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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2205.05115">arXiv:2205.05115</a> <span> [<a href="https://arxiv.org/pdf/2205.05115">pdf</a>, <a href="https://arxiv.org/format/2205.05115">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atmospheric and Oceanic Physics">physics.ao-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1029/2023GL102958">10.1029/2023GL102958 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First High-speed Video Camera Observations of a Lightning Flash Associated with a Downward Terrestrial Gamma-ray Flash </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Abbasi%2C+R+U">R. U. Abbasi</a>, <a href="/search/physics?searchtype=author&query=Saba%2C+M+M+F">M. M. F. Saba</a>, <a href="/search/physics?searchtype=author&query=Belz%2C+J+W">J. W. Belz</a>, <a href="/search/physics?searchtype=author&query=Krehbiel%2C+P+R">P. R. Krehbiel</a>, <a href="/search/physics?searchtype=author&query=Rison%2C+W">W. Rison</a>, <a href="/search/physics?searchtype=author&query=Kieu%2C+N">N. Kieu</a>, <a href="/search/physics?searchtype=author&query=da+Silva%2C+D+R">D. R. da Silva</a>, <a href="/search/physics?searchtype=author&query=Rodeheffer%2C+D">Dan Rodeheffer</a>, <a href="/search/physics?searchtype=author&query=Stanley%2C+M+A">M. A. Stanley</a>, <a href="/search/physics?searchtype=author&query=Remington%2C+J">J. Remington</a>, <a href="/search/physics?searchtype=author&query=Mazich%2C+J">J. Mazich</a>, <a href="/search/physics?searchtype=author&query=LeVon%2C+R">R. LeVon</a>, <a href="/search/physics?searchtype=author&query=Smout%2C+K">K. Smout</a>, <a href="/search/physics?searchtype=author&query=Petrizze%2C+A">A. Petrizze</a>, <a href="/search/physics?searchtype=author&query=Abu-Zayyad%2C+T">T. Abu-Zayyad</a>, <a href="/search/physics?searchtype=author&query=Allen%2C+M">M. Allen</a>, <a href="/search/physics?searchtype=author&query=Arai%2C+Y">Y. Arai</a>, <a href="/search/physics?searchtype=author&query=Arimura%2C+R">R. Arimura</a>, <a href="/search/physics?searchtype=author&query=Barcikowski%2C+E">E. Barcikowski</a>, <a href="/search/physics?searchtype=author&query=Bergman%2C+D+R">D. R. Bergman</a>, <a href="/search/physics?searchtype=author&query=Blake%2C+S+A">S. A. Blake</a>, <a href="/search/physics?searchtype=author&query=Buckland%2C+I">I. Buckland</a>, <a href="/search/physics?searchtype=author&query=Cheon%2C+B+G">B. G. Cheon</a>, <a href="/search/physics?searchtype=author&query=Chikawa%2C+M">M. Chikawa</a>, <a href="/search/physics?searchtype=author&query=Fujii%2C+T">T. Fujii</a> , et al. (127 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2205.05115v2-abstract-short" style="display: inline;"> In this paper, we present the first high-speed video observation of a cloud-to-ground lightning flash and its associated downward-directed Terrestrial Gamma-ray Flash (TGF). The optical emission of the event was observed by a high-speed video camera running at 40,000 frames per second in conjunction with the Telescope Array Surface Detector, Lightning Mapping Array, interferometer, electric-field… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.05115v2-abstract-full').style.display = 'inline'; document.getElementById('2205.05115v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2205.05115v2-abstract-full" style="display: none;"> In this paper, we present the first high-speed video observation of a cloud-to-ground lightning flash and its associated downward-directed Terrestrial Gamma-ray Flash (TGF). The optical emission of the event was observed by a high-speed video camera running at 40,000 frames per second in conjunction with the Telescope Array Surface Detector, Lightning Mapping Array, interferometer, electric-field fast antenna, and the National Lightning Detection Network. The cloud-to-ground flash associated with the observed TGF was formed by a fast downward leader followed by a very intense return stroke peak current of -154 kA. The TGF occurred while the downward leader was below cloud base, and even when it was halfway in its propagation to ground. The suite of gamma-ray and lightning instruments, timing resolution, and source proximity offer us detailed information and therefore a unique look at the TGF phenomena. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.05115v2-abstract-full').style.display = 'none'; document.getElementById('2205.05115v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Geophysical Research Letters, 50, e2023GL102958 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2111.09962">arXiv:2111.09962</a> <span> [<a href="https://arxiv.org/pdf/2111.09962">pdf</a>, <a href="https://arxiv.org/format/2111.09962">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atmospheric and Oceanic Physics">physics.ao-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.105.062002">10.1103/PhysRevD.105.062002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Observation of Variations in Cosmic Ray Single Count Rates During Thunderstorms and Implications for Large-Scale Electric Field Changes </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Abbasi%2C+R+U">R. U. Abbasi</a>, <a href="/search/physics?searchtype=author&query=Abu-Zayyad%2C+T">T. Abu-Zayyad</a>, <a href="/search/physics?searchtype=author&query=Allen%2C+M">M. Allen</a>, <a href="/search/physics?searchtype=author&query=Arai%2C+Y">Y. Arai</a>, <a href="/search/physics?searchtype=author&query=Arimura%2C+R">R. Arimura</a>, <a href="/search/physics?searchtype=author&query=Barcikowski%2C+E">E. Barcikowski</a>, <a href="/search/physics?searchtype=author&query=Belz%2C+J+W">J. W. Belz</a>, <a href="/search/physics?searchtype=author&query=Bergman%2C+D+R">D. R. Bergman</a>, <a href="/search/physics?searchtype=author&query=Blake%2C+S+A">S. A. Blake</a>, <a href="/search/physics?searchtype=author&query=Buckland%2C+I">I. Buckland</a>, <a href="/search/physics?searchtype=author&query=Cady%2C+R">R. Cady</a>, <a href="/search/physics?searchtype=author&query=Cheon%2C+B+G">B. G. Cheon</a>, <a href="/search/physics?searchtype=author&query=Chiba%2C+J">J. Chiba</a>, <a href="/search/physics?searchtype=author&query=Chikawa%2C+M">M. Chikawa</a>, <a href="/search/physics?searchtype=author&query=Fujii%2C+T">T. Fujii</a>, <a href="/search/physics?searchtype=author&query=Fujisue%2C+K">K. Fujisue</a>, <a href="/search/physics?searchtype=author&query=Fujita%2C+K">K. Fujita</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+R">R. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Fukushima%2C+M">M. Fukushima</a>, <a href="/search/physics?searchtype=author&query=Fukushima%2C+R">R. Fukushima</a>, <a href="/search/physics?searchtype=author&query=Furlich%2C+G">G. Furlich</a>, <a href="/search/physics?searchtype=author&query=Globus%2C+N">N. Globus</a>, <a href="/search/physics?searchtype=author&query=Gonzalez%2C+R">R. Gonzalez</a>, <a href="/search/physics?searchtype=author&query=Hanlon%2C+W">W. Hanlon</a>, <a href="/search/physics?searchtype=author&query=Hayashi%2C+M">M. Hayashi</a> , et al. (140 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2111.09962v1-abstract-short" style="display: inline;"> We present the first observation by the Telescope Array Surface Detector (TASD) of the effect of thunderstorms on the development of cosmic ray single count rate intensity over a 700 km$^{2}$ area. Observations of variations in the secondary low-energy cosmic ray counting rate, using the TASD, allow us to study the electric field inside thunderstorms, on a large scale, as it progresses on top of t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.09962v1-abstract-full').style.display = 'inline'; document.getElementById('2111.09962v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2111.09962v1-abstract-full" style="display: none;"> We present the first observation by the Telescope Array Surface Detector (TASD) of the effect of thunderstorms on the development of cosmic ray single count rate intensity over a 700 km$^{2}$ area. Observations of variations in the secondary low-energy cosmic ray counting rate, using the TASD, allow us to study the electric field inside thunderstorms, on a large scale, as it progresses on top of the 700 km$^{2}$ detector, without dealing with the limitation of narrow exposure in time and space using balloons and aircraft detectors. In this work, variations in the cosmic ray intensity (single count rate) using the TASD, were studied and found to be on average at the $\sim(0.5-1)\%$ and up to 2\% level. These observations were found to be both in excess and in deficit. They were also found to be correlated with lightning in addition to thunderstorms. These variations lasted for tens of minutes; their footprint on the ground ranged from 6 to 24 km in diameter and moved in the same direction as the thunderstorm. With the use of simple electric field models inside the cloud and between cloud to ground, the observed variations in the cosmic ray single count rate were recreated using CORSIKA simulations. Depending on the electric field model used and the direction of the electric field in that model, the electric field magnitude that reproduces the observed low-energy cosmic ray single count rate variations was found to be approximately between 0.2-0.4 GV. This in turn allows us to get a reasonable insight on the electric field and its effect on cosmic ray air showers inside thunderstorms. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.09962v1-abstract-full').style.display = 'none'; document.getElementById('2111.09962v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 November, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2021. </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a 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