scholarly journals Planetary period oscillations in Saturn's magnetosphere: Examining the relationship between abrupt changes in behavior and solar wind‐induced magnetospheric compressions and expansions

2015 ◽  
Vol 120 (11) ◽  
pp. 9524-9544 ◽  
Author(s):  
G. Provan ◽  
C. Tao ◽  
S. W. H. Cowley ◽  
M. K. Dougherty ◽  
A. J. Coates
Keyword(s):  
Solar Wind ◽  
Abrupt Changes ◽  
The Relationship

Abrupt changes of density in sporadic solar wind and their effect on Earth magnetosphere

2015 ◽  
Vol 53 (6) ◽  
pp. 411-422 ◽  
Author(s):  
V. A. Parkhomov ◽  
N. L. Borodkova ◽  
V. G. Eselevich ◽  
M. V. Eselevich
Keyword(s):  
Solar Wind ◽  
Abrupt Changes

scholarly journals Tests for coronal electron temperature signatures in suprathermal electron populations at 1 AU

2017 ◽  
Vol 35 (6) ◽  
pp. 1275-1291 ◽  
Author(s):  
Allan R. Macneil ◽  
Christopher J. Owen ◽  
Robert T. Wicks
Keyword(s):  
Solar Wind ◽  
Electron Temperature ◽  
Energy Content ◽  
The Sun ◽  
Particle Interactions ◽  
Core Electron ◽  
Suprathermal Electron ◽  
Electron Distributions ◽  
The Relationship ◽  
Coronal Electron

Abstract. The development of knowledge of how the coronal origin of the solar wind affects its in situ properties is one of the keys to understanding the relationship between the Sun and the heliosphere. In this paper, we analyse ACE/SWICS and WIND/3DP data spanning  > 12 years, and test properties of solar wind suprathermal electron distributions for the presence of signatures of the coronal temperature at their origin which may remain at 1 AU. In particular we re-examine a previous suggestion that these properties correlate with the oxygen charge state ratio O7+ ∕ O6+, an established proxy for coronal electron temperature. We find only a very weak but variable correlation between measures of suprathermal electron energy content and O7+ ∕ O6+. The weak nature of the correlation leads us to conclude, in contrast to earlier results, that an initial relationship with core electron temperature has the possibility to exist in the corona, but that in most cases no strong signatures remain in the suprathermal electron distributions at 1 AU. It cannot yet be confirmed whether this is due to the effects of coronal conditions on the establishment of this relationship or due to the altering of the electron distributions by processing during transport in the solar wind en route to 1 AU. Contrasting results for the halo and strahl population favours the latter interpretation. Confirmation of this will be possible using Solar Orbiter data (cruise and nominal mission phase) to test whether the weakness of the relationship persists over a range of heliocentric distances. If the correlation is found to strengthen when closer to the Sun, then this would indicate an initial relationship which is being degraded, perhaps by wave–particle interactions, en route to the observer.

scholarly journals Rock art and the prehistoric landscape of Galicia: the results of field survey 1992–1994

1995 ◽  
Vol 61 ◽  
pp. 347-370 ◽  
Author(s):  
Richard Bradley ◽  
Felipe Criado Boado ◽  
Ramón Fábregas Valcarce
Keyword(s):  
Bronze Age ◽  
Field Survey ◽  
Rock Art ◽  
Outer Edge ◽  
Early Bronze Age ◽  
Copper Age ◽  
North West ◽  
Abrupt Changes ◽  
Ground Conditions ◽  
The Relationship

This paper discusses the relationship between the earlier prehistoric pattern of settlement in Atlantic Europe and the creation of rock art. It investigates the organisation of the Copper Age and Early Bronze Age landscape of north-west Spain using the evidence provided by the distribution, siting, and composition of rock carvings. It presents the results of field survey in three sample areas extending from the centre to the outer edge of their distribution. Although these drawings cannot be interpreted as illustrations of daily life, they may have helped to define rights to particular resources in an area which experienced abrupt changes of ground conditions over the course of the year.

scholarly journals Cluster-C1 observations on the geometrical structure of linear magnetic holes in the solar wind at 1 AU

2010 ◽  
Vol 28 (9) ◽  
pp. 1695-1702 ◽  
Author(s):  
T. Xiao ◽  
Q. Q. Shi ◽  
T. L. Zhang ◽  
S. Y. Fu ◽  
L. Li ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Geometrical Structure ◽  
Occurrence Rate ◽  
Geometrical Shape ◽  
Magnetic Field Data ◽  
Magnetic Field Magnitude ◽  
The Relationship ◽  
Plasma Measurements ◽  
The Magnetic Field

Abstract. Interplanetary linear magnetic holes (LMHs) are structures in which the magnetic field magnitude decreases with little change in the field direction. They are a 10–30% subset of all interplanetary magnetic holes (MHs). Using magnetic field and plasma measurements obtained by Cluster-C1, we surveyed the LMHs in the solar wind at 1 AU. In total 567 interplanetary LMHs are identified from the magnetic field data when Cluster-C1 was in the solar wind from 2001 to 2004. We studied the relationship between the durations and the magnetic field orientations, as well as that of the scales and the field orientations of LMHs in the solar wind. It is found that the geometrical structure of the LMHs in the solar wind at 1 AU is consistent with rotational ellipsoid and the ratio of scales along and across the magnetic field is about 1.93:1. In other words, the structure is elongated along the magnetic field at 1 AU. The occurrence rate of LMHs in the solar wind at 1 AU is about 3.7 per day. It is shown that not only the occurrence rate but also the geometrical shape of interplanetary LMHs has no significant change from 0.72 AU to 1 AU in comparison with previous studies. It is thus inferred that most of interplanetary LMHs observed at 1 AU are formed and fully developed before 0.72 AU. The present results help us to study the formation mechanism of the LMHs in the solar wind.

Verifying the Relationship between Solar Neutrinos and Solar Wind for Solar Cycle 23

2019 ◽  
Vol 4 (1) ◽  
pp. 65-72
Author(s):  
Imad A. H. Al-Hayali ◽  
Wafaa H. A. Zaki ◽  
Shadan S. Salih
Keyword(s):  
Solar Wind ◽  
Solar Cycle ◽  
Solar Neutrinos ◽  
Solar Cycle 23 ◽  
The Relationship

scholarly journals MLT dependence in the relationship between plasmapause, solar wind, and geomagnetic activity based on CRRES: 1990-1991

2016 ◽  
Vol 121 (5) ◽  
pp. 4397-4408 ◽  
Author(s):  
Mario Bandić ◽  
Giuli Verbanac ◽  
Mark B. Moldwin ◽  
Viviane Pierrard ◽  
Giovanni Piredda
Keyword(s):  
Solar Wind ◽  
Geomagnetic Activity ◽  
The Relationship
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