The instrument was designed to collect data for evaluating the risks future Mars-bound astronauts would face from space radiation.

It worked from March 2002 until last month, the agency's Jet Propulsion Laboratory said in a statement.

Efforts to restore the instrument will continue for several weeks or months, the laboratory said.

"Even if the instrument provides no additional data in the future, it has been a great success at characterizing the radiation environment that a crewed mission to Mars would need to anticipate," said Jeffrey Plaut, project scientist for Mars Odyssey.

The October 28 solar storm caused a blackout in Sweden, damaged two Japanese satellites and upset radio and navigation systems for aircraft and ships. Damage was limited because the storm had been forecast and electric utilities and satellite companies took precautions.

Odyssey was launched on April 7, 2001, and reached Mars on October 23, 2001. After a period of tightening its orbit around the Red Planet, Odyssey began its science mission in early 2002.

Other instruments on board look for water and map chemical elements and minerals on the Martian surface.