Search Results - "Lyons, Walter A."

Synoptic scale outbreak of self-initiated upward lightning (SIUL) from tall structures during the central U.S. blizzard of 1-2 February 2011 by Warner, Tom A., Lang, Timothy J., Lyons, Walter A.

“…A major central U.S. winter cyclone on 1–2 February 2011 produced a band of high winds, up to 75 cm of snow, and numerous reports of thundersnow from Oklahoma…”
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Megaflashes: Just How Long Can a Lightning Discharge Get? by Lyons, Walter A., Bruning, Eric C., Warner, Tom A., MacGorman, Donald R., Edgington, Samantha, Tillier, Clemens, Mlynarczyk, Janusz

“…The existence of mesoscale lightning discharges on the order of 100 km in length has been known since the radar-based findings of Ligda in the mid-1950s…”
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Sprite produced by consecutive impulse charge transfers following a negative stroke: Observation and simulation by Lu, Gaopeng, Cummer, Steven A., Tian, Ye, Zhang, Hongbo, Lyu, Fanchao, Wang, Tao, Stanley, Mark A., Yang, Jing, Lyons, Walter A.

“…On the morning of 5 June 2013, two cameras of the SpriteCam network concurrently captured a red sprite with diffuse halo over a mesoscale convective system…”
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Implications of lightning charge moment changes for sprite initiation by Cummer, Steven A., Lyons, Walter A.

“…We report impulse lightning charge moment changes (defined as occurring in the first 2 ms after return stroke onset) in all cloud‐to‐ground lightning strokes…”
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Observations of Two Sprite-Producing Storms in Colorado by Lang, Timothy J., Lyons, Walter A., Cummer, Steven A., Fuchs, Brody R., Dolan, Brenda, Rutledge, Steven A., Krehbiel, Paul, Rison, William, Stanley, Mark, Ashcraft, Thomas

“…Two sprite-producing thunderstorms were observed on 8 and 25 June 2012 in northeastern Colorado by a combination of low-light cameras, a lightning mapping…”
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Submillisecond imaging of sprite development and structure by Cummer, Steven A., Jaugey, Nicolas, Li, Jingbo, Lyons, Walter A., Nelson, Thomas E., Gerken, Elizabeth A.

“…We report intensified high speed video observations of two mesospheric transient luminous events acquired at 5000 and 7200 frames per second. Downward…”
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Quantification of the troposphere-to-ionosphere charge transfer in a gigantic jet by Cummer, Steven A, Li, Jingbo, Han, Feng, Lu, Gaopeng, Jaugey, Nicolas, Lyons, Walter A, Nelson, Thomas E

“…Gigantic jets are the clearest manifestation of direct electrical coupling between tropospheric thunderstorms and the ionosphere. They are leaders that emerge…”
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Three years of lightning impulse charge moment change measurements in the United States by Cummer, Steven A., Lyons, Walter A., Stanley, Mark A.

“…We report and analyze 3 years of lightning impulse charge moment change (iCMC) measurements obtained from an automated, real time lightning charge moment…”
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Analysis of the first gigantic jet recorded over continental North America by van der Velde, Oscar A., Lyons, Walter A., Nelson, Thomas E., Cummer, Steven A., Li, Jingbo, Bunnell, James

“…Two low‐light cameras near Marfa, Texas, recorded a gigantic jet over northern Mexico on 13 May 2005 at approximately 0423:50 UTC. Assuming that the farthest…”
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Coordinated observations of sprites and in-cloud lightning flash structure by Lu, Gaopeng, Cummer, Steven A., Li, Jingbo, Zigoneanu, Lucian, Lyons, Walter A., Stanley, Mark A., Rison, William, Krehbiel, Paul R., Edens, Harald E., Thomas, Ronald J., Beasley, William H., Weiss, Stephanie A., Blakeslee, Richard J., Bruning, Eric C., MacGorman, Donald R., Meyer, Tiffany C., Palivec, Kevin, Ashcraft, Thomas, Samaras, Tim

“…The temporal and spatial development of sprite‐producing lightning flashes is examined with coordinated observations over an asymmetric mesoscale convective…”
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Lightning charge moment changes for the initiation of sprites by Hu, Wenyi, Cummer, Steven A., Lyons, Walter A., Nelson, Thomas E.

“…The transient ELF(∼50–5000 Hz) magnetic field radiated by lightning discharges across North America was continuously measured at Duke University during the…”
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Structured elves: Modulation by convectively generated gravity waves by Yue, Jia, Lyons, Walter A.

“…We report on a markedly striated elve (Emissions of Light and Very Low Frequency Perturbations due to Electromagnetic Pulse Source) (a “tiger elve”) observed…”
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New World Meteorological Organization Certified Megaflash Lightning Extremes for Flash Distance (709 km) and Duration (16.73 s) Recorded From Space by Peterson, Michael J., Lang, Timothy J., Bruning, Eric C., Albrecht, Rachel, Blakeslee, Richard J., Lyons, Walter A., Pédeboy, Stéphane, Rison, William, Zhang, Yijun, Brunet, Manola, Cerveny, Randall S.

“…Identification and validation of atmospheric extremes are essential to monitoring climate change, to addressing engineering and safety concerns, and to…”
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Sprites, ELF Transients, and Positive Ground Strokes by BOCCIPPIO, D. J, WILLIAMS, E. R, HECKMAN, S. J, LYONS, W. A, BAKER, I. T, BOLDI, R

“…In two summertime mesoscale convective systems (MCSs), mesospheric optical sprite phenomena were often coincident with both large-amplitude positive…”
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Comparison Between High‐Speed Video Observation of Sprites and Broadband Sferic Measurements by Ren, Huan, Lu, Gaopeng, Cummer, Steven A., Peng, Kang‐Ming, Lyons, Walter A., Liu, Feifan, Li, Xiao, Wang, Yongping, Zhang, Shoubao, Cheng, Zhengwei

“…High‐speed video observations of two sprites with halo features were analyzed with concurrent measurements of broadband magnetic sferics. Both events were…”
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Numerical simulation of an elve modulated by a gravity wave by Marshall, R. A., Yue, Jia, Lyons, Walter A.

“…Recent video observations have shown that elves—the visible manifestation of the lightning electromagnetic pulse (EMP) interacting with the lower…”
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UPWARD ELECTRICAL DISCHARGES FROM THUNDERSTORM TOPS by Lyons, Walter A., Nelson, Thomas E., Armstrong, Russell A., Pasko, Victor P., Stanley, Mark A.

“…A variety of storm top electrical discharges have been observed using several types of low-light imagers, film, and the human eye. Recently, a video recorded…”
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Validation of sprite-inducing cloud-to-ground lightning based on ELF observations at Syowa station in Antarctica by Sato, Mitsuteru, Fukunishi, Hiroshi, Kikuchi, Masayuki, Yamagishi, Hisao, Lyons, Walter A

“…Waveform monitoring of ELF radio signals in the frequency range of 1– 400 Hz have been carried out on a routine basis at Syowa station (69.0°S, 39.6°E in…”
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Transient luminous events above two mesoscale convective systems: Storm structure and evolution by Lang, Timothy J., Lyons, Walter A., Rutledge, Steven A., Meyer, Jonathan D., MacGorman, Donald R., Cummer, Steven A.

“…Two warm‐season mesoscale convective systems (MCSs) were analyzed with respect to their production of transient luminous events (TLEs), mainly sprites. The 20…”
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Large charge moment change lightning on 31 May to 1 June 2013, including the El Reno tornadic storm by Lang, Timothy J., Cummer, Steven A., Petersen, Danyal, Flores-Rivera, Lizxandra, Lyons, Walter A., MacGorman, Donald, Beasley, William

“…On 31 May 2013, a line of severe tornadic thunderstorms (the El Reno event) developed during the local afternoon in central Oklahoma, USA. Within range of the…”
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