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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…
Assessment of CESE-HLLD ambient solar wind model results using multipoint observation
Feng, Xueshang; Wei, Fengsi; Li, Huichao
For a three-dimensional magnetohydrodynamics solar wind model, it is necessary to carry out assessment studies to reveal its ability and limitation. In this paper, the ambient solar wind results of year 2008 generated by the CESE-HLLD 3D MHD model are compared with multipoint in-situ measurements during the late declining phase of solar cycle 23. …