ORCID Profile
0000-0002-6011-016X
Current Organisations
University of Adelaide
,
Defence Science and Technology Group
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Publisher: American Geophysical Union (AGU)
Date: 02-2014
DOI: 10.1002/2013RS005274
Publisher: Copernicus GmbH
Date: 21-12-2006
DOI: 10.5194/ANGEO-24-3329-2006
Abstract: Abstract. In this paper we investigate the spatial and temporal distribution of ionospheric irregularities in the South-East Asian longitude sector by analysing the scintillation of GPS signals received at ground based stations. The data used for this work were collected during 1998 to 2002 with our regional network of GPS based scintillation monitors (Thomas et al., 2001). The aim of this analysis is to better understand the morphology and climatology of ionospheric irregularities in our region. Interesting differences between the north and south anomalies are noted when we examine the latitudinal–temporal variation of irregularity activity. We investigate the possible causes of these differences and note that variations in the irregularity seeding mechanism and in the background ionosphere at the two anomalies could be important. Phase screen diffraction theory is used to analyse our scintillation data and we note problems with this theory for ray-paths with large off-zenith angles. The height of the phase screen is another important issue. We discuss the implications for models which rely on phase screen diffraction theory.
Publisher: MDPI AG
Date: 29-04-2022
DOI: 10.3390/RS14092139
Abstract: An understanding of land and sea surface backscatter coefficients at high frequencies (HF) is required to accurately assess ionospheric propagation conditions for over-the-horizon radar. In this paper, two methods of calculating sea surface backscatter coefficients are compared. The first method is a theoretical method developed by Barrick in 1972, which treats the sea as a slightly rough surface defined by a wave height spectrum and uses a perturbation approach. The second method compares the difference between observed and modelled backscatter ionograms in which all other losses are accounted for to obtain a measurement of the sea surface backscatter coefficient. Similar trends and values for the sea surface backscatter coefficients from each method were found despite the many models and assumptions required for both these methods. However, it was noted that there was a larger range of values for the sea surface backscatter coefficients when the Barrick method was used.
Publisher: American Geophysical Union (AGU)
Date: 10-2004
DOI: 10.1029/2003RS003014
Publisher: IEEE
Date: 05-2017
Publisher: Springer Science and Business Media LLC
Date: 1995
DOI: 10.1007/BF00671514
Publisher: American Geophysical Union (AGU)
Date: 09-2018
DOI: 10.1029/2018RS006613
Publisher: American Geophysical Union (AGU)
Date: 06-2012
DOI: 10.1029/2011JA017438
Publisher: American Geophysical Union (AGU)
Date: 11-2001
DOI: 10.1029/2000RS002520
Publisher: American Geophysical Union (AGU)
Date: 2014
DOI: 10.1002/2013JA019247
Publisher: IEEE
Date: 08-2017
Publisher: IEEE
Date: 08-2017
Publisher: American Geophysical Union (AGU)
Date: 11-2004
DOI: 10.1029/2004JA010450
Publisher: American Geophysical Union (AGU)
Date: 11-1996
DOI: 10.1029/96RS02028
Publisher: American Geophysical Union (AGU)
Date: 2016
DOI: 10.1002/2015RS005842
Publisher: American Geophysical Union (AGU)
Date: 07-1995
DOI: 10.1029/95RS00644
Publisher: American Geophysical Union (AGU)
Date: 03-1997
DOI: 10.1029/96RS03638
Publisher: IEEE
Date: 08-2017
Publisher: Wiley
Date: 24-03-2021
Publisher: MDPI AG
Date: 02-11-2022
DOI: 10.3390/RS14215514
Abstract: Over the horizon radars (OTHR) rely on the propagation of high frequency (HF) radio waves via the ionosphere to successfully achieve their designated missions. Backscatter sounders (BSS) are environmental over-the-horizon radars which may be used to assess the ionospheric propagation conditions. However, high power observed by a BSS may be due to either good ionospheric propagation, a high surface backscatter coefficient, or a combination of both. Hence, an understanding of the surface backscatter coefficients and their temporal variation is essential to fully understand the ionospheric propagation conditions. A database of surface backscatter coefficients over a decade was created using backscatter ionogram data from four backscatter sounders in Australia. The temporal variations in the backscatter coefficients were investigated and it was found that the land backscatter coefficients were relatively constant over time, while the sea backscatter coefficients showed significant seasonal variation.
Publisher: Elsevier BV
Date: 06-2004
Publisher: Elsevier BV
Date: 11-2019
Publisher: American Geophysical Union (AGU)
Date: 09-2004
DOI: 10.1029/2004GL020581
Publisher: American Geophysical Union (AGU)
Date: 09-2018
DOI: 10.1029/2018RS006607
Publisher: American Geophysical Union (AGU)
Date: 12-2017
DOI: 10.1002/2017JA024337
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2022
Publisher: American Geophysical Union (AGU)
Date: 02-2016
DOI: 10.1002/2015RS005856
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2017
Publisher: Oxford University Press (OUP)
Date: 15-09-1994
Publisher: American Geophysical Union (AGU)
Date: 12-2017
DOI: 10.1002/2017RS006280
Publisher: American Geophysical Union (AGU)
Date: 05-2000
DOI: 10.1029/1999RS002226
No related grants have been discovered for Manuel Cervera.