VIX volatility index is up 30% just today

The VIX is the CBOE Volatility Index, a trademarked ticker calculated by the Chicago Board Options Exchange that measures the implied volatility of S&P 500 index options. It is often called the fear index or fear gauge and represents the market's expectation of stock market volatility over the next 30 days. The page lists the Volatility S&P 500 Index as down 8.11% over the past week, 5.18% since last month, and 9.01% over the year, and it does not report a 30% rise today.