NDLI: HF propagation characteristics of artificial ionospheric layers

Content Provider	IEEE Xplore Digital Library
Author	Pedersen, T. Reinisch, B. Paznukhov, V. Hamel, R.
Copyright Year	2011
Description	Author affiliation: Boston College, 140 Commonwealth Avenue, Chestnut Hill, MA 02467 USA (Paznukhov, V.) \|\| Space Vehicles Directorate, Air Force Research Laboratory, 29 Randolph Road, Hanscom AFB, MA 01731 USA (Pedersen, T.) \|\| Lowell Digisonde International, 175 Cabot St, Lowell, MA 01854 USA (Reinisch, B.; Hamel, R.)
Abstract	Artificial ionospheric layers descending from the background F-region ionosphere can be produced by high-power HF transmissions with effective radiated powers of $10^{5}−>10^{6}$ W, especially near harmonics of the electron gyrofrequency. Multiple high-speed DPS-4D ionosondes were utilized to obtain direct and oblique ionospheric soundings from a large number of artificial layers during an experimental campaign at the High Frequency Active Auroral Research Program (HAARP) facility in November 2009. Initial analysis of this data shows remote oblique echoes to be qualitatively similar to direct echoes received at the transmitter site. This pattern holds when the artificial layers are created in different locations including vertical, magnetic zenith, and midway between the two ionosonde sites. Artificial layers can have higher critical frequencies and maximum useable frequencies (MUF) than the background ionosphere when the background is decaying after sunset, and echo amplitudes can be significantly stronger, even when the shorter path lengths are taken into account.
Starting Page	1
Ending Page	4
File Size	1066895
Page Count	4
File Format	PDF
ISBN	9781424451173
e-ISBN	9781424460519
DOI	10.1109/URSIGASS.2011.6051130
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-08-13
Publisher Place	Turkey
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Geometry Transmitters USA Councils Hafnium Production Reflection Ionosphere
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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