Browsing Faculty of Natural and Agricultural Sciences by Subject "Sun: activity"
Now showing items 1-8 of 8
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Difference in the heliospheric modulation of cosmic-ray protons and electrons during the solar minimum period of 2006 to 2009
(EDP Sciences, 2017)Context. The PAMELA experiment observed galactic proton and electron spectra down to 70 MV and 400 MV, respectively, from mid-2006 to the end of 2009 during what is called an A < 0 solar magnetic polarity cycle. During ... -
The effect of a dynamic inner heliosheath thickness on cosmic-ray modulation
(IOP Publishing, 2015)The time-dependent modulation of galactic cosmic rays in the heliosphere is studied over different polarity cycles by computing 2.5 GV proton intensities using a two-dimensional, time-dependent modulationmodel. By ... -
Modeling of heliospheric modulation of cosmic-ray positrons in a very quiet heliosphere
(IOP Publishing, 2019)Heliospheric modulation conditions were unusually quiet during the last solar minimum activity between solar cycles 23 and 24. Fortunately, the PAMELA space experiment measured 6 month–averaged Galactic positron spectra ... -
New evidence for charge-sign-dependent modulation during the solar minimum of 2006 to 2009
(IOP Publishing, 2017)The PAMELA space experiment, in orbit since 2006, has measured cosmic rays (CRs) through the most recent period of minimum solar activity with the magnetic field polarity as A < 0. During this entire time, galactic electrons ... -
Numerical modeling of galactic cosmic-ray proton and helium observed by AMS-02 during the solar maximum of solar cycle 24
(IOP Publishing, 2019)Galactic cosmic rays (GCRs) are affected by solar modulation while they propagate through the heliosphere. The study of the time variation of GCR spectra observed at Earth can shed light on the underlying physical ... -
A numerical study of cosmic proton modulation using AMS-02 observations
(IOP Publishing, 2019)Since 2011 May, the Alpha Magnetic Spectrometer (AMS-02) on board the International Space Station has provided monthly cosmic proton fluxes for various low-rigidity levels (P<50 GV). These precise measurements, in terms ... -
A numerical study of Forbush decreases with a 3D cosmic-ray modulation model based on an SDE approach
(IOP Publishing, 2017)Based on the reduced diffusion mechanism for producing Forbush decreases (Fds) in the heliosphere, we constructed a three-dimensional (3D) diffusion barrier, and by incorporating it into a stochastic differential equation ... -
A study of Electron Forbush decreases with a 3D SDE numerical model
(IOP Publishing, 2018)Because of the precise measurements of the cosmic ray electron flux by the PAMELA and AMS02, Electron Forbush decreases (Fds) have recently been observed for the first time. This serves as motivation to perform a numerical ...