OBS: Mer detaljer følger, endringer kan forekomme
Observasjonskvelder arrangeres på kort varsel når været er bra. Informasjon sendes ut på epost og på vår facebook-gruppe.
Info om tid og sted kommer!
Dette er væravhengig, så tidspunkt blir bestemt relativt kort tid i forveien.
Professor Martino Marisaldi presenterer rykende ferske forskningsresultater fra Birkeland Centre for Space Science.
Foredraget blir på engelsk:
On April 15 2020 a very short burst of gamma-rays was detected by several spacecrafts in orbit. The burst was initially classified as a short Gamma-Ray Burst, but it was soon realized that the most likely source was the giant flare of a magnetar in a nearby galaxy.
A magnetar is a highly magnetized neutron star, with a magnetic field trillions of times that of the earth. Sporadically, magnetars emit so-called giant flares, blasting huge amounts of energy into space. The burst was so intense that most instruments that observed it were not able to detect all photons coming from the source, because of saturation affects, resulting in a somehow distorted and incomplete view of the event.
The only instrument that did not suffer from any saturation effect was the MXGS instrument of the Atmosphere Space Interactions Monitor (ASIM) mission onboard the International Space station. Remarkably, ASIM was not designed to detect cosmic sources, but rather to observe very short bursts of gamma-rays coming from the Earth atmosphere: the so-called Terrestrial Gamma-ray Flashes (TGF). However, the quality of the measurements allowed our team to discover high-frequency quasi-periodic oscillations in the brightest phase of the flare, which has important implications for understanding these extreme and puzzling sources.
In my presentation I will set the stage on magnetars and their giant flares, and show how a mission designed for earth observation was able to make a breakthrough discovery also in high-energy astrophysics.
Vi omgir oss med lys hvor enn vi ferdes, men trenger vi mørket?
Hvordan påvirker lys døgnet oss mennesker, planter og dyr?
For oss som liker stjernehimmelen er mørket vår venn.
Sted: Fana Kulturhus, møterom Fanafjellet
Hva trenger man av kunnskaper, utstyr og programvare.
Sted: Fana Kulturhus, møterom Fanafjellet
Mer detaljer kommer!