NASA Logo, External Link
Facebook icon, External Link to NASA STI page on Facebook Twitter icon, External Link to NASA STI on Twitter YouTube icon, External Link to NASA STI Channel on YouTube RSS icon, External Link to New NASA STI RSS Feed AddThis share icon
 

Record Details

Record 14 of 2176
An Interpretation of Banded Magnetospheric Radio Emissions
Author and Affiliation:
Benson, Robert F.(NASA Goddard Space Flight Center, Greenbelt, MD United States)
Osherovich, V. A.(RITSS, Greenbelt, MD United States)
Fainberg, J.(NASA Goddard Space Flight Center, Greenbelt, MD United States)
Vinas, A. F.(NASA Goddard Space Flight Center, Greenbelt, MD United States)
Ruppert, D. R.(Academy of the Holy Cross, Kensington, MD United States)
Vondrak, Richard R. [Technical Monitor]
Abstract: Recently-published Active Magnetospheric Particle Tracer Explorer/Isothermal Remanent Magnetization (AMPTE/IRM) banded magnetospheric emissions, commonly referred to as '(n + 1/2)f(sub ce)' emissions where f(sub ce) is the electron gyrofrequency, are analyzed by treating them as analogous to sounder-stimulated ionospheric emissions. We show that both individual AMPTE/IRM spectra of magnetospheric banded emissions, and a statistically-derived spectra observed over the two-year lifetime of the mission, can be interpreted in a self-consistent manner. The analysis, which predicts all spectral peaks within 4% of the observed peaks, interprets the higher-frequency emissions as due to low group-velocity Bernstein-mode waves and the lower-frequency emissions as eigen modes of cylindrical-electromagnetic-plasma-oscillations. The demarcation between these two classes of emissions is the electron plasma frequency f(sub pe), where an emission is often observed. This f(sub pe), emission is not necessarily the strongest. None of the observed banded emissions were attributed to the upper-hybrid frequency. We present Alouette-2 and ISIS-1 plasma-resonance data, and model electron temperature (T(sub e)) values, to support the argument that the frequency-spectrum of ionospheric sounder-stimulated emissions is not strongly temperature dependent and thus that the interpretation of these emissions in the ionosphere is relevant to other plasmas (such as the magnetosphere) where N(sub e) and T(sub e) can be quite different but where the ratio f(sub pe)/f(sub ce) is identical.
Publication Date: Jan 01, 2000
Document ID:
20000118225
(Acquired Dec 15, 2000)
Subject Category: COMMUNICATIONS AND RADAR
Document Type: Preprint
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD United States
Description: 3p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: FREQUENCY DISTRIBUTION; PLASMA FREQUENCIES; PLASMA OSCILLATIONS; RADIO EMISSION; AMPTE (SATELLITES); STIMULATED EMISSION; GYROFREQUENCY; EARTH MAGNETOSPHERE
Availability Source: Other Sources
Availability Notes: Abstract Only
› Back to Top
Find Similar Records
NASA Logo, External Link
NASA Official: Gerald Steeman
Site Curator: STI Program
Last Modified: August 22, 2011
Contact Us