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Modelling solar irradiance from ground-based photometric observations

Chatzistergos, Theodosios; Ermolli, Ilaria; Giorgi, Fabrizio +2 more

Total solar irradiance (TSI) has been monitored from space since 1978, i.e. for about four solar cycles. The measurements show a prominent variability in phase with the solar cycle, as well as fluctuations on timescales shorter than a few days. However, the measurements were done by multiple and usually relatively short-lived missions. The differe…

Synoptic solar observations of the Solar Flare Telescope focusing on space weather

Sakurai, Takashi; Hanaoka, Yoichiro; Morita, Satoshi +2 more

The solar group at the National Astronomical Observatory of Japan is conducting synoptic solar observation with the Solar Flare Telescope. While it is a part of a long-term solar monitoring, contributing to the study of solar dynamo governing solar activity cycles, it is also an attempt at contributing to space weather research. The observations i…

The Electron Proton Helium INstrument as an example for a Space Weather Radiation Instrument

Heber, Bernd; Malandraki, Olga; Posner, Arik +3 more

The near-Earth energetic particle environment has been monitored since the 1970's. With the increasing importance of quantifying the radiation risk for, e.g. for the human exploration of the Moon and Mars, it is essential to continue and further improve these measurements. The Electron Proton Helium INstrument (EPHIN) on-board SOHO continually pro…