Featured Research

from universities, journals, and other organizations

Waves In Earth's Radiation Belt Get Mapped

Date:
May 31, 2009
Source:
American Geophysical Union
Summary:
Chorus waves, a type of electromagnetic emission generated by electrons in Earth's radiation belt, play an important role in both accelerating and removing the energetic radiation belt electrons that can disrupt satellite electronics and disturb communications with ground-based operators.

Chorus waves, a type of electromagnetic emission generated by electrons in Earth's radiation belt, play an important role in both accelerating and removing the energetic radiation belt electrons that can disrupt satellite electronics and disturb communications with ground-based operators.

To improve understanding of the origin and location of chorus waves, a team of researchers used data from NASA's five Time History of Events and Macroscale Interactions during Substorms (THEMIS) satellites to create a new map of their distribution. They reported their findings in a recent issue of Geophysical Research Letters.

The authors (Li et al.) found, in agreement with previous studies, that nightside chorus occurs only near the equator, whereas dayside chorus extends to higher latitudes.

In addition, they observed that amplitudes of chorus waves depend strongly on geomagnetic activity. The most important new finding, the authors note, is that at a distance of more than 7 Earth radii (about 45,000 kilometers) on Earth's dayside, moderate chorus is present more than 10 percent of the time (a much higher occurrence rate than on the nightside) and persists even during periods of low geomagnetic activity. The authors believe that the new information could provide additional clues about the origin of dayside and nightside chorus waves.

The team included scientists from the University of California, Los Angeles, the Swedish Institute of Space Physics, the Centre d'étude des Environnements Terrestre et Planétaires in France, Technischen Universität Braunschweig in Germany, and the Austrian Academy of Sciences.


Story Source:

The above story is based on materials provided by American Geophysical Union. Note: Materials may be edited for content and length.


Journal Reference:

  1. Li, W., R. M. Thorne, V. Angelopoulos, J. Bortnik, C. M. Cully, B. Ni, O. LeContel, A. Roux, U. Auster, and W. Magnes. Global distribution of whistler-mode chorus waves observed on the THEMIS spacecraft. Geophysical Research Letters, 2009; 36 (9): L09104 DOI: 10.1029/2009GL037595

Cite This Page:

American Geophysical Union. "Waves In Earth's Radiation Belt Get Mapped." ScienceDaily. ScienceDaily, 31 May 2009. <www.sciencedaily.com/releases/2009/05/090529135759.htm>.
American Geophysical Union. (2009, May 31). Waves In Earth's Radiation Belt Get Mapped. ScienceDaily. Retrieved September 2, 2014 from www.sciencedaily.com/releases/2009/05/090529135759.htm
American Geophysical Union. "Waves In Earth's Radiation Belt Get Mapped." ScienceDaily. www.sciencedaily.com/releases/2009/05/090529135759.htm (accessed September 2, 2014).

Share This




More Earth & Climate News

Tuesday, September 2, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Sharks Off the Menu and on the Tourist Trail in Palau

Sharks Off the Menu and on the Tourist Trail in Palau

AFP (Sep. 2, 2014) — Tourists in Palau clamour to dive with sharks thanks to a pioneering conservation initiative -- as the island nation plans to completely ban commercial fishing in its vast ocean territory. 01:15 Video provided by AFP
Powered by NewsLook.com
Iceland Lowers Aviation Alert on Volcano

Iceland Lowers Aviation Alert on Volcano

AFP (Sep. 1, 2014) — Iceland has lowered its aviation alert on its largest volcano after a fresh eruption on a nearby lava field prompted authorities to enforce a flight ban for several hours. Duration: 01:07 Video provided by AFP
Powered by NewsLook.com
Lightning Hurts 3 on NYC Beach

Lightning Hurts 3 on NYC Beach

AP (Sep. 1, 2014) — A lightning strike injured three people on a New York City beach on Sunday. The storms also delayed flights and interrupted play at the US Open tennis tournament. (Sept. 1) Video provided by AP
Powered by NewsLook.com
Thailand Totters Towards Waste Crisis

Thailand Totters Towards Waste Crisis

AFP (Sep. 1, 2014) — Fears are mounting in Bangkok that poor planning and lax law enforcement are tipping Thailand towards a waste crisis. Duration: 01:21 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins