D.Fargion, P.Oliva, Rome University 1,3,Italy Solar Flare: a - PowerPoint PPT Presentation

D.Fargion, P.Oliva, Rome University 1,3,Italy

Solar Flare: a million Hiroshima bomb up to hundred thousands of million Hiroshima energy

Not only solar steady thermonuclear neutrinos, but also sudden flare pion ones • When proton proton scatter in flare they may produce pions decaying around 30 MeV neutrino energy . Indeed: • The pions decay in muons and neutrinos • The muon decay in electron and neutrinos that will reach from the Sun to the Earth. • The Earth has 2 main concurrent alternative noises: solar MeVs neutrinos and hundred atmospheric ones • Solar flare may shine first in neutrino and millisecond later in X gamma and Cosmic ray signal at Megaton energy threshold

The Sun Neutrino shining D.Fargion-Stockolm-Neutrino- SNOW -3-May-2006

Neutrino events events by by SN 1987A in SN 1987A in Neutrino LMC in KII LMC in KII D.Fargion- D.Fargion -Stockolm Stockolm- -Neutrino Neutrino- - SNOW - SNOW -3 3- -May May- -2006 2006

Flare- -Supernova Supernova 1987A 1987A Flare energy Fluence Fluence Ratio Ratio energy D.Fargion- D.Fargion -Stockolm Stockolm- -Neutrino Neutrino- - SNOW - -3 3- -May May- -2006 2006 SNOW

Magnetic energy for huge solar flare stored in the surface

X Ray Solar flare sudden shining as a bemed jet

4 November November 2003 2003 4 D.Fargion- D.Fargion -Stockolm Stockolm- -Neutrino Neutrino- - SNOW - SNOW -3 3- -May May- -2006 2006

Huge solar mass ejection and high proton hard spectra Why so so much much interest interest for for the 20 the 20 ° Why ° January Solar Solar Flare Flare for for Neutrinos Neutrinos? ? January D.Fargion- D.Fargion -Stockolm Stockolm- -Neutrino Neutrino- - SNOW - SNOW -3 3- -May May- -2006 2006

The simplest Flare estimate • If the sudden flare proton rain do scatter among the target solar atmosphere (as CR do with our terrestrial atmosphere) the consequent, prompt « solar flare atmosphere neutrino» above tens MeV energy, will be well detactable in Megaton neutrino detector • As the same CR in Earth atmosphere.

Neutrino hitting water makes electrons or muons that running shine lights: Cherenkov rings in SK or future HK 603 MeV atmospheric muon n Note sharp edge of ring from muon produced by n m -nucleon interaction D.Fargion-Stockolm-Neutrino- SNOW -3-May-2006

Deep Core, Pingu Megaton detector inside ICECUBE

Solar flare, before mixing, by neutrino in solar thermonuclear noise versus Solar Flare, SF in SK

Arrival all

Expected event rate by SF

Minimal solar flare energy spectra by gamma at GeV imply detectable neutrino signals in Megaton

Why SK did not reveal yet these signals up to now?

Anyway • The external magnetic line explosions in solar flare may hit rarely external diluted solar atmosphere. • However the lateral or the backward in a more dense solar coronal atmosphere atmosphere may act as an efficent calorimeter • Megaton or few Megaton neutrino detector will soon discover several (or dozen) solar flare neutrino events.

Conclusions: Future HK in Japan and Korea.. • The asiatic neutrino efforts maybe the road map to a solar flare astronomy • Anti neutrino signals, anti electron ones, may be in several event correlated with X-gamma flare • With a noise free solar neutrino background. • Few GeVs muon tracks (due to GeVs solar neutrino flare) may point back to the sun while increasing the whole Megaton neutrino detector mass • Why to care? What it is the social use ? • Satellite security and astronauts lifes may depend on the most fast solar flare neutrino alarm system • Near 2020 the rise the golden age of a new solar neutrino astronomy , possibly of at least two flavors

Thank you for the attention