Reading Comprehension Practice: Part 7
Every
day, since 1904, staff at the Kodaikanal Solar Observatory in Tamil Nadu have
aimed their telescope at the sun, freezing the images of its disc. This data,
spanning a hundred years and more, has now been digitised by astrophysicists
from the Indian Institute of Astrophysics, Bengaluru, and made available to the
public.
Apart from use in academic studies of long-term behaviour of
the sun, the data can be used to better understand sunspot activity which
impacts climate and affects telecommunication systems. It also throws light on
major events in the past which had an impact on the earth’s magnetic field.
“From that knowledge we may understand the current and future events with
greater precision. This also allows us to predict future [sunspot] activity
levels with better accuracy,” says Dipankar Banerjee, IIAP, the Principal
Investigator.
While ‘spectroheliograms’ were taken at the Kodai observatory
since 1902, it was in 1909 that the data was used to discover the Evershed
effect – those gases in the sunspots flowed radially outwards. The discovery by
John Evershed put the KSO at par with the best observatories in the world. But
its importance eventually declined as it was not upgraded or maintained. In a
backhanded way, though, this turned out to be beneficial, because “the pictures
had all been taken with the same instrument over the years, and this made it
much easier to calibrate and digitise,” says Sudip Mandal, a Ph.D student who
has worked on the project.
The data is unique not only in that it spans a hundred years,
but that there are three sets of images, taken using different filters – White
light, H-alpha and Calcium-K. It is known that the sun has a layered structure,
and each of these data sets exposes a different layer.
Under white light filtering, the sun’s photosphere and the
sunspots are visible, while the Calcium-K light can show layers some 2,000 km
above this, in the chromosphere. The H-alpha images show up layers a little
above the Calcium-K images. Features called “filaments” which are related to
large expulsions of material from the sun’s surface can be viewed in the sets.
Opening up the digitised data has attracted international
attention: Max Planck Institute, Gottingen; National Astronomical Observatories
of China, Beijing and Big Bear Solar Observatory, US are interested in studying
the way the sun’s luminosity changes. Though the sun appears to have a steady
brightness, its luminosity actually undergoes changes over time. Some of the
groups. The Big Bear Solar Observatory and the Beijing teams are interested in
the H-alpha data in order to study the filaments that can be observed in those
shots. Within India, groups from IUCAA, Pune; Physical Research Laboratory,
Ahmedabad; and IISER, Kolkata, want to make studies.
A movie that the scientists made out of a sequence of
hundreds of white light images shows how the sunspots appear and disappear
periodically over an eleven-year cycle. Such movies offer immense possibilities
for developing educational software, as classes of students can visually
experience how the sun and the sunspots behave over the years. Just like CERN
offers its data to science hobbyists, for analysis that does not require much
training and yet cannot be carried out without human intervention, this data,
too, could be used by science fora in India to build citizen science projects.
The data was historically archived in photographic plates and
film. After the digitisation, the images are preserved in high-resolution
digital format. “We store it in FITS [flexible image transport system] which is
the most commonly used digital file format,” clarifies Dr Banerjee.
The project which was initiated about six years ago by S.S.
Hasan, then the director of IIAP, has succeeded in converting to digitised
format some sixty-seventy thousand images previously stored in photographic
plates. The team includes scientists and the big team of research assistants at
the Kodaikanal lab.
At the moment, the group has released the “lowest level” or
raw data and plans are on to eventually release the processed ones, too.
(1).
Consider the following statement regarding the ‘Kodaikanal Solar Observatory’:
1. The data from observatory can be used to better understand
sunspot activity which impacts climate.
2. The data from ovservatory can be used to better understand
sunspot activity which affects telecommunication systems.
Which of the following statements given above is/are correct?
(a) 1 only
(b) 2 only
(c) Both are correct
(d) None is correct
(2). Where is Kodaikanal Solar Observatory located?
(a) Kerala
(b) Karnataka
(c) Andhra Pradesh
(d) Tamil Nadu
(3).
The data collected by ‘Kodaikanal Solar Observatory’ has been digitised by
(a) The Indian Institute of Technology
(b) The Indian Institute of Astrophysics
(c) The Tata Institute of Fundamental Research
(d) None of the above
(4). National Astronomical Observatories of China, Beijing and Big Bear Solar
Observatory, US are interested in studying
(a) Calcium-K light
(b) the way the sun’s luminosity changes
(c) White light
(d) All of the above
(5).
Which of the following instiutes in India want to make studies in the same
field as National Astronomical Observatories of China, Beijing and Big Bear
Solar Observatory, US?
(a) IISER, Kolkata
(b) IUCAA, Pune
(c) Physical Research Laboratory, Ahmedabad
(d) All of the above
(6).
Choose the word which is Most Opposite to the word printed in bold in the
passage.
Radially
(a) Spiral
(b) Spreading
(c) Spoked
(d) Asymmetric
(7). Choose the word which is Most Similar to the word printed in bold in the
passage.
Calibrate
(a) Overhaul
(b) Disorganize
(c) Damage
(d) derange
(8). Choose the word which is Most Opposite to the word printed in bold in the
passage.
Expulsions
(a) Banishment
(b) Discharge
(c) Debarment
(d) import
(9).
Choose the word which is Most Similar to the word printed in bold in the
passage.
Immense
(a) Teeny
(b) Finite
(c) Insignificant
(d) Humongous
(10). Choose the word which is Most Opposite to the word printed in bold in the
passage.
Archived
(a) Chronicles
(b) Scrolls
(c) Extracts
(d) None of the above
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