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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Congress cites Maniben Patel's diary entries, asks Rajnath to apologise for Babri claim
New Delhi (PTI): The Congress on Saturday shared diary entries of Vallabhbhai Patel's daughter from a book to rebut Defence Minister Rajnath Singh's claim that India's first prime minister, Jawaharlal Nehru, wanted to build the Babri masjid using public funds, and demanded that Singh apologise for spreading "falsehoods".
Congress general secretary in charge of communications, Jairam Ramesh, claimed the defence minister was spreading falsehoods to “improve his relationship” with Prime Minister Narendra Modi.
“Here is Maniben's original diary entry in Gujarati on pages 212-213 in the book ‘Samarpit Padchhayo Sardarno’ by CA R S Patel 'Aaresh', published by Sardar Patel Vallabhbhai Patel Memorial Society, 2025,” Ramesh said on X, sharing screenshots of the relevant pages from the book.
“There is a huge difference between what is contained in the original diary entry and what Rajnath Singh ji and his fellow ‘distorians’ are propagating,” Ramesh said.
“The Defence Minister must apologise for the falsehoods he is spreading, simply to improve his relationship with the PM,” he claimed.
The Congress had earlier termed Singh's claim that Nehru wanted to build the Babri masjid using public funds a “lie” and “WhatsApp university story”, and said the defence minister should not walk in Prime Minister Narendra Modi's path.
Addressing a gathering at Sadhli village in Gujarat's Vadodara district last Tuesday, Singh said Nehru wanted to build the Babri masjid using public funds, but Sardar Vallabhbhai Patel didn't allow his plans to succeed.
The BJP had cited a book by Vallabhbhai Patel's daughter to double down on Singh's claims, and said the first prime minister also said he felt "repelled" by some of the temples in south India despite their beauty.
“The source of what Rajnath Singh said is the 'Inside Story of Sardar Patel, Diary of Maniben Patel'," BJP Rajya Sabha MP and national spokesperson Sudhanshu Trivedi had said at a press conference at the party headquarters while responding to media queries on the issue.
Trivedi claimed that on Page 24 of the book, it is written that Nehru also raised the question of the Babri mosque, but Sardar Patel made it clear that the government could not spend any money on building a mosque.
