Killer Electron Hot Spot Found in Earth’s Van Allen Radiation Belts
Multi-point satellite observations by JAXA/Arase and NASA/Van Allen Probes Electrons detected at Van Allen Probes position (left) drift to the Arase position (right) Credit: ERG Science TeamJAXA and NASA satellite observations show where killer electrons are generated in the Van Allen radiation belts surrounding Earth.
A collaboration between researchers in Japan, the USA, and Russia has found a hot spot in Earth’s radiation belt where killer electrons, which can cause serious anomalies in satellites, form. The finding, published in the journal Geophysical Research Letters, could help scientists more accurately forecast when these killer (relativistic) electrons will form.
Professor Yoshizumi Miyoshi of the Institute for Space-Earth Environmental Research at Nagoya University and colleagues compared data from two satellites situated on opposite sides of the Earth: the Arase satellite, developed by the Japanese Aerospace Exploration Agency (JAXA), and NASA’s Van Allen Probes. Both satellites gather data from the Van Allen radiation belts, zones of energetic particles originating largely from solar wind. Energetic particles in the belts are trapped by Earth’s magnetic field.
Scientists have known that electrons in Van Allen radiation belts that interact with ultralow frequency plasma waves accelerate to reach the speed of light. However, it has not been clear when or where these killer electrons start to accelerate.
To gain more insight about the electrons, Professor Miyoshi and his colleagues analyzed data generated on March 30, 2017, by the Arase satellite and Van Allen Probe. On one side of the Earth, the Van Allen Probe identified characteristic signs of an interaction between ultralow frequency waves and energetic electrons. On the opposite side, at the same point in time, the Arase satellite identified high-energy electron signatures, but no ultralow frequency waves.
The measurements indicate that the interaction region between electrons and waves is limited, but that the killer electrons then continue to travel on an eastward path around the Earth’s magnetosphere.
“An important topic in space weather science is understanding the dynamics of killer electrons in the Van Allen radiation belt,” says Miyoshi. “The results of this study will improve the modeling and lead to more accurate forecasting of killer electrons in Van Allen radiation belts.”
Reference: “Remote Detection of Drift Resonance Between Energetic Electrons and Ultralow Frequency Waves: Multisatellite Coordinated Observation by Arase and Van Allen Probes” by M. Teramoto, T. Hori, S. Saito, Y. Miyoshi, S. Kurita, N. Higashio, A. Matsuoka, Y. Kasahara, Y. Kasaba, T. Takashima, R. Nomura, M. Nosé, A. Fujimoto, Y.-M. Tanaka, M. Shoji, Y. Tsugawa, M. Shinohara, I. Shinohara, J. B. Blake, J.F. Fennell, S.G. Claudepierre, D. L. Turner, C. A. Kletzing, D. Sormakov and O. Troshichev, 6 November 2019, Geophysical Research Letters.
- Asteroid 2012 TC4 Will Safely Pass By Earth, Just Above Communications Satellites
- Astronomers View Near-Earth Asteroid 2014 HQ124 as it Passes Earth
- Hubble Space Telescope Views Dwarf Galaxy NGC 178
- Scientists Find Evidence of ‘Orphan’ Gamma-Ray Bursts
- Discovery Provides Clues to How Galaxies and Black Holes Develop Together
- Investigating the Mysterious Pops of Light Spotted by NASA Satellite
- First Data from Ultra-Cold Neutrino Experiment
- Xenon Gas Has Almost Vanished from the Atmosphere
- Puzzling Radiation Bursts Recorded in Tree Rings 1,200 Years Ago
- Changes in the Andes Cause Flood Risks for South American Cities
- Hydrogen Peroxide-Sensing Molecule Helps Select Effective Cancer Therapy
- Supposedly Pure Human Blood Serum Was Tested – Here’s What Researchers Actually Found
- These Fierce Predators Have Incredible Vision and a Newly Discovered Brain Region to Process It
- Guppies Unlock a Key Question About Evolution