Abstract
Advanced Astronomy for Heliophysics Plus (ADAHELI+) is a project concept for a small solar and space weather mission with a budget compatible with an European Space Agency (ESA) S-class mission, including launch, and a fast development cycle. ADAHELI+ was submitted to the European Space Agency by a European-wide consortium of solar physics research institutes in response to the Call for a small mission opportunity for a launch in 2017, of March 9, 2012. The ADAHELI+ project builds on the heritage of the former ADAHELI mission, which had successfully completed its phase-A study under the Italian Space Agency 2007 Small Mission Programme, thus proving the soundness and feasibility of its innovative low-budget design. ADAHELI+ is a solar space mission with two main instruments: ISODY+: an imager, based on Fabry-Perot interferometers, whose design is optimized to the acquisition of highest cadence, long-duration, multiline spec- tropolarimetric images in the visible/near-infrared region of the solar spectrum. XSPO: an x-ray polarimeter for solar flares in x-rays with energies in the 15 to 35 keV range. ADAHELI+ is capable of performing observations that cannot be addressed by other currently planned solar space missions, due to their limited telemetry, or by ground-based facilities, due to the problematic effect of the terrestrial atmosphere.©TheAuthors.PublishedbySPIEunder
Highlights
The understanding of solar magnetic field generation and evolution is one of the most outstanding problems in solar and stellar physics.The solar magnetic field is continuously generated and destroyed on timescales ranging from fractions of a second to years, and fills the heliosphere, a volume of space that extends to at least 10 × 109 km from the Sun
Additional science topics related to fundamental physics can be addressed with the X-ray solar polarimeter (XSPO): a long-term accumulation of angular resolved data is suitable to reveal the presence of an x-ray-emitting region from the solar disc center, produced by the interaction of axions particles with local magnetic field and the active regions (ARs) may prove a good probe for searching for the axionic xrays.[62,63]
Interferometer for Solar Dynamics Plus (ISODY+) is a Gregorian telescope interfaced with three main instruments: a narrowband spectropolarimeter, based on Fabry–Pérot interferometer (FPI), a broadband imager for high spatial resolution, and a correlation tracker (CRT) used as an image stabilization system
Summary
The understanding of solar magnetic field generation and evolution is one of the most outstanding problems in solar and stellar physics. The solar magnetic field is continuously generated and destroyed on timescales ranging from fractions of a second to years, and fills the heliosphere, a volume of space that extends to at least 10 × 109 km from the Sun. the solar magnetic field drives solar activity on all timescales from second to centuries, abruptly enhancing the emission of particles and x-ray from our star, and leading to gradual long-term changes in its radiative output. Advanced Astronomy for Heliophysics Plus (ADAHELI+) is the first and only solar space mission designed to provide: (i) multiline spectropolarimetric imaging at high cadence (5 fps) and exceptionally long-duration observations of target regions in the photosphere and chromosphere; (ii) x-ray polarimetry of solar flares in the 15- to 35-keV energy. ADAHELI+ was one of the 26 proposals submitted to the European Space Agency in response to the call for a small mission ESA D/SRE/FF/og28226 issued on March 9, 2012, but was not selected
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