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  • 1
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    VHF radio emissions associated with tornadoes (1975)
    American Geophysical Union
    Details
    Publication Date: 1975-10-20
    Print ISSN: 0148-0227
    Electronic ISSN: 2156-2202
    Topics: Geosciences
    Published by American Geophysical Union
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    PAPER CURRENT
  • 2
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    Eclipse Observations at Arecibo, Puerto Rico, on March 7, 1970 (1970)
    Springer Nature
    Details
    Publication Date: 1970-06-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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    PAPER CURRENT
  • 3
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    Analysis of electromagnetic fields on an F-106B aircraft during lightning strikes (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Information on the exterior electromagnetic environment of an aircraft when it is struck by lightning has been obtained during thunderstorm penetrations with an F-106B aircraft. Electric and magnetic fields were observed, using mainly time-derivative type sensors, with bandwidths to 50 MHz. Lightning pulse lengths ranging from 25 ns to 7 microsec have been recorded. Sufficient high-frequency content was present to excite electromagnetic resonances of the aircraft, and peaks in the frequency spectra of the waveforms in the range 7 to 23 MHz are in agreement with the resonant frequencies determined in laboratory scale-model tests. Both positively and negatively charged strikes were experienced, and most of the data suggest low values of peak current.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Interpretation of a class of in-flight lightning signatures (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Data recorded on the NASA F-106B research aircraft during lightning strikes often reveals electric field waveforms which begin with a series of abrupt changes and end in an exponential variation. A possible interpretation of such events is that an ionized channel is completed to the aircraft during the time of the abrupt changes, and the charge on the aircraft dumps into this channel during the time of the exponential. An analysis of measured waveforms assuming a simple RC-circuit model has been carried out for one event, and the results include I = 1000 A, V = -650 kV, R = 1000 Ohms, and W = 100 J.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Breakdown characteristics of an isolated conducting object in a uniform electric field (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A laboratory experiment was conducted to determine the physical processes involved in the electrical breakdown of a particular spark gap arrangement. The gap consists of an isolated conducting ellipsoid located midway between two large flat electrodes. Gradual increase of the applied electric field, E, in the gap produces corona on the ellipsoid tips followed by flashover in a leader-arc sequence. The leader phase consists of the abrupt formation of ionized channels which partially bridge the gap and then decay prior to the arc. Measurements of dE/dt and of current were made, and photographs were taken with an image converter. Experimental parameters are listed.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-CR-178323 , NAS 1.26:178323
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Interpretation of F-106B in-flight lightning signatures (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Various characteristics of the electromagnetic data obtained on a NASA F-106B aircraft during direct lightning strikes are presented. Time scales of interest range from 10 ns to 400 microsecond. The following topics are discussed: (1) Lightning current, I, measured directly versus I obtained from computer integration of measured I-dot; (2) A method of compensation for the low frequency cutoff of the current transformer used to measure I; (3) Properties of fast pulses observed in the lightning time-derivative waveforms; (4) The characteristic D-dot signature of the F-106B aircraft; (5) An RC-discharge interpretation for some lightning waveforms; (6) A method for inferring the locations of lightning channel attachment points on the aircraft by using B-dot data; (7) Simple, approximate relationships between D-dot and I-dot and between B and I; and (8) Estimates of energy, charge, voltage, and resistance for a particular lightning event.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-176387 , NAS 1.26:176387
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Broadband electromagnetic sensors for aircraft lightning research (1980)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: A set of electromagnetic sensors, or electrically-small antennas, is described. The sensors are designed for installation on an F-106 research aircraft for the measurement of electric and magnetic fields and currents during a lightning strike. The electric and magnetic field sensors mount on the aircraft skin. The current sensor mounts between the nose boom and the fuselage. The sensors are all on the order of 10 cm in size and should produce up to about 100 V for the estimated lightning fields. The basic designs are the same as those developed for nuclear electromagnetic pulse studies. The most important electrical parameters of the sensors are the sensitivity, or equivalent area, and the bandwidth (or rise time). Calibration of sensors with simple geometries is reliably accomplished by a geometric analysis; all the sensors discussed possess geometries for which the sensitivities have been calculated. For the calibration of sensors with more complex geometries and for general testing of all sensors, two transmission lines were constructed to transmit known pulsed fields and currents over the sensors.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Lightning Technol.; p 131-152
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    The hollow cathode discharge applied to laser design (1968)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Possibility of laser action in sputtered metallic vapor of iron and copper hollow cathode gas discharge tubes
    Keywords: MASERS
    Type: NASA-CR-94391 , A-46
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Electromagnetic resonances of cylinders and aircraft model with resistive wires (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The natural frequencies of the electromagnetic resonances of conducting bodies with attached wires were determined. The bodies included twp cylinders and an approximate scale model of the NASA F-106B aircraft. All were three feet in length. Time domain waveforms of B-dot and D-dot were obtained from a sampling oscilloscope, and Prony analysis was used to extract the natural frequencies. The first four natural frequencies of the cylinders (and wires) were determined, and a comparison with calculated results of other investigators shows reasonable agreement. Seven natural frequencies were determined for the F-106B model (with wires), and these were compared with results obtained by NASA in 1982 during direct lightning strikes to the aircraft. The agreement between the corresponding natural frequencies of the model and the aircraft is fairly good and is better than that obtained in the previous work using wires with less resistance. The frequencies lie between 6.5 MHz and 41 MHz, and all of the normalized damping rates are between 0.14 and 0.27.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-CR-174203 , NAS 1.26:174203
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Laboratory modeling and analysis of aircraft-lightning interactions (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Modeling studies of the interaction of a delta wing aircraft with direct lightning strikes were carried out using an approximate scale model of an F-106B. The model, which is three feet in length, is subjected to direct injection of fast current pulses supplied by wires, which simulate the lightning channel and are attached at various locations on the model. Measurements are made of the resulting transient electromagnetic fields using time derivative sensors. The sensor outputs are sampled and digitized by computer. The noise level is reduced by averaging the sensor output from ten input pulses at each sample time. Computer analysis of the measured fields includes Fourier transformation and the computation of transfer functions for the model. Prony analysis is also used to determine the natural frequencies of the model. Comparisons of model natural frequencies extracted by Prony analysis with those for in flight direct strike data usually show lower damping in the in flight case. This is indicative of either a lightning channel with a higher impedance than the wires on the model, only one attachment point, or short streamers instead of a long channel.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Type: NASA-CR-169455 , NAS 1.26:169455
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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