HiRISE Mission to Address the Dynamical Chromosphere- Corona Interface

Abstract : Several ground facilities and space missions are currently dedicated to the study of the Sun at high resolution and of the solar corona in particular. However, and despite significant progress with the advent of space missions and UV, EUV and XUV direct observations of the hot chro-mosphere and million degrees coronal plasma, much is yet to be achieved in the understanding of these high temperatures, fine dissipative structures and of the coronal heating in general. Recent missions have shown the definite role of waves and of the magnetic field deep in the inner corona, at the chromosphere-corona interface, where dramatic changes occur. The dynamics of the chromosphere and corona is controlled by the emerging magnetic field, guided by the coronal magnetic field. Accordingly, the direct measurement of the chromospheric and coronal magnetic fields is of prime importance. The solar corona consists of many thin loops or threads with the plasmas brightening and fading independently. The dynamics in each thread is believed to be related to the formation of filaments, each one being dynamic, in a non-equilibrium state. The mechanism sustaining that dynamics, oscillations or waves (Alfvén or MHD?), require both very high-cadence, multi-spectral observations, and high resolution. This is foreseen in the future Space Mission HiRISE, the ultimate new generation ultrahigh resolution, interferomet-ric and coronagraphic, Solar Physics Mission, proposed for ESA Cosmic Vision (pre-selected in 2007, and under preparation for 2012 second call). HiRISE (High Resolution Imaging and Spectroscopy Explorer), at the L1 Lagrangian point, provides meter class FUV imaging and spectro-imaging, EUV and XUV imaging and spectroscopy, and ultimate coronagraphy by a remote external occulter (satellites in formation flying 280 m apart) allowing to characterize temperature, densities and velocities in the solar upper chromosphere, transition zone and inner corona with, in particular, 2D very high resolution multi-spectral imaging-spectroscopy, direct coronal magnetic field measurement: a unique set of tools to understand the structuration and onset of coronal heating. We give a detail account of the proposed mission profile, major scien-tific objectives and model payload of HiRISE, a natural complement to the Solar Probe type missions lacking duty cycle, high resolution, spatial, spectral and temporal multi-temperature diagnostics and full coronal magnetometry.
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Submitted on : Wednesday, August 21, 2013 - 2:31:10 PM
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  • HAL Id : hal-00852785, version 1

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Luc Damé, Philippe Lamy, Robert von Fay-Siebenburgen (erdélyi). HiRISE Mission to Address the Dynamical Chromosphere- Corona Interface. 38th COSPAR Scientific Assembly, Jul 2010, Bremen, Germany. ⟨hal-00852785⟩

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