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UID:3950-1652360400-1652364000@ecap.nat.fau.de
SUMMARY:ECAP Seminar: Silvia Celli
DESCRIPTION:On the radiation signatures of Galactic PeVatrons: the gamma-ray and neutrino perspective\nVery-high-energy gamma rays and neutrinos are crucial messengers for assessing the PeVatron nature of cosmic sources. In particular\, supernova remnants (SNRs) are since long time believed to be the major contributors to the Galactic cosmic-ray flux observed at Earth. Despite experimental efforts devoted to the identification of PeV activity in SNRs\, such a picture remains yet to be confirmed. Additionally\, the poor knowledge of the magnetic turbulence development and evolution in these sources still prevent us from a full understanding of the process of particle acceleration and propagation at SNR shocks. In this contribution\, I will review the current status of the SNR paradigm for the origin of cosmic rays\, highlighting how (current and future) gamma-ray and neutrino observations can contribute to test this scenario and possibly provide constraints to model parameters. At the same time\, I will also discuss how some features in the cosmic-ray spectrum are possibly related to run-away particles injected by SNRs in the Galaxy\, and what information do they provide about these sources.
URL:https://ecap.nat.fau.de/index.php/event/ecap-seminar-2022-05-12-silvia-celli/
LOCATION:ECAP\, room 307\, Erwin-Rommel-Str 1\, Erlangen\, 91058\, Germany
CATEGORIES:Seminar
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DTSTART;TZID=Europe/Berlin:20220519T140000
DTEND;TZID=Europe/Berlin:20220519T150000
DTSTAMP:20260421T033616
CREATED:20220507T114049Z
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UID:3956-1652968800-1652972400@ecap.nat.fau.de
SUMMARY:ECAP Seminar: Brian Hare
DESCRIPTION:Revealing Lightning with the LOFAR radio telescope\nLightning is an extremely complex phenomena that is still only poorly understood. For example\, we do not know how lightning initiates\, how it propagates\, or why it emits intense bursts of gamma radiation. One fundamental difficulty in studying lightning is that the best state-of-the-art models are only applicable to spatial regions below a meter in size\, while most observations have 10-100 m resolution. This leaves a large gap between what can been modeled and what can be measured. In the last few years\, however\, our group has started using the LOFAR radio telescope to probe lightning at meter and nanosecond scale resolution and have made tremendous progress in closing the gap between modeling and measurement. In this talk I will discuss the current state of lightning science\, how we are using the LOFAR radio telescope to image lightning\, and exciting new insights that LOFAR is giving into the initiation and propagation of lightning.
URL:https://ecap.nat.fau.de/index.php/event/ecap-seminar-2022-05-19-brian-hare/
LOCATION:ECAP\, room 307\, Erwin-Rommel-Str 1\, Erlangen\, 91058\, Germany
CATEGORIES:Seminar
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