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A new model has been proposed for magnetic field determination at different distances from the Sun during different solar cycle phases. The model depends on the observed large-scale non-polar photospheric magnetic fields and that measured…

太阳与恒星天体物理 · 物理学 2018-08-08 Irina A. Bilenko

The precise shape of the Sun is sensitive to the influence of gravity, differential rotation, local turbulence and magnetic fields. It has been previously shown that the solar shape exhibits asphericity that evolves with the 11-year cycle.…

太阳与恒星天体物理 · 物理学 2018-08-15 A. G. Kosovichev , J. -P. Rozelot

The observed correlation between global low cloud amount and the flux of high energy cosmic rays supports the idea that ionization plays a crucial role in tropospheric cloud formation. We explore this idea quantitatively with a simple model…

大气与海洋物理 · 物理学 2009-11-07 David Marsden , Richard E. Lingenfelter

The dynamics of the solar radiative interior are still poorly constrained by comparison to the convective zone. This disparity is even more marked when we attempt to derive meaningful temporal variations. Many data sets contain a small…

太阳与恒星天体物理 · 物理学 2015-06-05 Antonio Eff-Darwich , Sylain G. Korzennik

Solar wind-magnetosphere coupling, its causes and consequences have been studied for the last several decades. However, the assessment of continuously changing behaviour of the sun, plasma and field flows in the interplanetary space and…

太阳与恒星天体物理 · 物理学 2013-12-09 Badruddin , O. P. M. Aslam

Galactic cosmic rays (GCRs), the highly energetic particles that may raise critical health issues for astronauts in space, are modulated by solar activity with their intensity lagging behind the sunspot number (SSN) variation by about one…

太阳与恒星天体物理 · 物理学 2022-04-07 Yuming Wang , Jingnan Guo , Gang Li , Elias Roussos , Junwei Zhao

The flux of cosmic rays in the heliosphere is subjected to variations that are related to the Sun's magnetic activity. To study this effect, updated time series of multichannel observations are needed. Here we present a web application that…

空间物理 · 物理学 2022-10-13 David Pelosi , Nicola Tomassetti , Matteo Duranti

The differential intensities of Cosmic Rays at Earth were calculated using a 2D stochastic Montecarlo diffusion code and compared with observation data. We evaluated the effect of stretched and compressed heliospheres on the Cosmic Ray…

太阳与恒星天体物理 · 物理学 2017-08-23 P. Bobik , M. J. Boschini , C. Consolandi , S. Della Torre , M. Gervasi , D. Grandi , K. Kudela , F. Noventa , S. Pensotti , P. G. Rancoita , D. Rozza

The review presents analysis and physical interpretation of available statistical data about solar wind plasma and interplanetary magnetic field (IMF) properties as measured in-situ at 1 A.U. by numerous space experiments during time period…

空间物理 · 物理学 2013-01-15 A. V. Dmitriev , A. V. Suvorova , I. S. Veselovsky

In this paper, we study the galactic cosmic ray (GCR) variations over the solar cycles 23 and 24, with measurements from the NASA's ACE/CRIS instrument and the ground-based neutron monitors (NMs). The results show that the maximum GCR…

太阳与恒星天体物理 · 物理学 2021-06-23 Shuai Fu , Xiaoping Zhang , Lingling Zhao , Yong Li

Severity of warming predicted by climate models depends on their Transient Climate Response (TCR). Inter-model spread of TCR has persisted at ~100% of its mean for decades. Existing observational constraints of TCR are based on observed…

大气与海洋物理 · 物理学 2023-12-25 King-Fai Li , Ka-Kit Tung

The variation with time from 1956-2002 of the globally averaged rate of ionization produced by cosmic rays in the atmosphere is deduced and shown to have a cyclic component of period roughly twice the 11 year solar cycle period. Long term…

地球物理 · 物理学 2009-11-13 A. D. Erlykin , T. Sloan , A. W. Wolfendale

The maximum phase of the solar cycle is characterized by several interesting features in the solar activity, heliospheric characteristics and the galactic cosmic ray (GCR) intensity. Recently the maximum phase of the current solar cycle…

太阳与恒星天体物理 · 物理学 2015-09-03 M. Krainev , G. Bazilevskaya , M. Kalinin , A. Svirzhevskaya , N. Svirzhevsky

To better understand the influence of the activity cycle on the solar atmosphere, we report the time variation of the radius observed at 37 GHz ($\lambda$=8.1 mm) obtained by the Mets\"ahovi Radio Observatory (MRO) through Solar Cycles 22…

太阳与恒星天体物理 · 物理学 2019-12-17 Caius L. Selhorst , Juha Kallunki , C. G. Giménez de Castro , Adriana Valio , Joaquim E. R. Costa

During the recent solar minimum between cycles 23 and 24 (solar minimum $P_{23/24}$) the intensity of Galactic Cosmic Rays (GCRs) measured at the Earth was the highest ever recorded since space age. It is the purpose of this paper to…

太阳与恒星天体物理 · 物理学 2014-12-04 L. -L. Zhao , G. Qin , M. Zhang , B. Heber

Solar activity affects the whole heliosphere and near-Earth space environment. It has been reported in the literature that the mechanism responsible for the solar activity modulation behaves like a low-dimensional chaotic system. Studying…

太阳与恒星天体物理 · 物理学 2017-01-25 M. Stangalini , I. Ermolli , G. Consolini , F. Giorgi

The intensity and energy spectrum of galactic cosmic rays in the heliosphere are significantly influenced by the 11-year solar cycle, a phenomenon known as solar modulation. Understanding this effect and its underlying physical mechanisms…

Galactic cosmic rays (GCRs) inside the heliosphere are affected by magnetic turbulence and Solar wind disturbances which result in the so-called solar modulation effect. To investigate this phenomenon, we have performed a data-driven…

We report our first results on comparing the variations of the solar internal rotation with solar activity, as predicted by non-linear solar dynamo modelling, with helioseismic measurements using the SOHO MDI data.

天体物理学 · 物理学 2007-05-23 S. Vorontsov , R. Tavakol , E. Covas , D. Moss

In this article, we report an evidence of very high and statistically significant relationship between hemispheric asymmetry in solar coronal rotation rate and solar activity. Our approach is based on cross correlation of hemispheric…

太阳与恒星天体物理 · 物理学 2020-10-28 Jaidev Sharma , Anil K Malik , Brajesh Kumar , Hari Om Vats