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Articles by Ryan Dewey
Dynamic electron radiation belt at Mercury controlled by solar wind driving
Abstract Electron radiation belts, reservoirs of stably trapped energetic electrons hazardous to space technology, are a prevalent feature of most magnetized planetary environments. However, their existence in the compact magnetosphere of Mercury has been a subject of debate for decades. The presence of energetic electrons was first identified by Mariner 10’s observations in the 1970s but was subsequently questioned by MESSENGER’s limited energetic particle measurements 40 years later.
Multi-source connectivity as the driver of solar wind variability in the heliosphere - Nature Astronomy
Abstract The ambient solar wind that fills the heliosphere originates from multiple sources in the solar corona and is highly structured. It is often described as high-speed, relatively homogeneous, plasma streams from coronal holes and slow-speed, highly variable, streams whose source regions are under debate. A key goal of ESA/NASA’s Solar Orbiter mission is to identify solar wind sources and understand what drives the complexity seen in the heliosphere.
A transient enhancement of Mercury’s exosphere at extremely high altitudes inferred from pickup ions
Abstract Mercury has a global dayside exosphere, with measured densities of 10−2 cm−3 at ~1500 km. Here we report on the inferred enhancement of neutral densities (<102 cm−3) at high altitudes (~5300 km) by the MESSENGER spacecraft. Such high-altitude densities cannot be accounted for by the typical exosphere. This event was observed by the Fast-Imaging Plasma Spectrometer (FIPS), which detected heavy ions of planetary origin that were recently ionized, and “picked up” by the solar wind.
LETTERS: Pot shouldn’t be legal
Editor: Growing up in the ‘80s and ‘90s, I witnessed many of my peers using (marijuana). Often as a way to rebel against parents, teachers, and other authority figures of the day, while at the same time pushing the boundaries of what was socially acceptable. A couple of friends of mine tried it casually in high school, but that wasn’t enough so they then smoked it regularly. But then that wasn’t enough so they had to move on to something harder, such as cocaine or heroin.
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