Accession Number : ADA130627

Title :   Airborne Lightning Characterization.

Descriptive Note : Final technical rept. Jun 79-Aug 82,

Corporate Author : AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH

Personal Author(s) : Rustan,P L ; Kuhlman,B P ; Serrano,A ; Reazer,J ; Risley,M

PDF Url : ADA130627

Report Date : Jan 1983

Pagination or Media Count : 186

Abstract : A WC-130 aircraft was instrumented with eleven electric and magnetic field sensors at different locations. The aircraft was flown in the vicinity of active thunderstorms at altitudes between 1500 and 16000 feet mean sea level (MSL). To correlate the electric fields produced by the lightning flashes and the respective location of the flashes, a ground station network was employed. The ground network consisted of a central station where the electric field and very high frequency (VHF) radiation were measured and four remote stations arranged in a wye configuration with a 20 kilometer (km) radius for measuring VHF. Fourteen channels of continuous analog data with 2 Mega hertz (MHz) bandwidth and ten channels of digital data of 164 microsecond (micro sec) windows with 20 MHz bandwidth at a maximum rate of two data windows per second were recorded in the aircraft. Analog data for the electric field and VHF radiation with 2 MHz bandwidth were recorded at the central ground site. In addition, VHF radiation with 2 MHz bandwidth were recorded at the central ground site. In addition, VHF radiation with 4 MHz bandwidth was recorded in modified video cassette recorders at all four ground sites. IRIG-B time code received at the ground site was retransmitted to the aircraft and remote stations and used for time synchronization. The aircraft and ground sensors were calibrated to detect lightning flashes between zero and 35 km away.

Descriptors :   *AIRBORNE, *LIGHTNING, *ELECTROMAGNETISM, *DATA ACQUISITION, *AVIATION SAFETY, MAGNETIC DETECTORS, MAGNETIC FIELDS, FAR FIELD, WAVEFORMS, ELECTRIC FIELDS, FLASHES, THUNDERSTORMS, FLORIDA, FLIGHT INSTRUMENTS, AVIATION ACCIDENTS, FIRE HAZARDS, VERY HIGH FREQUENCY, RADIATION, DATA PROCESSING, CALIBRATION, ANALOG SIGNALS, DIGITAL SYSTEMS, REMOTE AREAS, GROUND STATIONS, AIR FORCE RESEARCH

Subject Categories : Atmospheric Physics
      Test Facilities, Equipment and Methods
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE