B737 CREW HAD LIGHTNING STRIKE.

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ON DSCNT INTO PSC AT NIGHT; WE NOTICED SOME CLOUD-TO-CLOUD LIGHTNING AT OUR 2 O'CLOCK POS A GREAT DISTANCE OFF. WE DID NOT SEE ANY ELECTRICAL ACTIVITY ALONG OUR COURSE AND THE RADAR SHOWED ONLY LEVEL 1 RETURNS WITH SOME SPOTTY LEVEL 2. AROUND FL270 WE BEGAN TO GET SIGNIFICANT ARCING ON THE WINDSCREEN AND WIPER BLADES. A FEW MINS LATER WE ENTERED AN AREA OF MODERATE TURB AND ICING; FOLLOWED BY A BRIGHT FLASH IN CLOSE PROX TO THE ACFT. THE AUTOPLT DISENGAGED AND THE ACFT PITCHED DOWN SLIGHTLY. THE CAPT TOOK CTL OF THE ACFT AND CONTINUED THE DSCNT. THE TURB AND ICING (MODERATE) LASTED FOR ONLY A FEW MINS AND THERE WAS NO FURTHER ELECTRICAL ACTIVITY. I RPTED THE TURB; ICING AND ELECTRICAL ACTIVITY TO ATC. ATC REPLIED THAT NOTHING SIGNIFICANT WAS ON HIS SCREEN. THE FLT CONTINUED TO PSC WITHOUT FURTHER INCIDENT. DUE TO THE BUILDUP OF ELECTRICITY ON THE ACFT; THE LACK OF ANY OTHER ELECTRICAL ACTIVITY IN OUR AREA AND THE LACK OF A LOUD BANG NORMALLY ASSOCIATED WITH A LIGHTNING STRIKE; WE BELIEVED THIS TO BE A STATIC DISCHARGE.