  Aims: We study the characteristics of intermediate drift bursts (fibers)
embedded in the July 14, 2000 large solar event. Methods: We used dynamic
spectra from the acousto-optic analyzer (SAO) of the ARTEMIS-JLS solar
radiospectrograph, in conjunction with high time resolution images from the
Nanc cay Radioheliograph (NRH) and EUV images from TRACE . We computed both
2-dimensional and 1-dimensional images and applied high pass time filtering to
the images and the dynamic spectrum in order to enhance the fibers. For the
study of the background continuum emission we used images averaged over several
seconds. Results: All fibers in the SAO dynamic spectra are identifiable in the
NRH images. Fibers were first detected after the primary energy release in a
moving type IV, probably associated with the rapid eastward expansion of the
flare and the postflare loop arcade. They appeared as a 10% modulation of the
continuum intensity. The fibers and the continuum were strongly circularly
polarized in the ordinary mode sense, indicating fundamental plasma emission.
We detected discrete fiber sources along two ~300, Mm long parallel stripes,
apparently segments of large scale loops encompassing both the EUV loops and
the flux rope. We found multiple fiber emissions at slightly different
positions and times; their consecutive appearance can give the impression of
apparent motion with supra-luminal velocities. Images of individual fibers were
very similar at 432.0 and 327.0 MHz. From the position shift of the sources and
the time delays at low and high frequencies we estimated, for a well observed
group of fibers, the exciter speed and the frequency scale length along the
loops; we obtained consistent values from imaging and spectral data, supporting
the whistler origin of the fiber emission. The fibers in absorption and in
emission are very similar as manifestations of the same wave train.
