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HiRISE - High-Resolution Imaging and Spectroscopy Explorer - Ultrahigh resolution, interferometric and external occulting coronagraphic science

Robertus Erdélyi 1, 2, 3, * Luc Damé 4 Andrzej Fludra 5 Mihalis Mathioudakis 6 T. Amari 7 B. Belucz 1 F. Berrilli 8 S. Bogachev 9 D. Bolsée 10 V. Bothmer 11 S. Brun 12 S. Dewitte 13 Thierry Dudok de Wit 14 M. Faurobert 15, 16 L. Gizon 17 N. Gyenge 1, 3 M. Korsós 18, 3, 2 N. Labrosse 19 S. Matthews 20 Mustapha Meftah 21 H. Morgan 18 P. Pallé 22 P. Rochus 23 E. Rozanov 24 B. Schmieder 25 K. Tsinganos 26 E. Verwichte 27 S. Zharkov 28 F. Zuccarello 29 R. Wimmer-Schweingruber 30 
* Corresponding author
4 HELIOS - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
21 STRATO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : Recent solar physics missions have shown the definite role of waves and magnetic fields deep in the inner corona, at the chromosphere-corona interface, where dramatic and physically dominant changes occur. HiRISE (High Resolution Imaging and Spectroscopy Explorer), the ambitious new generation ultra-high resolution, interferometric, and coronagraphic, solar physics mission, proposed in response to the ESA Voyage 2050 Call, would address these issues and provide the best-ever and most complete solar observatory, capable of ultra-high spatial, spectral, and temporal resolution observations of the solar atmosphere, from the photosphere to the corona, and of new insights of the solar interior from the core to the photosphere. HiRISE, at the L1 Lagrangian point, would provide meter class FUV imaging and spectroimaging, EUV and XUV imaging and spectroscopy, magnetic fields measurements, and ambitious and comprehensive coronagraphy by a remote external occulter (two satellites formation flying 375 m apart, with a coronagraph on a chaser satellite). This major and state-of-the-art payload would allow us to characterize temperatures, densities, and velocities in the solar upper chromosphere, transition zone, and inner corona with, in particular, 2D very high resolution multi-spectral imaging-spectroscopy, and, direct coronal magnetic field measurement, thus providing a unique set of tools to understand the structure and onset of coronal heating. HiRISE's objectives are natural complements to the Parker Solar Probe and Solar Orbiter-type missions. We present the science case for HiRISE which will address: i) the fine structure of the chromosphere-corona interface by 2D spectroscopy in FUV at very high resolution; ii) coronal heating roots in the inner corona by ambitious externally-occulted coronagraphy; iii) resolved and global helioseismology thanks to continuity and stability of observing at the L1 Lagrange point; and iv) solar variability and space climate with, in addition, a global comprehensive view of UV variability.
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Robertus Erdélyi, Luc Damé, Andrzej Fludra, Mihalis Mathioudakis, T. Amari, et al.. HiRISE - High-Resolution Imaging and Spectroscopy Explorer - Ultrahigh resolution, interferometric and external occulting coronagraphic science. Experimental Astronomy, Springer Link, 2022, (in press). ⟨10.1007/s10686-022-09831-2⟩. ⟨insu-03599110⟩

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