Article
Engineering, Aerospace
Beena Bhatt, Harish Chandra
Summary: This paper reports Forbush decreases (FD) in cosmic ray intensity during the whole Solar Cycle 23rd, from January 1996 to December 2008. Statistical analysis is conducted on 152 events with available information on solar flare position, flare classes, and Coronal Mass Ejections (CME) speed. FD parameters from the Forbush Effects and Interplanetary Disturbances databases are used in the analysis, obtained through processing data from the worldwide neutron monitor network using the global survey method (GSM). The study examines the impact of these events on interplanetary space and the decrease of galactic cosmic rays (GCR) near Earth, revealing a strong correlation between FDs and solar flares. Statistical analysis is also performed on the magnitude of the CR decrease with solar and geomagnetic parameters.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Engineering, Aerospace
Jaesik Jeong, Suyeon Oh
Summary: This study examines the seasonal variation and origin of neutron intensity as secondary cosmic rays using data from 16 neutron monitors. The results show clear seasonal trends and differences between groups, indicating the combination of terrestrial and extraterrestrial effects. The findings provide insights into the various sources contributing to seasonal trends.
ADVANCES IN SPACE RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
S. El. Shalaby, H. A. Motaweh, M. Y. Hanfi, M. I. Sayyed, A. A. Darwish, A. Sh. M. Elshoukrofy
Summary: The Forbush effect is a phenomenon of irregular variations in the cosmic ray flux, primarily involving a decrease and recovery in the intensity of cosmic rays. Recent interest in the Forbush effect has been driven by its strong relationship with solar-terrestrial physics. Research indicates that different stations exhibit different behaviors, with subpolar stations showing distinct patterns compared to mid-latitude stations.
RESULTS IN PHYSICS
(2022)
Article
Engineering, Aerospace
Mihailo Savic, Nikola Veselinovic, Aleksandar Dragic, Dimitrije Maletic, Dejan Jokovic, Vladimir Udovicic, Radomir Banjanac, David Knezevic
Summary: By combining in situ measurements by space-borne instruments with ground-based cosmic ray observations, the relationship between solar energetic particle flux, various solar activity indices, and cosmic ray intensity measurements during Forbush decreases is investigated. A cross-correlation study is presented using data from the SOHO/ERNE instrument and neutron monitor detectors, indicating that power exponents used to model energetic particle fluence spectra could be valuable new parameters in similar analysis of these phenomena. They appear to be better predictor variables of Forbush decrease magnitude in interplanetary magnetic field than coronal mass ejection velocities.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Astronomy & Astrophysics
Roshan Kumar Mishra, Ashok Silwal, Rabin Baral, Binod Adhikari, Carlos Roberto Braga, Sujan Prasad Gautam, Priyanka Kumari Das, Yenca Migoya-Orue
Summary: We analyzed the behavior of cosmic-ray intensity during five geomagnetic events and found that the characteristics of Forbush Decreases (FDs) after geomagnetic storms were atypical, showing multiple-stage decrements. We also detected singularities in cosmic-ray intensity using the Discrete Wavelet Transform technique. The results revealed a strong correlation between IMF-Bz, Dst index, and FD.
Article
Geochemistry & Geophysics
Kalpesh Ghag, Prathmesh Tari, Anil Raghav, Zubair Shaikh, Omkar Dhamane, Utsav Panchal, Greg Hilbert, Mayuri Katvankar, Komal Choraghe, Digvijay Mishra, Kishor Kumbhar
Summary: This study investigates the effects of eight extreme storms induced by interplanetary coronal mass ejections (ICME) on the profiles of Forbush decreases (FD) observed by neutron monitors. The research finds that the sudden storm commencement of the geomagnetic storm (GS) coincides with the onset of the FD, and there is a gradual increase in neutron counts during the main and recovery phases of the GS. Furthermore, it is observed that the enhancement in cosmic ray flux during the Forbush decrease is contributed by the magnetospheric disturbance of the geomagnetic storm.
JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
(2023)
Article
Engineering, Aerospace
Agnieszka Gil, Alexander Mishev, Stepan Poluianov, Ilya Usoskin
Summary: A study found that the count rates of ground-based neutron monitors exhibit diurnal variability, with the Dome C NM being almost insensitive to this variation compared to other polar NMs. This difference is related to the narrow asymptotic-direction cone of the Dome C NM, making it the only detector accepting cosmic-ray particles from the off-equatorial region. This finding is important for studying cosmic-ray transport near Earth and anisotropic solar energetic particle events.
ADVANCES IN SPACE RESEARCH
(2022)
Article
Physics, Multidisciplinary
O. Okike, J. A. Alhassan
Summary: Solar wind disturbances and solar-terrestrial parameters are interconnected. Data selection is a challenging problem in solar-terrestrial studies. This study improves the selection method for Forbush events and uses a coincident computer program to analyze the relationship between solar-terrestrial variables and Forbush events. The results show that solar-terrestrial parameters fluctuate simultaneously with Forbush events.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Engineering, Aerospace
Eduardo Tirado-Bueno, J. Eduardo Mendoza-Torres, Rafael R. S. de Mendonca
Summary: Several studies have shown that cosmic ray intensity variations can be useful for analyzing and predicting space weather and climate phenomena. Data from neutron monitors are significantly affected by atmospheric pressure changes. Research has found a logarithmic or linear relationship between pressure effect and cutoff rigidity.
ADVANCES IN SPACE RESEARCH
(2021)
Article
Environmental Sciences
Jone Vencloviene, Margarita Beresnevaite, Sonata Cerkauskaite, Nijole Ragaisyte, Rugile Pilviniene, Rimantas Benetis
Summary: This study aimed to investigate the association between heart rate variability (HRV) parameters and geomagnetic activity (GMA), solar wind, and cosmic ray intensity (CRI) in patients who underwent coronary artery bypass grafting or valve surgery. The results showed that low GMA and low solar wind speed may affect certain HRV variables in patients after surgery, and the GMA during the surgery may have a long-term impact on HRV variability.
Article
Astronomy & Astrophysics
Siqi Wang, Veronica Bindi, Cristina Consolandi, Claudio Corti, Christopher Light, Nikolay Nikonov, Andrew Kuhlman
Summary: A Forbush decrease (FD) refers to the sudden reduction of Galactic Cosmic Rays (GCRs) caused by intense solar wind transients, such as Interplanetary Coronal Mass Ejections (ICMEs) and Corotating Interaction Regions (CIRs). With the analysis of daily proton fluxes measured by AMS-02 from May 2011 to October 2019, a total of 142 FD events were identified using an automated systematic analysis method. The study found that both ICME and CIR FDs can be better described by an exponential function in terms of the rigidity dependence of GCR flux decrease. Furthermore, the FD amplitude of ICME FDs showed a moderate correlation with solar wind parameters, while no significant correlation was found for CIR FD events.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Natalya Kilifarska, Klaudio Peqini
Summary: The sensitivity of atmospheric ozone to geomagnetic storms and reduced cosmic rays' intensity (called Forbush decrease [FD]) has been noticed for many years. However, it is still unclear what the factors affecting ozone density are. Analyzing two strong geomagnetic storms, accompanied by FDs, and another FD occurred in geomagnetically quiet conditions, we conclude that observed ozone changes support the idea about the existence of an additional source of ozone in the lower stratosphere.
EARTH AND SPACE SCIENCE
(2023)
Article
Astronomy & Astrophysics
Natalya Kilifarska, Klaudio Peqini
Summary: The study investigates the factors influencing the density of atmospheric ozone, particularly during geomagnetic storms and Forbush decreases. The results suggest the existence of an additional source of ozone in the lower stratosphere, driven by ion-molecular reactions initiated by secondary ionization from cosmic radiation. The depletion of ozone is found to be most severe in areas with the greatest reduction in cosmic ray flux. Additionally, changes in sea level pressure were observed to correlate with changes in ozone density.
EARTH AND SPACE SCIENCE
(2023)
Article
Astronomy & Astrophysics
Beena Bhatt, Harish Chandra
Summary: We examined the Forbush decreases (FDs) associated with solar flares and coronal mass ejections (CMEs) from January 2008 to December 2019, comparing them to the findings of a previous study. Through statistical analysis, we found that the northern 11-20 degrees latitude band had the highest number of FD-associated flare events. Further analysis was conducted on the two most significant events.
Article
Geosciences, Multidisciplinary
Gregory S. Bowers, Xuan-Min Shao, William Blaine, Brenda Dingus, David M. Smith, Jeff Chaffin, John Ortberg, Hamid K. Rassoul, Cheng Ho, Lukas Nellen, Nissim Fraija, C. Alvarez, J. C. Arteaga-Velazquez, V. Baghmanyan, E. Belmont-Moreno, K. S. Caballero-Mora, A. Carraminana, S. Casanova, E. De la Fuente, M. M. Gonzalez, F. Hueyotl-Zahuantitla, O. Martinez, J. A. Matthews, E. Moreno, M. Newbold, E. G. Perez-Perez, I. Torres
Summary: The study reports anomalously long duration count rate bursts following the impact of cosmic ray showers, termed neutron bursts, near a LaBr3 scintillation detector in Mexico. The characteristic spectra and count rates of these bursts are well explained by neutron absorption in the ground, suggesting similar neutron bursts may be produced by other natural phenomena such as Terrestrial gamma ray flashes.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Astronomy & Astrophysics
D. Lingri, H. Mavromichalaki, A. Belov, E. Eroshenko, V. Yanke, A. Abunin, M. Abunina
Article
Astronomy & Astrophysics
D. Lingri, H. Mavromichalaki, A. Belov, M. Abunina, E. Eroshenko, A. Abunin
Article
Astronomy & Astrophysics
Stephan G. Heinemann, Manuela Temmer, Niko Heinemann, Karin Dissauer, Evangelia Samara, Veronika Jercic, Stefan J. Hofmeister, Astrid M. Veronig
Article
Astronomy & Astrophysics
Evangelia Samara, Spiros Patsourakos, Manolis K. Georgoulis
Summary: Recent studies show that coronal mass ejections (CMEs) triggered by magnetically active superflare can pose a threat to the habitability of terrestrial exoplanets by depriving them of their atmospheres. The authors develop a constraint based on CME impacts and apply it to six famous exoplanets, suggesting that only Kepler-438b may have atmospheric sustainability against stellar CMEs.
ASTROPHYSICAL JOURNAL LETTERS
(2021)
Article
Astronomy & Astrophysics
E. Samara, R. F. Pinto, J. Magdalenic, N. Wijsen, V Jercic, C. Scolini, I. C. Jebaraj, L. Rodriguez, S. Poedts
Summary: This study focuses on improving the EUHFORIA model by replacing the default coronal setup with the MULTI-VP model and comparing their outputs for high speed wind streams (HSSs) at 0.1 AU and 1 AU. The results show that the combination of MULTI-VP+EUHFORIA-heliosphere can accurately reproduce HSS plasma and magnetic signatures measured at L1, indicating the importance of both the coronal model and input magnetogram in predicting solar wind conditions at Earth.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
D. Lingri, H. Mavromichalaki, M. Abunina, A. Belov, E. Eroshenko, I Daglis, A. Abunin
Summary: This study aims to define precursory signals that are not related to sudden storm commencements (SSCs). Neutron Monitor Network data, as well as data on solar flares, CMEs, solar-wind speed, interplanetary magnetic field, and geomagnetic indices, were used for the analysis. Precursory signals were identified in 17 out of 27 events without SSCs.
Article
Astronomy & Astrophysics
Stefan J. Hofmeister, Astrid M. Veronig, Stefaan Poedts, Evangelia Samara, Jasmina Magdalenic
ASTROPHYSICAL JOURNAL LETTERS
(2020)