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NEW YORK, Jan. 14 (Xinhua) -- The U.S. dollar index rose slightly on Tuesday as risk appetite prompted weakening of euro, Japanese yen, Australian dollar and Canadian dollar.

Though improving trade ties between the United States and China should bode poorly for greenback prospects, foreign exchange flows were rather quiet in anticipation of the phase-one trade deal to be signed to give global markets much-desired good news, according to U.S. foreign exchange and international payment services company Tempus Inc.

Swiss franc appreciated substantially against the U.S. dollar on Tuesday after the United States put Swiss franc on its watch list regarding currency manipulation on Monday.

The Swiss franc is mounting a bit of a comeback after losing ground since the start of the year based on the chance that the Swiss National Bank will have to get rid of negative interest rates, said Tempus Inc in a note.

The dollar index, which measures the greenback against six major peers, picked up 0.02 percent to 97.3690 at 3:00 p.m. (2000 GMT).

In late New York trading, the euro was down to 1.1129 U.S. dollars from 1.1138 dollars in the previous session, and the British pound was up to 1.3028 U.S. dollars from 1.2998 dollars in the previous session. The Australian dollar declined to 0.6904 U.S. dollar from 0.6906 dollar.

The U.S. dollar bought 109.98 Japanese yen, higher than 109.91 Japanese yen of the previous session. The U.S. dollar decreased to 0.9673 Swiss franc from 0.9706 Swiss franc, but it increased to 1.3058 Canadian dollars from 1.3047 Canadian dollars.