  The Solar Orbiter mission completed its first remote-sensing observation
windows in the spring of 2022. On 2/4/2022, an M-class flare followed by a
filament eruption was seen both by the instruments on board the mission and
from several observatories in Earth's orbit. The complexity of the observed
features is compared with the predictions given by the standard flare model in
3D. We use the observations from a multi-view dataset, which includes EUV
imaging to spectroscopy and magnetic field measurements. These data come from
IRIS, SDO, Hinode, as well as several instruments on Solar Orbiter. Information
given by SDO/HMI and Solar Orbiter PHI/HRT shows that a parasitic polarity
emerging underneath the filament is responsible for bringing the flux rope to
an unstable state. As the flux rope erupts, Hinode/EIS captures blue-shifted
emission in the transition region and coronal lines in the northern leg of the
flux rope prior to the flare peak. Solar Orbiter SPICE captures the whole
region, complementing the Doppler diagnostics of the filament eruption.
Analyses of the formation and evolution of a complex set of flare ribbons and
loops show that the parasitic emerging bipole plays an important role in the
evolution of the flaring region. While the analysed data are overall consistent
with the standard flare model, the present particular magnetic configuration
shows that surrounding magnetic activity such as nearby emergence needs to be
taken into account to fully understand the processes at work. This filament
eruption is the first to be covered from different angles by spectroscopic
instruments, and provides an unprecedented diagnostic of the multi-thermal
structures present before and during the flare. This dataset of an eruptive
event showcases the capabilities of coordinated observations with the Solar
Orbiter mission.
