ISRO gearing up for mission to study Sun, satellite arrives at Sriharikota for launch
Bengaluru (PTI): Aditya-L1, the first space-based Indian observatory to study the Sun, is getting ready for its launch soon, ISRO said on Monday.
The satellite, realised at U R Rao Satellite Centre here, has arrived at the ISRO's spaceport in Sriharikota in Andhra Pradesh, the Bengaluru-headquartered national space agency said in an update on the mission.
"Mostly September first week," an ISRO official told PTI when asked about the date of the launch.
The spacecraft is expected to be placed in a halo orbit around the Lagrange point 1 (L1) of the Sun-Earth system, which is about 1.5 million kilometres from the Earth.
A satellite placed in the halo orbit around the L1 point has a major advantage of continuously viewing the Sun without any occultation/eclipses, ISRO noted. "This will provide a greater advantage of observing the solar activities and its effect on space weather in real time," it said.
The spacecraft carries seven payloads to observe the photosphere, chromosphere and the outermost layers of the Sun (the corona) using electromagnetic and particle and magnetic field detectors.
Using the special vantage point L1, four payloads will directly view the Sun and the remaining three payloads would carry out in-situ studies of particles and fields at the L1, thus providing important scientific studies of the propagatory effect of solar dynamics in the interplanetary medium.
"The suits of Aditya L1 payloads are expected to provide most crucial information to understand the problem of coronal heating, coronal mass ejection, pre-flare and flare activities and their characteristics, dynamics of space weather, propagation of particle and fields etc.," ISRO said.
The major science objectives of the Aditya-L1 mission are: study of solar upper atmospheric (chromosphere and corona) dynamics; study of chromospheric and coronal heating, physics of the partially ionised plasma, initiation of the coronal mass ejections, and flares; observe the in-situ particle and plasma environment providing data for the study of particle dynamics from the Sun; physics of solar corona and its heating mechanism; diagnostics of the coronal and coronal loops plasma: temperature, velocity and density; development, dynamics and origin of coronal mass ejections; identify the sequence of processes that occur at multiple layers (chromosphere, base and extended corona) which eventually leads to solar eruptive events; magnetic field topology and magnetic field measurements in the solar corona; drivers for space weather (origin, composition and dynamics of solar wind).
The instruments of Aditya-L1 are tuned to observe the solar atmosphere, mainly the chromosphere and corona, while the in-situ instruments will observe the local environment at L1.
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MP: 40 years after Bhopal gas disaster, toxic waste leaves Union Carbide factory for disposal
Bhopal, Jan 1: Forty years after the Bhopal gas tragedy, the shifting of some 377 tons of hazardous waste began from the defunct Union Carbide factory on Wednesday night for its disposal, an official said.
The toxic waste is being shifted in 12 sealed container trucks to the Pithampur industrial area in Dhar district, 250 km away from Bhopal.
"12 container trucks carrying the waste set off on a non-stop journey around 9 pm. A green corridor has been created for the vehicles which are expected to reach Pithampur industrial area in Dhar district in seven hours," said Bhopal Gas Tragedy Relief and Rehabilitation Department Director Swatantra Kumar Singh.
He said around 100 people worked in 30-minute shifts since Sunday to pack and load the waste in trucks.
"They underwent health check-ups and were given rest every 30 minutes," he added.
Highly toxic methyl isocyanate (MIC) gas leaked from the Union Carbide pesticide factory on the intervening night of December 2-3, 1984, killing at least 5,479 people and leaving thousands with serious and long-lasting health issues. It is considered to be among the worst industrial disasters in the world.
The Madhya Pradesh High Court on December 3 rebuked authorities for not clearing the Union Carbide site in Bhopal despite directions from even the Supreme Court and set a four-week deadline to shift the waste, observing that even 40 years after the gas tragedy, authorities were in a "state of inertia".
The high court bench had warned the government of contempt proceedings if its directive was not followed.
"If everything is found to be fine, the waste will be incinerated within three months. Otherwise, it might take up to nine months," Singh told PTI on Wednesday morning.
Initially, some of the waste will be burnt at the waste disposal unit in Pithampur and the residue (ash) will be examined to find whether any harmful elements are left, Singh said.
The smoke from the incinerator will pass through special four-layer filters so that the surrounding air is not polluted, he added.
Once it is confirmed that no traces of toxic elements are left, the ash will be covered by a two-layer membrane and buried to ensure it does not come in contact with soil and water in any way.
A team of experts under the supervision of officials of the Central Pollution Control Board and State Pollution Control Board will carry out the process, Singh said.
Some local activists have claimed that 10 tons of Union Carbide waste was incinerated on a trial basis in Pithampur in 2015, after which the soil, underground water and water sources in surrounding villages became polluted.
But Singh rejected the claim, stating that the decision to dispose of the waste at Pithampur was taken only after the report of the 2015 test and all the objections were examined.
There would be no reason to worry, he said.
A large number of people had on Sunday taken out a protest march in Pithampur to oppose the disposal of Union Carbide waste in the city which has a population of about 1.75 lakh.
12 trucks carrying 337 tonnes of toxic waste from the Union Carbide factory in Bhopal, stored for 40 years, left at 9:05 p.m. for Pithampur near Indore. The waste is expected to arrive early on January 2nd, following a 250-km green corridor with heavy security.
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