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 Chinese solar specialist Yingli Green Energy (NYSE: YGE) fell more than 11% on a sharp rise in average volume. Big Money selling may have been part of the problem, but a herky-jerky market obsessed with Europe's debt dilemma could have just as easily caused trouble.

So what: Solar stocks such as Suntech Power (NYSE: STP) and LDK Solar (NYSE: LDK) have a lot to lose if Europe turns tight-fisted in the wake of the Greek crisis. Germany, in particular, is a huge buyer of photovoltaic technology.

Now what: Expect to keep seeing days like this, right up until the fear and loathing that's gripped both European and worldwide markets finally subsides. Do you agree? Would you buy shares of Yingli Green Energy at current prices? Please weigh in using the comments box below.

Interested in more information about Yingli Green Energy? Add it to your watchlist.

Fool contributor Tim Beyers is a member of the Motley Fool Rule Breakers stock-picking team. He didn't own shares in any of the companies mentioned in this article at the time of publication. Check out Tim's portfolio holdings and Foolish writings, or connect with him on Google+ or Twitter, where he goes by @milehighfool. You can also get his insights delivered directly to your RSS reader.

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