Jagdev Singh/India Experiments
(i) High frequency photometry of the solar corona using photomultiplier tubes
:
We plan to use a 12-inch coelostat and 8-inch objective of 10 feet
focus to form the image of the sun/corona. A 3-inch prism kept near the focus
diverts eastern part of the image in the perpendicular direction and western part
in the other direction. Six fibers each of 250- micron size will be mounted on
the eastern part of the image at 1.2 solar radii and 1.5 solar radii. The light
from these fibers will be fed to six photo- multiplier, R 647 HAMAMATSU, tubes.
An interference filter of 5 A pass- band centered around 5303 A, Fe XIV line will
be mounted before the fibers. The intensity at six locations will be recorded
using photon counting system at the rate of 20 Hz. The dead time for the system
is 10 nano-second. The data obtained during the eclipse will be used to study
the high frequency oscillations in the solar corona.
(ii) Two dimensional photometry of the solar corona using CCD:
A Peltier cooled CCD camera from Photometrics will be mounted on a 10-inch Meade
Telescope having a focal length of 100-inch. A broadband filter will be kept before
the CCD camera. A suitable region on some streamer structure will be choosen.
The size of the coronal region will be restricted to 200 by 1000 arcsec to obtain
the images at faster rate. The pixel size of 24-microns will provide an image
scale of 2 arcsec per pixel. THe data will be obtained at 1.5 Hz. The two dimensional
data obtained will be used to investgate the existence and nature of waves in
the solar corona, if any.
Location of site:
Chadegan
Chadegan is site about 15 Km south of the totality path. This place is about
100 km from Isfahan in Iran. The site is close to a big lake at an altitude
of about 2800 m. It is expected to provide clear sky with good transpareny during
the eclipse.