The DynaMICCS perspective. A mission for a complete and continuous view of the Sun dedicated to magnetism, space weather and space climate

Experimental Astronomy (Impact Factor: 2.97). 03/2009; 23(3):1017-1055. DOI:10.1007/s10686-008-9111-z

ABSTRACT The DynaMICCS mission is designed to probe and understand the dynamics
of crucial regions of the Sun that determine solar variability,
including the previously unexplored inner core, the radiative/convective
zone interface layers, the photosphere/chromosphere layers and the low
corona. The mission delivers data and knowledge that no other known
mission provides for understanding space weather and space climate and
for advancing stellar physics (internal dynamics) and fundamental
physics (neutrino properties, atomic physics, gravitational moments...).
The science objectives are achieved using Doppler and magnetic
measurements of the solar surface, helioseismic and coronographic
measurements, solar irradiance at different wavelengths and in-situ
measurements of plasma/energetic particles/magnetic fields. The
DynaMICCS payload uses an original concept studied by Thalès
Alenia Space in the framework of the CNES call for formation flying
missions: an external occultation of the solar light is obtained by
putting an occulter spacecraft 150 m (or more) in front of a second
spacecraft. The occulter spacecraft, a LEO platform of the mini sat
class, e.g. PROTEUS, type carries the helioseismic and irradiance
instruments and the formation flying technologies. The latter spacecraft
of the same type carries a visible and infrared coronagraph for a unique
observation of the solar corona and instrumentation for the study of the
solar wind and imagers. This mission must guarantee long (one 11-year
solar cycle) and continuous observations (duty cycle > 94%) of
signals that can be very weak (the gravity mode detection supposes the
measurement of velocity smaller than 1 mm/s). This assumes no
interruption in observation and very stable thermal conditions. The
preferred orbit therefore is the L1 orbit, which fits these requirements
very well and is also an attractive environment for the spacecraft due
to its low radiation and low perturbation (solar pressure) environment.
This mission is secured by instrumental R and D activities during the
present and coming years. Some prototypes of different instruments are
already built (GOLFNG, SDM) and the performances will be checked before
launch on the ground or in space through planned missions of CNES and

0 0
  • Source
    [show abstract] [hide abstract]
    ABSTRACT: The symposium has shown the dynamism of this rapidly evolving discipline. I shall concentrate here on some highlights and some complementary informations. I conclude on open questions with some perspectives on solar & stellar activity and related planets. Comment: 17 pages, 13 figures, concluding remarks of IAU264 in RIO, 2009
    Proceedings of the International Astronomical Union 11/2009;
  • [show abstract] [hide abstract]
    ABSTRACT: Two research paths are described to obtain better understanding of the origin of global solar activity. First, observations with a multichannel resonant spectrometer may reveal the dynamics of the solar core, the tachocline, and the temporal evolution of activity between the photosphere and chromosphere. Such new observations will deliver constraints for 3D simulations of solar activity. Second, we examine the ab-initio introduction of a non-force-free field expressed in spherical harmonics into the solar structure equations and estimate its impact on the inner and subsurface layers, its time evolution, and its role in angular momentum transport.
    12/2009: pages 368-373;
  • [show abstract] [hide abstract]
    ABSTRACT: Shrinking or expansion of the solar shape and irradiance variations are ultimately related to solar activity. We give here a review on existing ground-based or space solar radius measurements, extending the concept to shape changes. We show how helioseismology results allow us to look at the variations below the surface, where changes are not uniform, putting in evidence a new shallow layer, the leptocline, which is the seat of solar asphericities, radius variations with the 11-yr cycle and the cradle of complex physical processes: partial ionization of the light elements, opacities changes, superadiabaticity, strong gradient of rotation and pressure. Based on such physical grounds, we show why it is important to get accurate measurements from scheduled dedicated space missions: PICARD, SDO, DynaMICCS, ASTROMETRIA, SPHERIS. Such measurements will provide us a unique opportunity to study in detail the relationship between global solar properties and changes in the Sun's interior.
    Journal of Atmospheric and Solar-Terrestrial Physics 01/2009; · 1.42 Impact Factor

Full-text (2 Sources)

1 Download
Available from
Jan 4, 2013