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1999
Coronal mass ejections are seen as bright features that move outward through the solar corona at speeds from 10 to about 2,000 km s-1. They involve the expulsion of substantial quantities of plasma from large regions of the corona. The spectacular nature of the largest mass ejections is illustrated in Figure 5.1 by a time sequence of four images ...
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Coronal mass ejections are seen as bright features that move outward through the solar corona at speeds from 10 to about 2,000 km s-1. They involve the expulsion of substantial quantities of plasma from large regions of the corona. The spectacular nature of the largest mass ejections is illustrated in Figure 5.1 by a time sequence of four images ...
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Coronal mass ejections and interplanetary shocks
Journal of Geophysical Research: Space Physics, 1985A comparison between Solwind observations of coronal mass ejections (CME's) and Helios 1 observations of interplanetary shocks during 1979–1982 indicates that 72% of the shocks were associated with large, low‐latitude mass ejections on the nearby limb.
Sheeley Jr., N. +6 more
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Forces governing coronal mass ejections
Advances in Space Research, 2006Kinematics of CMEs is analyzed to get an insight into the properties of forces partaking in the eruption. It is demonstrated that the Lorentz force plays a dominant role within a distance of a few solar radii. In the distance range 1– 30 solar radii, the inferred values of the Lorentz-force acceleration aL on average decrease with the ...
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Philosophical Transactions of the Royal Society of London. Series A: Physical and Engineering Sciences, 1991
We summarize the observational aspects of the transient solar coronal features known as coronal mass ejections. Recognizing the importance of understanding this form of solar activity, particularly in the light of relations to flare and prominence activity, and geomagnetic effects, we consider the spectrum of models which have been used to describe ...
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We summarize the observational aspects of the transient solar coronal features known as coronal mass ejections. Recognizing the importance of understanding this form of solar activity, particularly in the light of relations to flare and prominence activity, and geomagnetic effects, we consider the spectrum of models which have been used to describe ...
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Advances in Space Research, 1984
Abstract Nearly fifteen years have passed since the discovery of coronal mass ejection events from the solar atmosphere. Progress in the interpretation of the observational results has led to a body of knowledge concerning the geometrical and evolutionary properties, physical characteristics, and the association of this type of event with other forms
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Abstract Nearly fifteen years have passed since the discovery of coronal mass ejection events from the solar atmosphere. Progress in the interpretation of the observational results has led to a body of knowledge concerning the geometrical and evolutionary properties, physical characteristics, and the association of this type of event with other forms
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Coronal Mass Ejections and Magnetic Helicity
2005Coronal mass ejections (CMEs) are the most energetic events in the solar system, expelling up to 1016 g of coronal material at speeds of several hundreds or thousands of km s−1 from the Sun. As CMEs are the primary cause of space weather disturbances, we need to understand their underlying cause(s) in order to be able to predict them. After an overview
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The Sun’s magnetized plasma atmosphere is the source of various forms of activity, the most dramatic of which are coronal mass ejections (CMEs). These ejections are a bulk expulsion of plasma and magnetic field that travel out into the heliosphere, causing space weather effects on any planetary environments that they interact with.
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Initiation of Coronal Mass Ejections
2003Abstract : The over-arching objective of this research was to improve the quantitative basis for prediction of the occurrence of Coronal Mass Ejections (CMEs) and their impact on space weather. The most directly useful discovery, from the point of view of Space Weather forecasting, is that a CME associated with an erupting X-ray sigmoid is more likely ...
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