skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Measurements of transionospheric radio propagation parameters using the FORTE satellite

Abstract

We report initial measurements of ionospheric propagation parameters, particularly the total electron content (TEC), using the recently launched FORTE satellite. FORTE, which orbits the Earth at an altitude of 800 km and an inclination of 70{degree}, contains a set of wideband radio receivers whose output is digitally recorded. A specialized triggering circuit identifies transient, broadband radio events, which include radiation from lightning, transionospheric pulse pairs, and man-made sources. Event data are transmitted to the ground station for analysis. In this paper we examine signals transmitted from an electromagnetic pulse generator operated at Los Alamos. The transmitter produces nearly impulsive signals in the VHF range. The received signal is dispersed by the ionosphere, and the received signal can be analyzed to deduce the total electron content along the path. By comparing the slant TEC thus measured with results from a ray-tracing code, we can deduce the vertical TEC to 800 km. Data from eight passes are presented. These types of data (in larger quantities) are of interest to operators of radar altimeters, who need data to corroborate their corrections for the ionospheric TEC. The combination of FORTE TEC data to 800 km and TEC measurements to 20,000 km (the Global Positioningmore » System orbital altitude) can provide useful information for assessing the validity of models of plasmaspheric electron density. Initial estimates of the plasmaspheric density, on two daytime passes, are about 6 TECU. The signal received by FORTE, which is linearly polarized at the transmitter, is split into two magnetoionic modes by the ionosphere. The receiving antenna is also linearly polarized and therefore receives both modes. By measuring the beat frequency between the two modes, we can deduce the product of the geomagnetic field and the cosine of the angle between the field and the propagation vector. The possibility of using the measured slant TEC and the beat frequency to geolocate impulsive signals is discussed. {copyright} 1998 American Geophysical Union« less

Authors:
; ;
Publication Date:
OSTI Identifier:
678826
Resource Type:
Journal Article
Journal Name:
Radio Science
Additional Journal Information:
Journal Volume: 33; Journal Issue: 6; Other Information: PBD: Nov 1998
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; IONOSPHERE; WAVE PROPAGATION; ELECTRON DENSITY; SPACE VEHICLES; DATA ANALYSIS; TIME-SERIES ANALYSIS; TRANSFER FUNCTIONS

Citation Formats

Massey, Robert S, Knox, Stephen O, Holden, Daniel N, and Rhodes, Charley T. Measurements of transionospheric radio propagation parameters using the FORTE satellite. United States: N. p., 1998. Web. doi:10.1029/98RS02032.
Massey, Robert S, Knox, Stephen O, Holden, Daniel N, & Rhodes, Charley T. Measurements of transionospheric radio propagation parameters using the FORTE satellite. United States. https://doi.org/10.1029/98RS02032
Massey, Robert S, Knox, Stephen O, Holden, Daniel N, and Rhodes, Charley T. 1998. "Measurements of transionospheric radio propagation parameters using the FORTE satellite". United States. https://doi.org/10.1029/98RS02032.
@article{osti_678826,
title = {Measurements of transionospheric radio propagation parameters using the FORTE satellite},
author = {Massey, Robert S and Knox, Stephen O and Holden, Daniel N and Rhodes, Charley T.},
abstractNote = {We report initial measurements of ionospheric propagation parameters, particularly the total electron content (TEC), using the recently launched FORTE satellite. FORTE, which orbits the Earth at an altitude of 800 km and an inclination of 70{degree}, contains a set of wideband radio receivers whose output is digitally recorded. A specialized triggering circuit identifies transient, broadband radio events, which include radiation from lightning, transionospheric pulse pairs, and man-made sources. Event data are transmitted to the ground station for analysis. In this paper we examine signals transmitted from an electromagnetic pulse generator operated at Los Alamos. The transmitter produces nearly impulsive signals in the VHF range. The received signal is dispersed by the ionosphere, and the received signal can be analyzed to deduce the total electron content along the path. By comparing the slant TEC thus measured with results from a ray-tracing code, we can deduce the vertical TEC to 800 km. Data from eight passes are presented. These types of data (in larger quantities) are of interest to operators of radar altimeters, who need data to corroborate their corrections for the ionospheric TEC. The combination of FORTE TEC data to 800 km and TEC measurements to 20,000 km (the Global Positioning System orbital altitude) can provide useful information for assessing the validity of models of plasmaspheric electron density. Initial estimates of the plasmaspheric density, on two daytime passes, are about 6 TECU. The signal received by FORTE, which is linearly polarized at the transmitter, is split into two magnetoionic modes by the ionosphere. The receiving antenna is also linearly polarized and therefore receives both modes. By measuring the beat frequency between the two modes, we can deduce the product of the geomagnetic field and the cosine of the angle between the field and the propagation vector. The possibility of using the measured slant TEC and the beat frequency to geolocate impulsive signals is discussed. {copyright} 1998 American Geophysical Union},
doi = {10.1029/98RS02032},
url = {https://www.osti.gov/biblio/678826}, journal = {Radio Science},
number = 6,
volume = 33,
place = {United States},
year = {1998},
month = {11}
}