LONDON, July 19 Reuters The dollar rose in jittery trading on Friday, as a worldwide cyber outage that hit banks, airlines and broadcasters unsettled investors, although volatility in the currency market remained contained.

Signs of disruption in one of the world39;s busiest financial centres emerged as London trade got underway. LSEG Group, which runs the London Stock Exchange, suffered an outage that affected user access to some of its products.

Risk appetite has recoiled this week, punishing technology stocks in particular, while expectations for a rate cut as early as September from the Federal Reserve have taken a chunk out of the dollar, especially against lowinterest rate currencies such as the yen and the Swiss franc.

The huge gap between U.S. rates and those in Japan and even in Switzerland has created an opportunity for investors to sell those currencies to fund purchases of assets with higher returns such as the dollar, or supercharged tech stocks or cryptocurrencies.

The yen has also gained after suspected official buying last week from Japanese authorities, and wariness of more of the same was in the mix on Friday.

There is a bit of a carry unwind going on and the Swissie has traded notably firmer this week as well, Pepperstone senior analyst Michael Brown said.

The carry unwind is perhaps part of a broader momentum unwind that we39;re seeing the tech sector has taken a bit of a battering in four out of the last five days as well, he said.

The yen ,…