Switchbacks Explained: Super-Parker Fields—The Other Side of the Sub-Parker Spiral

Suprathermal electron evolution in a Parker spiral magnetic field

[1] Suprathermal electrons (>70 eV) form a small fraction of the total solar wind electron density but serve as valuable tracers of heliospheric magnetic field topology. Their usefulness as tracers of magnetic loops with both feet rooted on the Sun, however, most likely fades as the loops expand beyond some distance owing to scattering. As a first step toward quantifying that distance, we const...

THE PERSIANS. LOST CIVILIZATIONS Geoffrey Parker and Brenda Parker, Reaktion Book, 2017, 208 pages

Discussion - Ron Parker

One of the main points of the paper is the importance of addressing conflicts of interest in a way that will not reduce the information flow to financial markets. While a number of remedies are already in place, putting the bubble and fraud into a somewhat broader perspective, in order to avoid further remedies that might do more harm than good, could be worthwhile. Although one would not want ...

Parker weights revisited.

The short-scan case in fan-beam computed tomography requires the introduction of a weighting function to handle redundant data. Parker introduced such a weighting function for a scan over pi plus the opening angle of the fan. In this article we derive a general class of weighting functions for arbitrary scan angles between pi plus fan angle and 2pi (over-scan). These weighting functions lead to...

Geoff A. Parker

helping to create a low-carbon economy”. While companies now scramble to assemble their green credentials, Wal-Mart are already raising the stakes, with Leo Scott addressing a meeting in the UK this month at the invitation of Prince Charles. He promised to take nonrenewable energy “off our shelves and out of the lives of our customers”. “Forgive the jargon, but we think sustainability is cool,”...