STEREOSCOPIC MEASUREMENTS OF CORONAL DOPPLER VELOCITIES ABOARD SOLAR ORBITER

PODLADCHIKOVA, O. ; HARRA, L.K.; BARCZYNSKI, K.; MANDRINI, C.H.; AUCHÉRE, F.; BUCHLIN, E. ; DOLLA, L. ; MIERLA, M.; PARENTI, S.; RODRIGUEZ, L.

Reunión virtual

Congreso; Comittee on Space Research General Assembly; 2021

COSPAR

The Solar Orbiter mission, whose orbit is outside the Sun-Earth line, opens up novel opportunitiesfor the combined analysis of measurements by solar imagers and spectrometers. For the firsttime different spectrometers will be located at wide angles with each other allowing 3D spectroscopyin the solar atmosphere. In order to develop a methodology for these opportunities wemake use of the Hinode EUV Imaging Spectrometer (EIS) and Atmospheric Imaging Assembly(AIA) on the Solar Dynamics Observatory (SDO) and by employing solar rotation we simulatethe measurements of spectrometers that have different views of solar corona. The resulting dataallows us to apply stereoscopic tie-pointing and triangulation techniques designed for SECCHI(Sun Earth Connection Coronal and Heliospheric Investigation) imaging suite on the STEREO(Solar Terrestrial Relations Observatory) spacecraft pair and perform three-dimensional analysisof Doppler shifts of quasi-stationary active region.We present a technique that allows theaccurate reconstruction of the 3D velocity vector in plasma flows along open and closed magneticloops. This technique will be applied to the real situation of two spacecraft at differentseparations with spectrometers onboard. This will include the Solar Orbiter Spectral Imagingof the Coronal Environment (SPICE), the Solar Orbiter Extreme Ultraviolet Imager (EUI),the Interface Region Imaging Spectrograph (IRIS) and Hinode EIS spectrometers and we summarisehow these can be coordinated. This 3D spectroscopy is a new research domain that willaid the understanding of the complex flows that take place throughout the solar atmosphere.