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Behaviour of 27-Day and 13.5-Day Periodicities in Galactic Cosmic Particles as Observed by Spacecraft and Neutron Monitors During Different Solar Polarity Cycles
An analysis has been made of the behaviour of the 27-day and 13.5-day periodicities in proton, C, and O galactic-cosmic-ray (GCR) particles at...
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A possible direct exposure of the Earth to the cold dense interstellar medium 2–3 Myr ago
Cold, dense clouds in the interstellar medium of our Galaxy are 4–5 orders of magnitude denser than their diffuse counterparts. Our Solar System has...
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Recent Developments in Particle Acceleration at Shocks: Theory and Observations
Energetic particles represent an important component of the plasma in the heliosphere. They range from particles accelerated at impulsive events in...
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The Early History of Heliospheric Science and the Spacecraft That Made It Possible
Our understanding of the interaction of the large-scale heliosphere with the local interstellar medium (LISM) has undergone a profound change since...
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Modelization of galactic cosmic-ray short-term variations for LISA
The European Space Agency Laser Interferometer Space Antenna (LISA) will be the first mission dedicated to the detection of low-frequency...
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A comparative study of solar activity parameters during the period 2009–2012 and 2020–2023 (ascending phase of solar cycles 24 and 25)
In this paper, we performed solar synodic period (∼27 days) and heliospheric effect for selected solar activity parameters: sunspot number (SSN),...
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Variations in the Cosmic Ray Flux at the End of Solar Cycle 24
AbstractData from most neutron monitor stations show that the intensity of cosmic rays has not yet reached the level observed at them in 2009. At a...
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Solar Activity in the Past and Its Impacts on Climate
Solar activity is suggested to impact the climate system through the influence of total solar irradiance (TSI), solar ultraviolet (UV), and galactic...
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Current Sheets, Plasmoids and Flux Ropes in the Heliosphere
Our understanding of processes occurring in the heliosphere historically began with reduced dimensionality - one-dimensional (1D) and two-dimensional...
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Reflections on Space Science Research
In addition to the eight scientific debates described in this book, two other important discoveries occurred that were not accompanied by debates....
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Orbits and Background of Gamma-Ray Space Instruments
Gamma-ray telescopes in space are bombarded by large fluxes of charged particles, photons, and secondary neutrons. These particles and radiation pose...
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Five Solar Cycles of Solar Corona Investigations
These are the memoirs of fifty years of research in solar physics, closely related to the history of three of the major solar space missions, from...
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Main Characteristics of the Sun
The Sun is the central body of our Solar System. It is a hot rotating gas sphere with a radius of RS = 6.96 × 1010 cm and a mass of...
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Cosmic ray measurements from Voyager 2 as it crossed into interstellar space
The interaction of the interstellar and solar winds is complex, as revealed by differences in intensities and anisotropies of low-energy ions...
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Modeling the Time Delay Problem of Galactic Cosmic Ray Flux in Solar Cycles 21 and 23
We present a 2-dimensional time-dependent simulation based on Parker’s transport equation (PTE) describing the propagation of energetic...
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A small and round heliosphere suggested by magnetohydrodynamic modelling of pick-up ions
As the Sun moves through the surrounding partially ionized medium, neutral hydrogen atoms penetrate the heliosphere, and through charge exchange with...
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High precision particle astrophysics as a new window on the universe with an Antimatter Large Acceptance Detector In Orbit (ALADInO)
Multimessenger astrophysics is based on the detection, with the highest possible accuracy, of the cosmic radiation. During the last 20 years, the...
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Interstellar Matter
In this section we examine the interstellar matter that resides between stars and is particularly important for star formation.
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Experimental Investigation of the Delay Time in Galactic Cosmic Ray Flux in Different Epochs of Solar Magnetic Cycles: 1959 – 2014
In the present article, we analyze long-term changes in the intensity of galactic cosmic rays (GCRs) in different polarity epochs of the solar...
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Orbits and Background of Gamma-Ray Space Instruments
Gamma-ray telescopes in space are bombarded by large fluxes of charged particles, photons, and secondary neutrons. These particles and radiation pose...
