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class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2106.13344">arXiv:2106.13344</a> <span> [<a href="https://arxiv.org/pdf/2106.13344">pdf</a>, <a href="https://arxiv.org/format/2106.13344">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Solar and Stellar Astrophysics">astro-ph.SR</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1051/0004-6361/202140980">10.1051/0004-6361/202140980 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First light observations of the solar wind in the outer corona with the Metis coronagraph </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Romoli%2C+M">M. Romoli</a>, <a href="/search/?searchtype=author&query=Antonucci%2C+E">E. Antonucci</a>, <a href="/search/?searchtype=author&query=Andretta%2C+V">V. Andretta</a>, <a href="/search/?searchtype=author&query=Capuano%2C+G+E">G. E. Capuano</a>, <a href="/search/?searchtype=author&query=Da+Deppo%2C+V">V. Da Deppo</a>, <a href="/search/?searchtype=author&query=De+Leo%2C+Y">Y. De Leo</a>, <a href="/search/?searchtype=author&query=Downs%2C+C">C. Downs</a>, <a href="/search/?searchtype=author&query=Fineschi%2C+S">S. Fineschi</a>, <a href="/search/?searchtype=author&query=Heinzel%2C+P">P. Heinzel</a>, <a href="/search/?searchtype=author&query=Landini%2C+F">F. Landini</a>, <a href="/search/?searchtype=author&query=Liberatore%2C+A">A. Liberatore</a>, <a href="/search/?searchtype=author&query=Naletto%2C+G">G. Naletto</a>, <a href="/search/?searchtype=author&query=Nicolini%2C+G">G. Nicolini</a>, <a href="/search/?searchtype=author&query=Pancrazzi%2C+M">M. Pancrazzi</a>, <a href="/search/?searchtype=author&query=Sasso%2C+C">C. Sasso</a>, <a href="/search/?searchtype=author&query=Spadaro%2C+D">D. Spadaro</a>, <a href="/search/?searchtype=author&query=Susino%2C+R">R. Susino</a>, <a href="/search/?searchtype=author&query=Telloni%2C+D">D. Telloni</a>, <a href="/search/?searchtype=author&query=Teriaca%2C+L">L. Teriaca</a>, <a href="/search/?searchtype=author&query=Uslenghi%2C+M">M. Uslenghi</a>, <a href="/search/?searchtype=author&query=Wang%2C+Y+M">Y. M. Wang</a>, <a href="/search/?searchtype=author&query=Bemporad%2C+A">A. Bemporad</a>, <a href="/search/?searchtype=author&query=Capobianco%2C+G">G. Capobianco</a>, <a href="/search/?searchtype=author&query=Casti%2C+M">M. Casti</a>, <a href="/search/?searchtype=author&query=Fabi%2C+M">M. Fabi</a> , et al. (43 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2106.13344v1-abstract-short" style="display: inline;"> The investigation of the wind in the solar corona initiated with the observations of the resonantly scattered UV emission of the coronal plasma obtained with UVCS-SOHO, designed to measure the wind outflow speed by applying the Doppler dimming diagnostics. Metis on Solar Orbiter complements the UVCS spectroscopic observations, performed during solar activity cycle 23, by simultaneously imaging the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.13344v1-abstract-full').style.display = 'inline'; document.getElementById('2106.13344v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2106.13344v1-abstract-full" style="display: none;"> The investigation of the wind in the solar corona initiated with the observations of the resonantly scattered UV emission of the coronal plasma obtained with UVCS-SOHO, designed to measure the wind outflow speed by applying the Doppler dimming diagnostics. Metis on Solar Orbiter complements the UVCS spectroscopic observations, performed during solar activity cycle 23, by simultaneously imaging the polarized visible light and the HI Ly-alpha corona in order to obtain high-spatial and temporal resolution maps of the outward velocity of the continuously expanding solar atmosphere. The Metis observations, on May 15, 2020, provide the first HI Ly-alpha images of the extended corona and the first instantaneous map of the speed of the coronal plasma outflows during the minimum of solar activity and allow us to identify the layer where the slow wind flow is observed. The polarized visible light (580-640 nm), and the UV HI Ly-alpha (121.6 nm) coronal emissions, obtained with the two Metis channels, are combined in order to measure the dimming of the UV emission relative to a static corona. This effect is caused by the outward motion of the coronal plasma along the direction of incidence of the chromospheric photons on the coronal neutral hydrogen. The plasma outflow velocity is then derived as a function of the measured Doppler dimming. The static corona UV emission is simulated on the basis of the plasma electron density inferred from the polarized visible light. This study leads to the identification, in the velocity maps of the solar corona, of the high-density layer about +/-10 deg wide, centered on the extension of a quiet equatorial streamer present at the East limb where the slowest wind flows at about (160 +/- 18) km/s from 4 Rs to 6 Rs. Beyond the boundaries of the high-density layer, the wind velocity rapidly increases, marking the transition between slow and fast wind in the corona. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.13344v1-abstract-full').style.display = 'none'; document.getElementById('2106.13344v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 June, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> A&A, 2021, Forthcoming article </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1911.08462">arXiv:1911.08462</a> <span> [<a href="https://arxiv.org/pdf/1911.08462">pdf</a>, <a href="https://arxiv.org/format/1911.08462">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Solar and Stellar Astrophysics">astro-ph.SR</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1051/0004-6361/201935338">10.1051/0004-6361/201935338 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Metis: the Solar Orbiter visible light and ultraviolet coronal imager </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Antonucci%2C+E">Ester Antonucci</a>, <a href="/search/?searchtype=author&query=Romoli%2C+M">Marco Romoli</a>, <a href="/search/?searchtype=author&query=Andretta%2C+V">Vincenzo Andretta</a>, <a href="/search/?searchtype=author&query=Fineschi%2C+S">Silvano Fineschi</a>, <a href="/search/?searchtype=author&query=Heinzel%2C+P">Petr Heinzel</a>, <a href="/search/?searchtype=author&query=Moses%2C+J+D">J. Daniel Moses</a>, <a href="/search/?searchtype=author&query=Naletto%2C+G">Giampiero Naletto</a>, <a href="/search/?searchtype=author&query=Nicolini%2C+G">Gianalfredo Nicolini</a>, <a href="/search/?searchtype=author&query=Spadaro%2C+D">Daniele Spadaro</a>, <a href="/search/?searchtype=author&query=Teriaca%2C+L">Luca Teriaca</a>, <a href="/search/?searchtype=author&query=Berlicki%2C+A">Arkadiusz Berlicki</a>, <a href="/search/?searchtype=author&query=Capobianco%2C+G">Gerardo Capobianco</a>, <a href="/search/?searchtype=author&query=Crescenzio%2C+G">Giuseppe Crescenzio</a>, <a href="/search/?searchtype=author&query=Da+Deppo%2C+V">Vania Da Deppo</a>, <a href="/search/?searchtype=author&query=Focardi%2C+M">Mauro Focardi</a>, <a href="/search/?searchtype=author&query=Frassetto%2C+F">Fabio Frassetto</a>, <a href="/search/?searchtype=author&query=Heerlein%2C+K">Klaus Heerlein</a>, <a href="/search/?searchtype=author&query=Landini%2C+F">Federico Landini</a>, <a href="/search/?searchtype=author&query=Magli%2C+E">Enrico Magli</a>, <a href="/search/?searchtype=author&query=Malvezzi%2C+A+M">Andrea Marco Malvezzi</a>, <a href="/search/?searchtype=author&query=Massone%2C+G">Giuseppe Massone</a>, <a href="/search/?searchtype=author&query=Melich%2C+R">Radek Melich</a>, <a href="/search/?searchtype=author&query=Nicolosi%2C+P">Piergiorgio Nicolosi</a>, <a href="/search/?searchtype=author&query=Noci%2C+G">Giancarlo Noci</a>, <a href="/search/?searchtype=author&query=Pancrazzi%2C+M">Maurizio Pancrazzi</a> , et al. (78 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1911.08462v1-abstract-short" style="display: inline;"> Metis is the first solar coronagraph designed for a space mission capable of performing simultaneous imaging of the off-limb solar corona in both visible and UV light. The observations obtained with Metis aboard the Solar Orbiter ESA-NASA observatory will enable us to diagnose, with unprecedented temporal coverage and spatial resolution, the structures and dynamics of the full corona from 1.7… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.08462v1-abstract-full').style.display = 'inline'; document.getElementById('1911.08462v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1911.08462v1-abstract-full" style="display: none;"> Metis is the first solar coronagraph designed for a space mission capable of performing simultaneous imaging of the off-limb solar corona in both visible and UV light. The observations obtained with Metis aboard the Solar Orbiter ESA-NASA observatory will enable us to diagnose, with unprecedented temporal coverage and spatial resolution, the structures and dynamics of the full corona from 1.7 $R_\odot$ to about 9 $R_\odot$. Due to the uniqueness of the Solar Orbiter mission profile, Metis will be able to observe the solar corona from a close vantage point (down to 0.28 AU), achieving out-of-ecliptic views with the increase of the orbit inclination over time. Moreover, observations near perihelion, during the phase of lower rotational velocity of the solar surface relative to the spacecraft, will allow longer-term studies of the coronal features. Thanks to a novel occultation design and a combination of a UV interference coating of the mirrors and a spectral bandpass filter, Metis images the solar corona simultaneously in the visible light band, between 580 and 640 nm, and in the UV H I Lyman-伪 line at 121.6 nm. The coronal images in both the UV Lyman-伪 and polarised visible light are obtained at high spatial resolution with a spatial scale down to about 2000 km and 15000 km at perihelion, in the cases of the visible and UV light, respectively. A temporal resolution down to 1 second can be achieved when observing coronal fluctuations in visible light. The Metis measurements will allow for complete characterisation of the main physical parameters and dynamics of the electron and neutral hydrogen/proton plasma components of the corona in the region where the solar wind undergoes acceleration and where the onset and initial propagation of coronal mass ejections take place, thus significantly improving our understanding of the region connecting the Sun to the heliosphere. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.08462v1-abstract-full').style.display = 'none'; document.getElementById('1911.08462v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 November, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2019. </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a 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