Dr Muhammed Aslam Ottupara
- Research Associate (Mathematics)
https://orcid.org/0000-0001-9521-3874Research interests
Our research focuses on forecasting and understanding solar flares and coronal mass ejections (CMEs), specifically through the study of active region topology. By analyzing the magnetic configurations of solar active regions, we aim to predict solar flare and CME events, which play a key role in shaping space weather. These solar phenomena have significant impacts on Earth’s magnetosphere, causing geomagnetic storms that affect satellite communications, power grids, and other space-based technologies.
In our research on high-energy charged particles, including galactic cosmic rays (GCRs) and solar energetic particles (SEPs), we investigate their modulation in the heliosphere and the effects of solar activity on their transport and acceleration. Using numerical modeling, we study how the solar wind and solar magnetic fields influence the intensity and composition of galactic cosmic rays (GCRs) as they propagate through space.
A key area of our research is the study of the acceleration and transport mechanisms of high-energy charged particles, including the role of solar magnetic field reversals and interstellar conditions. We also focus on the search for antimatter through cosmic antiparticles, exploring their modulation in the heliosphere and their potential implications for dark matter research.
Research groups
Publications
2025
Aslam, O.P.M. 
ORCID: https://orcid.org/0000-0001-9521-3874, Mactaggart, D. ORCID: https://orcid.org/0000-0003-2297-9312, Battiston, R., Potgieter, M.S. and Ngobeni, M.D.
(2025)
The source of the 2017 cosmic ray half-year modulation event.
Astrophysical Journal,
(Accepted for Publication)
2024
Aslam, O.P.M. ORCID: https://orcid.org/0000-0001-9521-3874, Mactaggart, D. ORCID: https://orcid.org/0000-0003-2297-9312, Williams, T., Fletcher, L. ORCID: https://orcid.org/0000-0001-9315-7899 and Romano, P.
(2024)
Photospheric signatures of CME onset.
Monthly Notices of the Royal Astronomical Society, 534(1),
pp. 444-454.
(doi: 10.1093/mnras/stae2110)
Articles
Aslam, O.P.M. ORCID: https://orcid.org/0000-0001-9521-3874, Mactaggart, D. ORCID: https://orcid.org/0000-0003-2297-9312, Battiston, R., Potgieter, M.S. and Ngobeni, M.D.
(2025)
The source of the 2017 cosmic ray half-year modulation event.
Astrophysical Journal,
(Accepted for Publication)
Aslam, O.P.M. ORCID: https://orcid.org/0000-0001-9521-3874, Mactaggart, D. ORCID: https://orcid.org/0000-0003-2297-9312, Williams, T., Fletcher, L. ORCID: https://orcid.org/0000-0001-9315-7899 and Romano, P.
(2024)
Photospheric signatures of CME onset.
Monthly Notices of the Royal Astronomical Society, 534(1),
pp. 444-454.
(doi: 10.1093/mnras/stae2110)
Prior publications
Article
M.D. Ngobeni, M.S. Potgieter, O.P.M. Aslam (2024) Towards understanding time variations of proton to helium ratios in the heliosphere: Implication for the time dependence of the elements of the diffusion tensor Advances in Space Research Crossref. (doi: 10.1016/j.asr.2023.12.025)
M. Aguilar et al. (2023) Temporal Structures in Positron Spectra and Charge-Sign Effects in Galactic Cosmic Rays Physical Review Letters Aslam O.P.M.. ISSN 1079-7114 (doi: 10.1103/physrevlett.131.151002)
O. P. M. Aslam, M. S. Potgieter, Xi 熙 Luo 罗, M. D. Ngobeni (2023) Modulation of Cosmic-Ray Antiprotons in the Heliosphere: Simulations for a Solar Cycle The Astrophysical Journal Crossref. (doi: 10.3847/1538-4357/ace31e)
M. Aguilar et al. (2023) Properties of Cosmic-Ray Sulfur and Determination of the Composition of Primary Cosmic-Ray Carbon, Neon, Magnesium, and Sulfur: Ten-Year Results from the Alpha Magnetic Spectrometer Physical Review Letters Aslam O.P.M.. ISSN 1079-7114 (doi: 10.1103/physrevlett.130.211002)
O. P. M. Aslam, Xi 熙 Luo 罗, M. S. Potgieter, M. D. Ngobeni, Xiaojian 小健 Song 宋 (2023) Unfolding Drift Effects for Cosmic Rays over the Period of the Sun’s Magnetic Field Reversal The Astrophysical Journal Crossref. (doi: 10.3847/1538-4357/acc24a)
M.D. Ngobeni, M.S. Potgieter, O.P.M. Aslam, D. Bisschoff, I.I. Ramokgaba, D.C. Ndiitwani (2022) Simulations of the solar modulation of Helium isotopes constrained by observations Advances in Space Research Aslam O.P.M.. ISSN 0273-1177 (doi: 10.1016/j.asr.2021.12.018)
N. Marcelli et al. (2022) Helium Fluxes Measured by the PAMELA Experiment from the Minimum to the Maximum Solar Activity for Solar Cycle 24 The Astrophysical Journal Letters Crossref. (doi: 10.3847/2041-8213/ac4787)
B. Badruddin, O. P. M. Aslam, M. Derouich (2022) Study of the development of geomagnetic storms in the magnetosphere using solar wind data of three different time resolutions Astrophysics and Space Science Aslam O.P.M.. ISSN 1572-946X (doi: 10.1007/s10509-021-04030-5)
Marius S. Potgieter, O. P. M. Aslam, Driaan Bisschoff, Donald Ngobeni (2021) A Perspective on the Solar Modulation of Cosmic Anti-Matter Physics Crossref. (doi: 10.3390/physics3040076)
B. Badruddin, O.P.M. Aslam, M. Derouich, S. Qutub (2021) Study of the development and mechanism of large amplitude decreases in cosmic ray intensity during geomagnetic disturbances in the magnetosphere Advances in Space Research Crossref. (doi: 10.1016/j.asr.2021.08.019)
D. Bisschoff, O. P. M. Aslam, M. D. Ngobeni, V. V. Mikhailov, M. Boezio, R. Munini, M. S. Potgieter (2021) On the Very Local Interstellar Spectra for Helium, Positrons, Antiprotons, Deuteron, and Antideuteron Physics of Atomic Nuclei Aslam O.P.M.. ISSN 1562-692X (doi: 10.1134/s1063778821130068)
Mikhail Krainev, Mikhail Kalinin, O.P.M. Aslam, Donald Ngobeni, Marius S Potgieter (2021) On the dependence of maximum GCR intensity on heliospheric factors for the last five sunspot minima Advances in Space Research Aslam O.P.M.. ISSN 0273-1177 (doi: 10.1016/j.asr.2021.05.021)
M. B. Krainev, M. S. Kalinin, O. P. M. Aslam, D. Ngobeni, M. S. Potgieter (2021) Solar Minima 20/21–24/25 and the Dependence of the Maximum Intensity of Galactic Cosmic Rays on Heliospheric Factors Bulletin of the Russian Academy of Sciences: Physics Aslam O.P.M.. ISSN 1934-9432 (doi: 10.3103/s1062873821100191)
B. Badruddin, O. P. M. Aslam, M. Derouich (2021) Study of the recovery characteristics of intense cosmic-ray decreases Astrophysics and Space Science Aslam O.P.M.. ISSN 1572-946X (doi: 10.1007/s10509-021-03968-w)
O. P. M. Aslam, D. Bisschoff, M. D. Ngobeni, M. S. Potgieter, R. Munini, M. Boezio, V. V. Mikhailov (2021) Time and Charge-sign Dependence of the Heliospheric Modulation of Cosmic Rays The Astrophysical Journal Crossref. (doi: 10.3847/1538-4357/abdd35)
N. Marcelli et al. (2020) Time Dependence of the Flux of Helium Nuclei in Cosmic Rays Measured by the PAMELA Experiment between 2006 July and 2009 December The Astrophysical Journal Crossref. (doi: 10.3847/1538-4357/ab80c2)
Modzelewska, R. et al. (2020) Study of the 27 Day Variations in GCR Fluxes during 2007–2008 Based on PAMELA and ARINA Observations Astrophysical Journal Scopus - Elsevier. ISSN 15384357 0004637X (doi: 10.3847/1538-4357/abbdac)
Ngobeni, M.D., Aslam, O.P.M., Bisschoff, D., Potgieter, M.S., Ndiitwani, D.C., Boezio, M., Marcelli, N., Munini, R., Mikhailov, V.V., Koldobskiy, S.A. (2020) The 3D numerical modeling of the solar modulation of galactic protons and helium nuclei related to observations by PAMELA between 2006 and 2009 Astrophysics and Space Science Scopus - Elsevier. ISSN 1572946X 0004640X (doi: 10.1007/s10509-020-03896-1)
D. Bisschoff, M. S. Potgieter, O. P. M. Aslam (2019) New Very Local Interstellar Spectra for Electrons, Positrons, Protons, and Light Cosmic Ray Nuclei The Astrophysical Journal Crossref. (doi: 10.3847/1538-4357/ab1e4a)
O. P. M. Aslam, D. Bisschoff, M. S. Potgieter, M. Boezio, R. Munini (2019) Modeling of Heliospheric Modulation of Cosmic-Ray Positrons in a Very Quiet Heliosphere The Astrophysical Journal Crossref. (doi: 10.3847/1538-4357/ab05e6)
B. Badruddin, O. P. M. Aslam, M. Derouich, H. Asiri, K. Kudela (2019) Forbush Decreases and Geomagnetic Storms During a Highly Disturbed Solar and Interplanetary Period, 4–10 September 2017 Space Weather Crossref. (doi: 10.1029/2018SW001941)
O. P. M. Aslam, Badruddin (2017) Study of the Geoeffectiveness and Galactic Cosmic-Ray Response of VarSITI-ISEST Campaign Events in Solar Cycle 24 Solar Physics Crossref Metadata Search. ISSN 0038-0938 (doi: 10.1007/s11207-017-1160-x)
O. P. M. Aslam, Badruddin (2015) Study of Cosmic-Ray Modulation During the Recent Unusual Minimum and Mini-Maximum of Solar Cycle 24 Solar Physics Crossref Metadata Search. ISSN 0038-0938 (doi: 10.1007/s11207-015-0753-5)
Badruddin, O.P.M. Aslam (2015) Influence of cosmic-ray variability on the monsoon rainfall and temperature Journal of Atmospheric and Solar-Terrestrial Physics Crossref Metadata Search. ISSN 1364-6826 (doi: 10.1016/j.jastp.2014.11.005)
O.P.M. Aslam, Badruddin (2014) Study of the influence of solar variability on a regional (Indian) climate: 1901–2007 Advances in Space Research Crossref Metadata Search. ISSN 0273-1177 (doi: 10.1016/j.asr.2014.06.019)
Badruddin, O.P.M. Aslam (2013) Study of the solar wind-magnetosphere coupling on different time scales Planetary and Space Science Crossref Metadata Search. ISSN 0032-0633 (doi: 10.1016/j.pss.2013.06.006)
O. P. M. Aslam, Badruddin (2013) Similarities and Distinctions in Cosmic-Ray Modulation During Different Phases of Solar and Magnetic Activity Cycles Solar Physics Crossref Metadata Search. ISSN 0038-0938 (doi: 10.1007/s11207-013-0459-5)
O. P. M. Aslam, Badruddin (2012) Solar Modulation of Cosmic Rays during the Declining and Minimum Phases of Solar Cycle 23: Comparison with Past Three Solar Cycles Solar Physics Crossref Metadata Search. ISSN 0038-0938 (doi: 10.1007/s11207-012-9970-3)
Conference Proceedings
Vladimir Mikhailov, S.Y. Aleksandrin, S.A. Koldobskiy, M. Boezio, R. Munini, O.P.M ASlam, D. Bisschoff, M.D. Ngobeni, M.S. Potgieter, CALET Collaboration (2021) Study of the modulation of Galactic positrons and electrons in 2006-2016 with the PAMELA Experiment Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021) Aslam O.P.M.. (doi: 10.22323/1.395.1307)
Mikhail Krainev, Boris Gvozdevsky, Mikhail Kalinin, O.P.M. Aslam, Donald Ngobeni, Marius Potgieter (2021) On the solar poloidal magnetic field as one of the main factors for maximum GCR intensity for the last five sunspot minima Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021) Aslam O.P.M.. (doi: 10.22323/1.395.1322)
Mikhail Krainev, Mikhail Kalinin, Boris Gvozdevsky, O.P.M. Aslam, Donald Ngobeni, Marius Potgieter (2021) On the transition from 3D to 2D transport equations for a study of long-term cosmic-ray intensity variations in the heliosphere Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021) Aslam O.P.M.. (doi: 10.22323/1.395.1323)
Alex Lenni, Mirko Boezio, Riccardo Munini, Wolfgang Menn, Nadir Marcelli, Marius Potgieter, Driaan Bisschoff, M. D. Ngobeni, O.P.M. Aslam, PAMELA collaboration (2021) Study of the solar modulation for the cosmic ray isotopes with the PAMELA experiment Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021) Aslam O.P.M.. (doi: 10.22323/1.395.1310)
Nadir Marcelli, Mirko Boezio, Riccardo Munini, Alex Lenni, Donald Ngobeni, O. P. M. Aslam, Driaan Bisschoff, Marius Potgieter, PAMELA collaboration (2021) A full solar cycle of proton and helium measurements Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021) Aslam O.P.M.. (doi: 10.22323/1.395.1283)
Dzivhuluwani Ndiitwani, Donald Ngobeni, O.P.M ASlam, Driaan Bischoff, Marius Potgieter, Mirko Boezio, Riccardo Munini, Vladimir Mikhailov (2021) A simulation study of galactic proton modulation from solar minimum to maximum conditions Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021) Aslam O.P.M.. (doi: 10.22323/1.395.1327)
Mabedle Donald Ngobeni, O.P.M Aslama, D. Bisschoffa, D.C Ndiitwania, M.S Potgieterc, M. Boeziod, N. Marcellie, R. Muninid, V.V Mikhailov, S.A Koldobskiyf (2021) Combined heliospheric modulation of galactic protons and helium nuclei from solar minimum to maximum activity related to observations by PAMELA. Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021) Aslam O.P.M.. (doi: 10.22323/1.395.1337)
Riccardo Munini, Mirko Boezio, Driaan Bisschoff, Nadir Marcelli, Donald Ngobeni, O. P. M Aslam, Marius Potgieter (2021) SOLAR MODULATION OF GALACTIC-COSMIC RAY ANTIPROTONS Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021) Aslam O.P.M.. (doi: 10.22323/1.395.1328)
Mikhailov, V.V., Aleksandrin, S.Y., Koldobskiy, S.A., Boezio, M., Munini, R., Ngobeni, M.D., Aslam, O.P.M., Potgieter, M.S. (2020) Precision measurements of cosmic ray electron and positron spectra above 50 MeV with the PAMELA magnetic spectrometer Journal of Physics: Conference Series Scopus - Elsevier. ISSN 17426596 17426588 (doi: 10.1088/1742-6596/1690/1/012004)
Ngobeni, M.D., Potgieter, M.S., Aslam, O.P.M., Bisschoff, D. (2019) Effects of scattering parameters on charge-sign dependent cosmic ray modulation Proceedings of Science Scopus - Elsevier. ISSN 18248039
Munini, R., Aslam, O.P.M., Bisschoff, D., Boezio, M., Lenni, A., Menn, W., Marcelli, N., Potgieter, M.S. (2019) Isotope solar modulation with the PAMELA experiment Proceedings of Science Scopus - Elsevier. ISSN 18248039
Aslam, O.P.M., Bisschoff, D., Potgieter, M.S. (2019) The heliospheric modulation of electrons and positrons over a complete solar cycle Proceedings of Science Scopus - Elsevier. ISSN 18248039
Aslam, O.P.M., Bisschoff, D., Potgieter, M.S. (2019) The solar modulation of protons and anti-protons Proceedings of Science Scopus - Elsevier. ISSN 18248039
N. Marcelli et al. (2019) Time dependence of the helium flux measured by PAMELA EPJ Web of Conferences Aslam O.P.M.. ISSN 2100-014X (doi: 10.1051/epjconf/201920901004)
Marcelli, N., Boezio, M., Lenni, A., Martucci, M., Menn, W., Munini, R., Sparvoli, R., Aslam, O.P.M., Bisschoff, D., Potgieter, M.S. (2019) Time dependence of the proton and helium fluxes measured by PAMELA during solar minimum (2006 - 2009) Proceedings of Science Scopus - Elsevier. ISSN 18248039
Anand Kumar, Aslam O.P.M., Badruddin (2014) SOLAR SOURCES OF HIGH-SPEED STREAMS AND THEIR INFLUENCE ON COSMIC RAY INTENSITY National Seminar on Solar Plasma Processes & Cosmic Ray Modulation Aslam O.P.M..
O. P. M. Aslam (2013) Fluctuations in the interplanetary electric potential and energy coupling between the solar-wind and the magnetosphere The Bulletin of the Astronomical Society of India (BASI), ASI Conference Series, 10, 103-106 Aslam O.P.M.. (doi: 10.48550/ARXIV.1312.2003)
Badruddin, Aslam, O.P.M., Singhy, M. (2009) Influence of solar and cosmic-ray variablity on climate 31st International Cosmic Ray Conference, ICRC 2009 Scopus - Elsevier.
