Solar wind particle experiment payload onboard Aditya-L1 starts operations: ISRO
Bengaluru (PTI): The Aditya Solar wind Particle Experiment payload onboard India's Aditya-L1 satellite has commenced its operations and is performing normally, ISRO said on Saturday.
ISRO's Polar Satellite Launch Vehicle (PSLV-C57) on September 2 had successfully launched the Aditya-L1 spacecraft, from the second launch pad of Satish Dhawan Space Centre, Sriharikota.
Aditya-L1 is the first Indian space-based observatory to study the Sun from a halo orbit around first Sun-earth Lagrangian point (L1), which is located
roughly 1.5 million km from Earth.
In a statement, ISRO said Aditya Solar wind Particle Experiment (ASPEX) comprises two cutting-edge instruments 'the Solar Wind Ion Spectrometer (SWIS) and SupraThermal and Energetic Particle Spectrometer (STEPS). The STEPS instrument was operational on September 10, 2023. The SWIS instrument was activated on November 2, 2023, and has exhibited optimal performance.
"SWIS, utilising two sensor units with a remarkable 360 field of view each, operates in planes perpendicular to one another," the statement read.
According to ISRO, the instrument has successfully measured solar wind ions, primarily protons and alpha particles.
A sample energy histogram acquired from one of the sensors over two days in November 2023 illustrates variations in proton and alpha particle (doubly ionized helium, He2+) counts, the agency said.
"These variations were recorded with nominal integration time, providing a comprehensive snapshot of solar wind behaviour," ISRO said.
The directional capabilities of SWIS enable precise measurements of solar wind protons and alphas, contributing significantly to addressing longstanding questions about solar wind properties, underlying processes, and their impact on Earth, the space agency explained.
"The change in the proton and alpha particle number ratio, as observed by SWIS, holds the potential to provide indirect information about the arrival of Coronal Mass Ejections (CMEs) at the Sun-Earth Lagrange Point L1," ISRO said.
Enhanced alpha-to-proton ratio is often regarded as one of the sensitive markers of the passage of interplanetary coronal mass ejections (ICMEs) at the L1 and hence considered crucial for space weather studies.
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PM Modi's 'friendship' with President Trump proving to be hollow: Congress
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New Delhi (PTI): The Congress on Saturday alleged that Prime Minister Narendra Modi's "much boasted friendship" with US President Donald Trump is now proving to be "hollow" and cited several overtures the latter recently made to Pakistan.
In a post on X, Congress general secretary, communications, Jairam Ramesh also alleged that Indian diplomacy was failing in the light of the US partnering with Pakistan.
"The abject failure of Indian diplomacy, especially in the past two months, is revealed most tellingly by four facts. These expose the tall claims made by the Prime Minister and his drum-beaters and cheerleaders," he said in his post.
Ramesh said that since May 10, 2025, Trump has claimed 25 times that "he personally intervened to stop Operation Sindoor, threatening India and Pakistan that if they didn't bring the war to a halt, they would not have a trade agreement with the USA."
On June 10, 2025, he claimed, Gen Michael Kurilla, the head of the US Central Command, hailed Pakistan as a phenomenal partner of the US in countering terrorism.
On June 18, 2025, Trump held an unprecedented luncheon meeting with Pakistan Army Chief Field Marshal Asim Munir in the White House, Ramesh noted.
"Two months earlier, Munir's inflammatory, incendiary, and communally provocative remarks had provided the backdrop to the brutal Pahalgam terror attacks on April 22, 2025," he said.
Just yesterday, the Congress leader claimed that US Secretary of State Marco Rubio met Pakistani Deputy Prime Minister Ishaq Dar and thanked Pakistan for its partnership in countering terrorism and preserving regional stability.
"The PM's clean chit to China on June 19, 2020, has already cost India heavily. His much boasted friendship with President Trump is now proving to be hollow," Ramesh said in his post.
