ISRO planning to send probe to sun in 2020; North Korea fires short-range projectiles - Current Affairs
ISRO is planning to send a probe to study the sun early in 2020.
Story 1- ISRO planning to send a probe to study sun in 2020
The Indian Space Research Organization is planning to send a probe to study the sun early in 2020.
The information was shared by ISRO chairman Dr K Sivan, who said that currently scientists are exploring possibilities to study more about Sun and the probe named Aditya-L1 will be sent to observe the solar corona, the outer layers of the Sun.
The satellite would be in a halo orbit around the L1 (Lagrangian point 1) of the Sun-Earth system so that it has the advantage of continuously viewing the Sun without any occultation or eclipses. The L1 is 1.5 million kms from the Earth.
Besides this, the ISRO Chairman said that the mission to send Indian astronauts to space by 2022 is well on the stream.
Initially, Aditya-1 mission was conceived as a 400kg class satellite carrying one payload, the Visible Emission Line Coronagraph (VELC). The mission was planned to launch in a 800 km low earth orbit.
A satellite placed in the halo orbit around the Lagrangian point 1 (L1) of the Sun-Earth system has the major advantage of continuously viewing the Sun without any occultation or eclipses.
The mission's key aim was to observe the solar corona. The outer layers of the Sun, extending to thousands of km above the disc (photosphere) is termed as the corona. It has a temperature of more than a million degree Kelvin which is much higher than the solar disc temperature of around 6000K.
However, the mission has now been revised to “Aditya-L1 mission” and will be inserted in a halo orbit around the L1, which is 1.5 million km from the Earth. The satellite carries additional six payloads with enhanced science scope and objectives.
Aditya-L1 with additional experiments can now provide observations of Sun's Photosphere (soft and hard X-ray), Chromosphere (UV) and corona (Visible and NIR). In addition, particle payloads will study the particle flux emanating from the Sun and reaching the L1 orbit, and the magnetometer payload will measure the variation in magnetic field strength at the halo orbit around L1.
These payloads have to be placed outside the interference from the Earth’s magnetic field and could not have been useful in the low earth orbit.
Lately, ISRO has been making all-out efforts to launch Chandrayaan-2 in the launch window between July 9 and 16, with the aim of making a soft landing near the south pole of the moon by September 6.
Story 2- North Korea fires short-range 'projectiles' into sea: Seoul
North Korea on May 4, 2019 launched unidentified projectiles into the sea, as per claims of the South Korean military. If indeed true, it would be the North's first short-range missile launch since more than a year. It comes as the nation seeks to put pressure on the United States amidst deadlock in nuclear talks.
The United States and North Korea have been at loggerheads since the collapse of a summit between Kim Jong Un and Donald Trump in February, where the two sides clashed over sanctions and the extent of North's concessions on its atomic arsenal.
• According to South Korea's Joint Chief of Staff, North Korea fired a number of short-range projectiles from its Hodo peninsula near the east coast town of Wonsan to the northeastern direction.
• The projectiles travelled from 70 to 200 kilometres (45 to 125 miles) towards the East Sea, also known as the Sea of Japan.
• In an earlier statement, South Korea had stated that Pyongyang had launched an unidentified short-range missile.
• The last North Korean missile launch was in November 2017.
The latest firing comes just a day after South Korean Foreign Minister Kang Kyung-wha said that the North Korea should show "visible, concrete and substantial" denuclearisation action if it wants sanctions relief.
The issue was also at the centre of the talks that took place between the US and the North Korea in Hanoi in February 2019. During the talks, North Korea had demanded immediate sanctions relief, but the two sides disagreed on what the North should give up in return.
However, since the North Korean leader Kim Jong-Un held historic summits with US President Donald Trump and South Korean leader Moon Jae-in, the North did not carry out any missile or nuclear tests,
The Hodo Peninsula, from where the alleged firing took place, has been used as a training area for "live-fire testing, training exercises for artillery and coastal defence cruise missiles" since the 1960s.
The region has been increasingly used for ballistic missile and long-range artillery rocket testing during the last 10 years.