idw – Informationsdienst Wissenschaft
Nachrichten, Termine, Experten
Nachrichten, Termine, Experten
Terrestrial Gamma-ray Flashes (TGFs) were discovered in the early 1990s as short and intense pulses of gamma-rays emitted by thunderstorms. TGFs are observed via gamma-rays when the spacecraft is above the source, within the beam. Later some TGF observations were realized to be caused by electrons. Because electrons are charged, they follow the Earth's magnetic field. If the magnetic field line connects the source and the spacecraft, the electrons can be detected even thousands of kilometers away. Recently the Gamma-ray Burst Monitor (GBM) on the Fermi Space Telescope detected strong positron annihilation lines in several "electron" TGFs, showing that these particle beams also contain positrons. Some thunder-storms are powerful particle accelerators, emitting gamma-rays and injecting electron-positron beams into space.
Vortragender: Dr. Michael Briggs, University of Huntsville-Alabama
Information on participating / attending:
Date:
05/23/2011 17:00 - 05/23/2011 19:00
Event venue:
Universität Greifswald
Hörsaal des Instituts für Physik
Felix-Hausdorffr-Str. 6
17489 Greifswald
Mecklenburg-Vorpommern
Germany
Target group:
Scientists and scholars, Students
Relevance:
regional
Subject areas:
Physics / astronomy
Types of events:
Presentation / colloquium / lecture
Entry:
05/03/2011
Sender/author:
Sabine Köditz
Department:
Presse- und Informationsstelle
Event is free:
yes
Language of the text:
English
URL of this event: http://idw-online.de/en/event35229
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