Broadband RF Interferometric Mapping and Polarization (BIMAP) Observations of Lightning Discharges: Revealing New Physics Insights Into Breakdown Processes
Abstract
Abstract Broadband radio frequency (RF) interferometry was first introduced in 1996 for lightning studies. The technique has since been improved significantly and has been increasingly widely used in the lightning community. In addition to the interferometry, we now introduce a broadband polarization capability that simultaneously measures the full polarization state of the corresponding RF sources. Polarization observation provides another level of understanding of the discharge processes. In this paper, we describe the new system and present example observations with such a system. Initial observations of impulsive lightning RF pulses, a K‐event leader, and the initiating process for an intracloud flash are presented. The impulsive pulses were often linearly polarized and are consistent with conventional breakdown processes, whereas some occasional pulses were elliptically polarized and are likely related to relativistic breakdown processes. The K‐event was detected polarized along a section of its channel, and the orientation of the polarization was mostly orthogonal to the channel, apparently due to the preceding charge deposition along the channel. The intracloud flash in this paper was initiated with downward fast positive streamers, and the corresponding signals were linearly polarized, consistent with conventional breakdown processes. The orientations of the polarization were nearly uniformly aligned with themore »
- Authors:
-
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of California, Santa Cruz, CA (United States)
- Florida Institute of Technology, Melbourne, FL (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Laboratory Directed Research and Development (LDRD) Program
- OSTI Identifier:
- 1477665
- Alternate Identifier(s):
- OSTI ID: 1474183
- Report Number(s):
- LA-UR-18-24675
Journal ID: ISSN 2169-897X
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research: Atmospheres
- Additional Journal Information:
- Journal Volume: 123; Journal Issue: 18; Journal ID: ISSN 2169-897X
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; lightning physics; interferometry; polarization; lightning initiation
Citation Formats
Shao, Xuan-Min, Ho, Cheng, Caffrey, Michael Paul, Graham, Paul Stanley, Haynes, Brian, Bowers, Gregory S., Blaine, William G., Dingus, Brenda L., Smith, David, and Rasoul, Hamid. Broadband RF Interferometric Mapping and Polarization (BIMAP) Observations of Lightning Discharges: Revealing New Physics Insights Into Breakdown Processes. United States: N. p., 2018.
Web. doi:10.1029/2018JD029096.
Shao, Xuan-Min, Ho, Cheng, Caffrey, Michael Paul, Graham, Paul Stanley, Haynes, Brian, Bowers, Gregory S., Blaine, William G., Dingus, Brenda L., Smith, David, & Rasoul, Hamid. Broadband RF Interferometric Mapping and Polarization (BIMAP) Observations of Lightning Discharges: Revealing New Physics Insights Into Breakdown Processes. United States. https://doi.org/10.1029/2018JD029096
Shao, Xuan-Min, Ho, Cheng, Caffrey, Michael Paul, Graham, Paul Stanley, Haynes, Brian, Bowers, Gregory S., Blaine, William G., Dingus, Brenda L., Smith, David, and Rasoul, Hamid. Thu .
"Broadband RF Interferometric Mapping and Polarization (BIMAP) Observations of Lightning Discharges: Revealing New Physics Insights Into Breakdown Processes". United States. https://doi.org/10.1029/2018JD029096. https://www.osti.gov/servlets/purl/1477665.
@article{osti_1477665,
title = {Broadband RF Interferometric Mapping and Polarization (BIMAP) Observations of Lightning Discharges: Revealing New Physics Insights Into Breakdown Processes},
author = {Shao, Xuan-Min and Ho, Cheng and Caffrey, Michael Paul and Graham, Paul Stanley and Haynes, Brian and Bowers, Gregory S. and Blaine, William G. and Dingus, Brenda L. and Smith, David and Rasoul, Hamid},
abstractNote = {Abstract Broadband radio frequency (RF) interferometry was first introduced in 1996 for lightning studies. The technique has since been improved significantly and has been increasingly widely used in the lightning community. In addition to the interferometry, we now introduce a broadband polarization capability that simultaneously measures the full polarization state of the corresponding RF sources. Polarization observation provides another level of understanding of the discharge processes. In this paper, we describe the new system and present example observations with such a system. Initial observations of impulsive lightning RF pulses, a K‐event leader, and the initiating process for an intracloud flash are presented. The impulsive pulses were often linearly polarized and are consistent with conventional breakdown processes, whereas some occasional pulses were elliptically polarized and are likely related to relativistic breakdown processes. The K‐event was detected polarized along a section of its channel, and the orientation of the polarization was mostly orthogonal to the channel, apparently due to the preceding charge deposition along the channel. The intracloud flash in this paper was initiated with downward fast positive streamers, and the corresponding signals were linearly polarized, consistent with conventional breakdown processes. The orientations of the polarization were nearly uniformly aligned with the propagation direction of the streamers, indicating a near uniform electric field in the region of the initiating streamers. Finally, an observation of a cosmic‐ray shower is presented.},
doi = {10.1029/2018JD029096},
journal = {Journal of Geophysical Research: Atmospheres},
number = 18,
volume = 123,
place = {United States},
year = {Thu Sep 06 00:00:00 EDT 2018},
month = {Thu Sep 06 00:00:00 EDT 2018}
}
Web of Science
Figures / Tables:
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