Long-term cosmic ray/solar activity hysteresis phenomenon and properties of solar wind for the last 200 years

1999 ◽  
Author(s):  
L. I. Dorman ◽  
G. Villoresi ◽  
I. V. Dorman ◽  
N. Iucci ◽  
M. Parisi
Keyword(s):  
Solar Wind ◽  
Solar Activity ◽  
Cosmic Ray ◽  
Hysteresis Phenomenon

The Long Term Cosmic Ray Variation Relevant to Solar Wind Structure in the Outer Heliosphere

1990 ◽  
pp. 199-203
Author(s):  
M.V. Alania ◽  
R.G. Aslamazashvili ◽  
T.B. Bochorishvili ◽  
L.I. Dorman ◽  
R.T. Guschina ◽  
...  
Keyword(s):  
Solar Wind ◽  
Cosmic Ray ◽  
Outer Heliosphere ◽  
Wind Structure ◽  
Solar Wind Structure

scholarly journals Solar Modulation Effects in Terrestrial Production of Carbon-14

Radiocarbon ◽  
1980 ◽  
Vol 22 (2) ◽  
pp. 133-158 ◽  
Author(s):  
Giuliana Castagnoli ◽  
Devendra Lal
Keyword(s):  
Solar Activity ◽  
Cosmic Ray ◽  
Solar Modulation ◽  
Carbon 14 ◽  
Cosmic Ray Modulation ◽  
The Earth ◽  
Secular Variations ◽  
Galactic Cosmic Ray ◽  
Long Term Variations

This paper is concerned with the expected deviations in the production rate of natural 14C on the earth due to changes in solar activity. We review the published estimates of the global production rates of 14C due to galactic and solar cosmic ray particles, and present new estimates of the expected secular variations in 14C production, taking into account the latest information available on galactic cosmic ray modulation and long-term variations in solar activity.

scholarly journals Solar wind fluctuations and solar activity long-term swing: 1963-2012

2013 ◽  
Vol 8 (S300) ◽  
pp. 473-474
Author(s):  
J. L. Zerbo ◽  
C. Amory-Mazaudier ◽  
F. Ouattara
Keyword(s):  
Solar Wind ◽  
Solar Activity ◽  
Coronal Holes ◽  
High Wind ◽  
Contributing Factors ◽  
High Wind Speed ◽  
Close Link ◽  
Solar Events ◽  
Solar Wind Parameters

AbstractIn this study we investigate the time variation of several solar activity, geomagnetic indices, and solar wind parameters (B, V). It is well known that solar wind is one of the main contributing factors to geomagnetic activity and his topology is strongly affect by solar events such as CMEs and coronals. For these two solar events, we study the correlation between PCI and BV during solar cycle phases and point out the close link between PCI and the occurring of CMEs and high wind speed flowing from coronal holes.

scholarly journals Solar activity, 27-day variation and long term modulation of cosmic ray intensity

Solar Physics ◽  
1970 ◽  
Vol 11 (1) ◽  
pp. 151-154 ◽  
Author(s):  
V. K. Balasubrahmanyan ◽  
D. Venkatesan
Keyword(s):  
Solar Activity ◽  
Cosmic Ray ◽  
Cosmic Ray Intensity

scholarly journals Cosmic ray and solar activity influences on long-term variations of cave climate systems

2019 ◽  
Vol 31 ◽  
pp. 61-70
Author(s):  
Alexey Stoev ◽  
Penka Stoeva
Keyword(s):  
Solar Activity ◽  
Environmental Changes ◽  
Temporal Evolution ◽  
Cosmic Ray ◽  
Temporal Variations ◽  
Lower Atmosphere ◽  
Barotropic Fluid ◽  
Dynamical Parameters ◽  
Galactic Cosmic Ray

During the analysis of solar activity impact on climate, the emphasis is placed on temperature changes. Earth's atmosphere is a dynamical system with a complex variability in space and time. Due to the fact that caves in Karst preserve the long term environmental changes, the investigation of the in-caves’ atmospheric parameters and their variations with time becomes very important in the last quarter of century. In this paper we investigate the temporal evolution of the temperature and pressure of the ground atmospheric layer in the region of two Bulgarian caves: Snezhanka (Pazardjik region) and Uhlovitsa (Smolyan region), during the period 2005–2017. We show that thermal and mass exchange of the caves’ air with the environment has significant temporal variations. On annual basis the thermo-dynamical parameters of the observed caves behaves as a barotropic fluid, in which the air density depends only on atmospheric pressure. As a result, the temporal evolution of in-caves’ pressure and temperature change synchronously with time. The observed 11-year signal could be attributed to the heliospheric modulation of galactic cosmic ray (GCR) intensity, which modulates the ozone and humidity near the tropopause and correspondingly the strength of the atmospheric greenhouse effect. Our study helps to clarify the influence of helio-geophysical factors on the state of the lower atmosphere.

Investigation of the coronal heating through phase relation of solar activity indexes

2020 ◽  
Vol 37 ◽  
Author(s):  
K. J. Li ◽  
J. C. Xu ◽  
Z. Q. Yin ◽  
J. L. Xie ◽  
W. Feng
Keyword(s):  
Solar Wind ◽  
Solar Activity ◽  
Phase Relation ◽  
Large Scale ◽  
Solar Rotation ◽  
Rotation Period ◽  
Magnetic Activity ◽  
Coronal Heating ◽  
Small Scale

Abstract The coronal heating problem is a long-standing perplexing issue. In this study, 13 solar activity indexes are used to investigate their phase relation with the sunspot number (SSN). Only three of them are found to statistically significantly lag the SSN (large-scale magnetic activity) by about one solar rotation period; the three indexes are total solar irradiance (TSI), the modified coronal index, and the solar wind velocity; the former two indexes may represent the long-term variation of energy quantity of the heated photosphere and corona, respectively. The Mount Wilson Sunspot Index (MWSI) and the Magnetic Plage Strength Index (MPSI), which reflect the large- and small-scale magnetic field activities, respectively, are also utilised to investigate their phase relations with the three indexes. The three indexes are found to be much more intimately related to MPSI than to MWSI, and MWSI statistically significantly leads TSI by about one rotation period. The heated corona is found to pulse perfectly in step with the small-scale magnetic activity rather than the large-scale magnetic activity; furthermore, combined with observations, our statistical evidence should thus attribute coronal heating firmly to small-scale magnetic activity phenomena, such as spicules, micro-flares, nano-flares, and others. The photosphere and the corona are synchronously heated, which should seemingly prefer magnetic reconnection heating to wave heating. In the long term, such a coronal heating way is inferred effective. Statistically, it is also small-scale magnetic activity phenomena that produce TSI enhancement. Coronal heating and solar wind acceleration are found to be synchronous, as standard models require.

Cosmic-ray long-term variations due to the solar activity for the 22nd solar cycle

1995 ◽  
Vol 16 (9) ◽  
pp. 245-248 ◽  
Author(s):  
L. Marmatsouri ◽  
A. Vassilaki ◽  
H. Mavromichalaki ◽  
B. Petropoulos
Keyword(s):  
Solar Activity ◽  
Solar Cycle ◽  
Cosmic Ray ◽  
Long Term Variations
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