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One year of ASPEX-SWIS operation: characteristic features, observations and science potential.

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Title: One year of ASPEX-SWIS operation: characteristic features, observations and science potential.
Authors: Kumar, Abhishek1 (AUTHOR) abhishekkumar@prl.res.in, Parashar, Shivam1,2 (AUTHOR), Kumar, Prashant1 (AUTHOR), Chakrabarty, Dibyendu1 (AUTHOR), Bapat, Bhas1,3 (AUTHOR), Sarkar, Aveek1 (AUTHOR), Shah, Manan S.1 (AUTHOR), Adalja, Hiteshkumar L.1 (AUTHOR), Patel, Arpit R.1 (AUTHOR), Adhyaru, Pranav R.1 (AUTHOR), Shanmugam, M.1 (AUTHOR), Banerjee, Swaroop B.1 (AUTHOR), Subramaniam, K. P.1 (AUTHOR), Ladiya, Tinkal1 (AUTHOR), Sebastian, Jacob1 (AUTHOR), Dalal, Bijoy1 (AUTHOR), Gupta, Aakash1,2 (AUTHOR), Dadhania, M. B.1 (AUTHOR), Vadawale, Santosh V.1 (AUTHOR), Goyal, Shiv Kumar1 (AUTHOR)
Source: Journal of Astrophysics & Astronomy. 8/12/2026, Vol. 47 Issue 2, p1-28. 28p.
Subjects: Solar wind, Coronal mass ejections, Plasma turbulence, Sun, Velocity distribution (Statistical mechanics), Space probes
Geographic Terms: India
Abstract: The Aditya-L1 mission, India's first dedicated solar observatory at the first Lagrange point of the Sun-Earth system, carries the Solar Wind Ion Spectrometer (SWIS) as part of the Aditya Solar Wind Particle Experiment (ASPEX) payload suite. Even before settling down at the Halo orbit, AL1-ASPEX-SWIS has been delivering nearly continuous in situ measurements of solar wind ion spectra. Moments of the velocity distribution function (VDFs) have been calculated to derive the solar wind bulk parameters like density, bulk speed, temperature etc. Through this work, we evaluate the performance of AL1-ASPEX-SWIS through comparisons with contemporaneous measurements from the Wind and DSCOVR spacecrafts. A detailed case study of the 07 August 2024 interplanetary coronal mass ejection (ICME) is presented where sharp transitions in bulk speed, thermal speed, and number density were well-aligned with independent observations, confirming the instrument's capability in capturing dynamic solar wind features. Spectral analysis of kinetic fluctuations revealed a well-defined inertial range with a spectral slope consistent with magnetohydrodynamic (MHD) turbulence. Additionally, a 17-month statistical comparison (January 2024–May 2025) shows strong agreement in bulk velocity ( R 2 ≈ 0.94 with Wind), with expected variability in thermal speed and density due to inter-instrument differences. These results confirm the scientific utility of AL1-ASPEX-SWIS in monitoring both transient events and long-term solar wind conditions. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Astrophysics & Astronomy is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: One year of ASPEX-SWIS operation: characteristic features, observations and science potential.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Astrophysics+%26+Astronomy%22">Journal of Astrophysics & Astronomy</searchLink>. 8/12/2026, Vol. 47 Issue 2, p1-28. 28p.
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  Data: The Aditya-L1 mission, India's first dedicated solar observatory at the first Lagrange point of the Sun-Earth system, carries the Solar Wind Ion Spectrometer (SWIS) as part of the Aditya Solar Wind Particle Experiment (ASPEX) payload suite. Even before settling down at the Halo orbit, AL1-ASPEX-SWIS has been delivering nearly continuous in situ measurements of solar wind ion spectra. Moments of the velocity distribution function (VDFs) have been calculated to derive the solar wind bulk parameters like density, bulk speed, temperature etc. Through this work, we evaluate the performance of AL1-ASPEX-SWIS through comparisons with contemporaneous measurements from the Wind and DSCOVR spacecrafts. A detailed case study of the 07 August 2024 interplanetary coronal mass ejection (ICME) is presented where sharp transitions in bulk speed, thermal speed, and number density were well-aligned with independent observations, confirming the instrument's capability in capturing dynamic solar wind features. Spectral analysis of kinetic fluctuations revealed a well-defined inertial range with a spectral slope consistent with magnetohydrodynamic (MHD) turbulence. Additionally, a 17-month statistical comparison (January 2024–May 2025) shows strong agreement in bulk velocity ( R 2 ≈ 0.94 with Wind), with expected variability in thermal speed and density due to inter-instrument differences. These results confirm the scientific utility of AL1-ASPEX-SWIS in monitoring both transient events and long-term solar wind conditions. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Journal of Astrophysics & Astronomy is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s12036-026-10155-2
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        Text: English
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      – SubjectFull: Solar wind
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      – SubjectFull: Plasma turbulence
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