  A magnetic flux rope (FR), hosting hot plasma, is thought to be central to
the physics of coronal mass ejection. Such FRs are widely observed with
passbands of the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics
Observatory (SDO), that are sensitive to emission from the hot plasma around 10
MK. In contrast, observations of warmer (around 1 MK) counterparts of FRs are
sparse. In this study, we report the failed eruption of a multi-thermal FR,
hosting both hot and warm plasma. On 2015 May 1, a hot channel appeared in the
AIA high temperature passbands out of the southeastern solar limb to the south
of a nearby flare, and then erupted outward. During the eruption, it rotated
perpendicular to the erupting direction. The hot channel stopped erupting, and
disappeared gradually, showing a failed eruption. During the hot channel
eruption, a warm channel appeared sequentially in the AIA low temperature
passbands. It underwent the similar evolution, including the failed eruption,
rotation, and disappearance, to the hot channel. A bright compression front is
formed in front of the warm channel eruption in AIA low temperature images.
Under the hot and warm channel eruptions, a small flare occurred, upon which
several current sheets, connecting the erupting channels and the underneath
flare, formed in the AIA high temperature passbands. Investigating the spatial
and temporal relation between the hot and warm channels, we suggest that both
channels twist together, constituting the same multi-thermal FR that has plasma
with the high and low temperatures.
