Search Results - "Saba, M. M. F."

Upward lightning flashes characteristics from high‐speed videos by Saba, Marcelo M. F., Schumann, Carina, Warner, Tom A., Ferro, Marco Antonio S., Paiva, Amanda Romão, Helsdon, John, Orville, Richard E.

“…One hundred high‐speed video recordings (72 cases in Brazil and 28 cases in USA) of negative upward lightning flashes were analyzed. All upward flashes were…”
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Frequency distributions of some parameters of negative downward lightning flashes based on accurate-stroke-count studies by Ballarotti, Maurício G., Medeiros, Claudia, Saba, Marcelo M. F., Schulz, Wolfgang, Pinto Jr, Osmar

“…This paper presents some parameters of negative cloud‐to‐ground lightning flashes in terms of frequency distribution. All data are based on so‐called…”
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High-speed video observations of positive lightning flashes to ground by Saba, Marcelo M. F., Schulz, Wolfgang, Warner, Tom A., Campos, Leandro Z. S., Schumann, Carina, Krider, E. Philip, Cummins, Kenneth L., Orville, Richard E.

“…Although positive lightning flashes to ground are not as frequent as negative flashes, their large amplitudes and destructive characteristics make…”
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Observations of bidirectional lightning leader initiation and development near positive leader channels by Warner, Tom A., Saba, Marcelo M. F., Schumann, Carina, Helsdon, John H., Orville, Richard E.

“…Based on the analysis of high‐speed optical and electric field change data, we present three observed cases in which a naturally occurring bidirectional…”
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Negative cloud-to-ground lightning properties from high-speed video observations by Saba, M. M. F., Ballarotti, M. G., Pinto Jr, O.

“…From analysis of digital high‐speed video records of 233 negative cloud‐to‐ground (CG) lightning flashes associated with 27 thunderstorms in southeastern…”
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A comparative study of negative cloud-to-ground lightning characteristics in São Paulo (Brazil) and Arizona (United States) based on high-speed video observations by Saraiva, A. C. V., Saba, M. M. F., Pinto Jr, O., Cummins, K. L., Krider, E. P., Campos, L. Z. S.

“…There are only a few prior reports that detail accurate measurements of the number of strokes in natural negative cloud‐to‐ground (CG) lightning flashes. These…”
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Visible channel development during the initial breakdown of a natural negative cloud-to-ground flash by Campos, Leandro Z. S., Saba, Marcelo M. F.

“…GPS time synchronized high‐speed video records (at 4000 frames per second) and electric field waveforms are discussed for one stepped leader of a negative…”
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Resolution of the sprite polarity paradox: The role of halos by Williams, E., Kuo, C.-L., Bór, J., Sátori, G., Newsome, R., Adachi, T., Boldi, R., Chen, A., Downes, E., Hsu, R. R., Lyons, W., Saba, M. M. F., Taylor, M., Su, H. T.

“…This study revisits the sprite polarity paradox, first manifest by observations that exceptional cloud‐to‐ground flashes with negative polarity generally did…”
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Relation between lightning return stroke peak current and following continuing current by Saba, M. M. F., Pinto Jr, O., Ballarotti, M. G.

“…The magnitude of the return stroke peak current preceding continuing current (CC) in ground flashes was investigated. This study was performed using a…”
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High-speed camera observations of negative ground flashes on a millisecond-scale by Ballarotti, M. G., Saba, M. M. F., Pinto Jr, O.

“…A study of cloud‐to‐ground lightning characteristics based on high‐speed camera observations of 455 flashes related to 40 thunderstorms is presented. The…”
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Positive leader characteristics from high-speed video observations by Saba, Marcelo M. F., Cummins, Kenneth L., Warner, Tom A., Krider, E. Philip, Campos, Leandro Z. S., Ballarotti, Mauricio G., Pinto Jr, Osmar, Fleenor, Stacy A.

“…Based on analyses of high‐speed video recordings of cloud‐to‐ground lightning in Brazil and the USA, the characteristics of positive cloud‐to‐ground (+CG)…”
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High-speed video observations of positive ground flashes produced by intracloud lightning by Saba, Marcelo M. F., Campos, Leandro Z. S., Krider, E. Philip, Pinto Jr, Osmar

“…High‐speed video recordings of two lightning flashes confirm that positive cloud‐to‐ground (CG) strokes can be produced by extensive horizontal intracloud (IC)…”
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Continuing Current Seen Above and Below the Cloud: Comparing Observations From GLM and High‐Speed Video Cameras by Ding, Ziqin, Zhu, Yanan, Lapierre, Jeff, DiGangi, Elizabeth, Ringhausen, Jacquelyn, Lauria, Paola B., Saba, Marcelo M. F., Rakov, Vladimir A., Abbasi, Rasha U., Silva, Diego R. R., Silva, Tagianne P.

“…This study assesses the reliability and limitations of the Geostationary Lightning Mapper (GLM) in detecting continuing currents by comparing observations from…”
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Optical observation of needles in upward lightning flashes by Saba, Marcelo M. F., de Paiva, Amanda R., Concollato, Luke C., Warner, Tom A., Schumann, Carina

“…Why lightning sometimes has multiple discharges to ground is an unanswered question. Recently, the observation of small plasma structures on positive leaders…”
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On the Triggering Mechanisms of Upward Lightning by Schumann, Carina, Saba, Marcelo M. F., Warner, Tom A., Ferro, Marco A. S., Helsdon, John H., Thomas, Ron, Orville, Richard E.

“…Upward lightning studies took place in Rapid City, South Dakota, USA and S. Paulo, Brazil during the summer thunderstorm seasons from 2011 to 2016. One of the…”
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The Influence of Diethylaniline and Toluene on the Streamer Propagation in Cyclohexane between a Point-Plane Gap under Positive Impulse Voltage Stress by Wolmarans, Carl P., Nyamupangedengu, Cuthbert, Schumann, Carina, Coville, Neil J., Saba, Marcelo M. F.

“…Liquid insulation is used in high voltage equipment such as power transformers as both dielectric medium and coolant. Breakdown in liquid insulation tends to…”
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First versus subsequent return-stroke current and field peaks in negative cloud-to-ground lightning discharges by Nag, Amitabh, Rakov, Vladimir A., Schulz, Wolfgang, Saba, Marcelo M. F., Thottappillil, Rajeev, Biagi, Christopher J., Oliveira Filho, Alcides, Kafri, Ahmad, Theethayi, Nelson, Gotschl, Thomas

“…We examine relative magnitudes of electric field peaks of first and subsequent return strokes in negative cloud‐to‐ground lightning flashes recorded in…”
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Bipolar cloud-to-ground lightning flash observations by Saba, Marcelo M. F., Schumann, Carina, Warner, Tom A., Helsdon Jr, John H., Schulz, Wolfgang, Orville, Richard E.

“…Bipolar lightning is usually defined as a lightning flash where the current waveform exhibits a polarity reversal. There are very few reported cases of…”
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Relationship between ionospheric plasma bubble occurrence and lightning strikes over the Amazon region by Sousasantos, Jonas, Sobral, José Humberto Andrade, Kherani, Esfhan Alam, Saba, Marcelo Magalhães Fares, de Campos, Diovane Rodolfo

“…The vertical coupling between the troposphere and the ionosphere presents some remarkable features. Under intense tropospheric convection, gravity waves may be…”
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Thunderstorm and lightning characteristics associated with sprites in Brazil by Pinto Jr, O., Saba, M. M. F., Pinto, I. R. C. A., Tavares, F. S. S., Naccarato, K. P., Solorzano, N. N., Taylor, M. J., Pautet, P. D., Holzworth, R. H.

“…A study of the thunderstorm and cloud‐ground lightning characteristics associated with sprite events observed in Brazil is presented. The study is based on…”
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