Trends in critical frequencies and layer heights over Tromso and their consequential impact for radio system modelling

P S Cannon, N C Rogers, C M Hall

Research output: Chapter in Book/Report/Conference proceedingChapter

7 Citations (Scopus)

Abstract

A unique resource providing continuous observations of the critical frequencies since 1935 and layer heights since 1952 has been used to determine the long-term trends above Tromso in Northern Norway (69degreesN, 19degreesE). These, and the recent results of Ulich et al. [Ulich, T., Cliverd, M.A., Rishbeth, H. Determining the long-term change in the ionosphere. EOS Trans. 84(52), 581-585, 2003] have then been used to illustrate the effects of layer height changes on radio system modelling and operation by reference to high frequency ground range and skip zone variations. The analysis ignores the effects of the variations in the underlying E-region and changes in the F2 layer critical frequencies. Consequently, the system impact is expected to be higher still. It is shown that a 16 kin drop in h(m)F2 will introduce ground errors of similar to100 km with higher values under certain circumstances. The Tromso analysis indicate that these ground range errors will not occur until the year 2110, however, the results of Ulich et al. [EOS Trans. 84(52), 581-585, 2003] indicate that this condition occurred in the year 2000. This study demonstrates an urgent need to reach a consensus understanding of long-term ionospheric trends. A reassessment of the CCIR and URSI worldwide maps of ionospheric characteristics is likely necessary. (C) 2004 QinetiQ. Published by Elsevier Ltd. All rights reserved.
Original languageEnglish
Title of host publicationIri: Quantifying Ionospheric Variability
Pages2085-2091
Number of pages7
Volume34
DOIs
Publication statusPublished - 2004

Publication series

NameAdvances in Space Research-Series

Fingerprint

EOS
radio
modeling
E region
long-term change
ionosphere
resource
trend
analysis
effect
long-term trend

Cite this

Cannon, P. S., Rogers, N. C., & Hall, C. M. (2004). Trends in critical frequencies and layer heights over Tromso and their consequential impact for radio system modelling. In Iri: Quantifying Ionospheric Variability (Vol. 34, pp. 2085-2091). (Advances in Space Research-Series). https://doi.org/10.1016/j.asr.2004.03.018

Trends in critical frequencies and layer heights over Tromso and their consequential impact for radio system modelling. / Cannon, P S; Rogers, N C; Hall, C M.

Iri: Quantifying Ionospheric Variability. Vol. 34 2004. p. 2085-2091 (Advances in Space Research-Series).

Research output: Chapter in Book/Report/Conference proceedingChapter

Cannon, PS, Rogers, NC & Hall, CM 2004, Trends in critical frequencies and layer heights over Tromso and their consequential impact for radio system modelling. in Iri: Quantifying Ionospheric Variability. vol. 34, Advances in Space Research-Series, pp. 2085-2091. https://doi.org/10.1016/j.asr.2004.03.018
Cannon PS, Rogers NC, Hall CM. Trends in critical frequencies and layer heights over Tromso and their consequential impact for radio system modelling. In Iri: Quantifying Ionospheric Variability. Vol. 34. 2004. p. 2085-2091. (Advances in Space Research-Series). https://doi.org/10.1016/j.asr.2004.03.018
Cannon, P S ; Rogers, N C ; Hall, C M. / Trends in critical frequencies and layer heights over Tromso and their consequential impact for radio system modelling. Iri: Quantifying Ionospheric Variability. Vol. 34 2004. pp. 2085-2091 (Advances in Space Research-Series).
@inbook{af1ba3572a5545b5aa3765cb331c966d,
title = "Trends in critical frequencies and layer heights over Tromso and their consequential impact for radio system modelling",
abstract = "A unique resource providing continuous observations of the critical frequencies since 1935 and layer heights since 1952 has been used to determine the long-term trends above Tromso in Northern Norway (69degreesN, 19degreesE). These, and the recent results of Ulich et al. [Ulich, T., Cliverd, M.A., Rishbeth, H. Determining the long-term change in the ionosphere. EOS Trans. 84(52), 581-585, 2003] have then been used to illustrate the effects of layer height changes on radio system modelling and operation by reference to high frequency ground range and skip zone variations. The analysis ignores the effects of the variations in the underlying E-region and changes in the F2 layer critical frequencies. Consequently, the system impact is expected to be higher still. It is shown that a 16 kin drop in h(m)F2 will introduce ground errors of similar to100 km with higher values under certain circumstances. The Tromso analysis indicate that these ground range errors will not occur until the year 2110, however, the results of Ulich et al. [EOS Trans. 84(52), 581-585, 2003] indicate that this condition occurred in the year 2000. This study demonstrates an urgent need to reach a consensus understanding of long-term ionospheric trends. A reassessment of the CCIR and URSI worldwide maps of ionospheric characteristics is likely necessary. (C) 2004 QinetiQ. Published by Elsevier Ltd. All rights reserved.",
author = "Cannon, {P S} and Rogers, {N C} and Hall, {C M}",
note = "ID number: ISI:000226373800034",
year = "2004",
doi = "10.1016/j.asr.2004.03.018",
language = "English",
isbn = "0273-1177",
volume = "34",
series = "Advances in Space Research-Series",
pages = "2085--2091",
booktitle = "Iri: Quantifying Ionospheric Variability",

}

TY - CHAP

T1 - Trends in critical frequencies and layer heights over Tromso and their consequential impact for radio system modelling

AU - Cannon, P S

AU - Rogers, N C

AU - Hall, C M

N1 - ID number: ISI:000226373800034

PY - 2004

Y1 - 2004

N2 - A unique resource providing continuous observations of the critical frequencies since 1935 and layer heights since 1952 has been used to determine the long-term trends above Tromso in Northern Norway (69degreesN, 19degreesE). These, and the recent results of Ulich et al. [Ulich, T., Cliverd, M.A., Rishbeth, H. Determining the long-term change in the ionosphere. EOS Trans. 84(52), 581-585, 2003] have then been used to illustrate the effects of layer height changes on radio system modelling and operation by reference to high frequency ground range and skip zone variations. The analysis ignores the effects of the variations in the underlying E-region and changes in the F2 layer critical frequencies. Consequently, the system impact is expected to be higher still. It is shown that a 16 kin drop in h(m)F2 will introduce ground errors of similar to100 km with higher values under certain circumstances. The Tromso analysis indicate that these ground range errors will not occur until the year 2110, however, the results of Ulich et al. [EOS Trans. 84(52), 581-585, 2003] indicate that this condition occurred in the year 2000. This study demonstrates an urgent need to reach a consensus understanding of long-term ionospheric trends. A reassessment of the CCIR and URSI worldwide maps of ionospheric characteristics is likely necessary. (C) 2004 QinetiQ. Published by Elsevier Ltd. All rights reserved.

AB - A unique resource providing continuous observations of the critical frequencies since 1935 and layer heights since 1952 has been used to determine the long-term trends above Tromso in Northern Norway (69degreesN, 19degreesE). These, and the recent results of Ulich et al. [Ulich, T., Cliverd, M.A., Rishbeth, H. Determining the long-term change in the ionosphere. EOS Trans. 84(52), 581-585, 2003] have then been used to illustrate the effects of layer height changes on radio system modelling and operation by reference to high frequency ground range and skip zone variations. The analysis ignores the effects of the variations in the underlying E-region and changes in the F2 layer critical frequencies. Consequently, the system impact is expected to be higher still. It is shown that a 16 kin drop in h(m)F2 will introduce ground errors of similar to100 km with higher values under certain circumstances. The Tromso analysis indicate that these ground range errors will not occur until the year 2110, however, the results of Ulich et al. [EOS Trans. 84(52), 581-585, 2003] indicate that this condition occurred in the year 2000. This study demonstrates an urgent need to reach a consensus understanding of long-term ionospheric trends. A reassessment of the CCIR and URSI worldwide maps of ionospheric characteristics is likely necessary. (C) 2004 QinetiQ. Published by Elsevier Ltd. All rights reserved.

U2 - 10.1016/j.asr.2004.03.018

DO - 10.1016/j.asr.2004.03.018

M3 - Chapter

SN - 0273-1177

VL - 34

T3 - Advances in Space Research-Series

SP - 2085

EP - 2091

BT - Iri: Quantifying Ionospheric Variability

ER -