  Observations of the dynamics of solar coronal structures are necessary to
investigate space weather phenomena and global heating of the corona. The
profiles of high temperature lines emitted by the hot plasma are usually
integrated by narrow band filters or recorded by classical spectroscopy. We
present in this paper details of a new transportable instrument (under
construction) for imaging spectroscopy: the Solar Line Emission Dopplerometer
(SLED). It uses the Multi-channel Subtractive Double Pass (MSDP) technique,
which combines the advantages of both filters and narrow slit spectrographs,
i.e. high temporal, spatial and spectral resolutions. The SLED will measure at
high cadence (1 Hz) the line-of-sight velocities (Doppler shifts) of hot
coronal loops, in the forbidden lines of FeX 637. nm and FeXIV 530.3 nm. It
will follow the dynamics of fast evolving events of solar activity such as
flares or Coronal Mass Ejections (CMEs), and also study coronal heating by
short period waves. Observations will be performed with the coronagraph at the
Lomnicky Stit Observatory (LSO, in Slovakia) or during total eclipses. The SLED
will also observe the dynamics of solar prominences in Halpha 656.3 nm or HeD3
587.6 nm lines when mounted on the Bialkow coronagraph (near Wroclaw, Poland).
It is fully compatible with polarimetric measurements by various techniques.
