name, The Motley Fool is made up of a motley assortment of writers and analysts, each with a unique perspective; sometimes we agree, sometimes we disagree, but we all believe in the power of learning from each other through our Foolish community. The Fool's disclosure policy always gets a perfect score.