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Electric Current Circuits in Astrophysics

Frey, Harald U.; Fletcher, Lyndsay; Kuijpers, Jan

Cosmic magnetic structures have in common that they are anchored in a dynamo, that an external driver converts kinetic energy into internal magnetic energy, that this magnetic energy is transported as Poynting flux across the magnetically dominated structure, and that the magnetic energy is released in the form of particle acceleration, heating, b…

Sources of Local Time Asymmetries in Magnetodiscs

Jackman, C. M.; Khurana, K. K.; Kane, M. +2 more

The rapidly rotating magnetospheres at Jupiter and Saturn contain a near-equatorial thin current sheet over most local times known as the magnetodisc, resembling a wrapped-up magnetotail. The Pioneer, Voyager, Ulysses, Galileo, Cassini and New Horizons spacecraft at Jupiter and Saturn have provided extensive datasets from which to observationally …

The Subsurface Structure and Density of Cometary Nuclei

Lamy, P. L.; Toth, I.; Herique, A.

Little is known about the internal structure and density of cometary nuclei. Indirect evidences available so far are not compelling and these questions essentially remain a matter of speculation. It is therefore important to fully exploit the potential sources of information and this is particularly the case of radar observations which have the ca…

The Importance of Long-Term Synoptic Observations and Data Sets for Solar Physics and Helioseismology

Gosain, Sanjay; Broomhall, Anne-Marie; Elsworth, Yvonne +3 more

A casual single glance at the Sun would not lead an observer to conclude that it varies. The discovery of the 11-year sunspot cycle was only made possible through systematic daily observations of the Sun over 150 years and even today historic sunspot drawings are used to study the behavior of past solar cycles. The origin of solar activity is stil…

Multi-scale Structure Formation and Dynamics in Cosmic Plasmas

Balogh, A.; Eastwood, J.; Kaastra, J. +1 more