ORCID Profile
0000-0003-2918-1709
Current Organisation
University of South Australia
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Publisher: Elsevier BV
Date: 06-2015
Publisher: Oxford University Press (OUP)
Date: 09-2009
Publisher: American Geophysical Union (AGU)
Date: 22-08-2014
DOI: 10.1002/2014JD021787
Publisher: American Geophysical Union (AGU)
Date: 12-01-2018
DOI: 10.1002/2017GL076282
Publisher: Copernicus GmbH
Date: 18-04-2017
DOI: 10.5194/ANGEO-35-567-2017
Abstract: Abstract. We consider 5 years of spectrometer measurements of OH(6–2) and O2(0–1) airglow emission intensities and temperatures made near Adelaide, Australia (35° S, 138° E), between September 2001 and August 2006 and compare them with measurements of the same parameters from at the same site using an airglow imager, with the intensities of the OH(8–3) and O(1S) emissions made with a filter photometer, and with 2 years of Aura MLS (Microwave Limb Sounder) v3.3 temperatures and 4.5 years of TIMED SABER (Thermosphere Ionosphere Mesosphere Energetics and Dynamics Sounding of the Atmosphere using Broadband Emission Radiometry) v2.0 temperatures for the same site. We also consider whether we can recover the actual emission heights from the intercomparison of the ground-based and satellite observations. We find a significant improvement in the correlation between the spectrometer OH and SABER temperatures by interpolating the latter to constant density surfaces determined using a meteor radar.
Publisher: American Geophysical Union (AGU)
Date: 07-11-2019
DOI: 10.1029/2019JD030735
Publisher: Copernicus GmbH
Date: 25-01-2021
DOI: 10.5194/AMT-2021-14
Abstract: Abstract. A 31 MHz meteor radar located in Svalbard has been used to observe polar mesospheric echoes (PMSE) during summer 2020. Data from 19 July was selected for detailed analysis, with a focus on extracting additional information to characterize the atmosphere in the PMSE region. The use of an all-sky meteor radar adds an additional use to data collected for meteor observations and enables the detection of PMSE layers across a wide field of view. Comparison with data from a 53.5 MHz narrow-beam MST radar shows good agreement in the morphology of the layer as detected between the two systems. Doppler spectra of PMSE layers reveal fine structure, including regions of enhanced return that move across the radar's field of view. The relationship between range and Doppler shift of off-zenith portions of the layer enable the estimation of wind speeds with high temporal resolution during PMSE conditions. Trials demonstrate good agreement between wind speeds obtained from PMSE Doppler spectra and those calculated from specular meteor trail radial velocities. Combined with the antenna polar diagram of the radar, this same relationship was used to infer the aspect sensitivity of observed PMSE backscatter, yielding a mean backscatter angular width of 6.6 ± 2.8°. A comparison of underdense meteor radar echo decay times during and outside of PMSE conditions did not demonstrate a strong correlation between the presence of PMSE and shortened underdense meteor radar echo durations.
Publisher: American Geophysical Union (AGU)
Date: 03-2013
DOI: 10.1002/RDS.20026
Publisher: American Geophysical Union (AGU)
Date: 08-2008
DOI: 10.1029/2008GL033763
Publisher: American Geophysical Union (AGU)
Date: 11-04-2013
DOI: 10.1002/JGRD.50315
Publisher: American Chemical Society (ACS)
Date: 03-2018
Publisher: Copernicus GmbH
Date: 05-03-2013
DOI: 10.5194/ANGEO-31-409-2013
Abstract: Abstract. A mesospheric bore event was observed using an OH all-sky airglow imager (ASAI) at Xinglong (40.2° N, 117.4° E), in northern China, on the night of 8–9 January 2011. Simultaneous observations by a Doppler meteor radar, a broadband sodium lidar, and TIMED/SABER OH intensity and temperature measurements are used to investigate the characteristics and environment of the bore propagation and the possible relations with the Na density perturbations. The bore propagated from northeast to southwest and ided the sky into bright and dark halves. The calculations show that the bore has an average phase velocity of 68 m s−1. The crests following the bore have a horizontal wavelength of ~ 22 km. These parameters are consistent with the hydraulic jump theory proposed by Dewan and Picard, as well as the previous bore reports. Simultaneous wind measurements from the Doppler meteor radar at Shisanling (40.3° N, 116.2° E) and temperature data from SABER on board the TIMED satellite are used to characterize the propagating environment of the bore. The result shows that a thermal-Doppler duct exists near the OH layer that supports the horizontal propagation of the bore. Simultaneous Na lidar observations at Yanqing (40.4° N, 116.0° E) suggest that there is a downward displacement of Na density during the passage of the mesospheric bore event.
Publisher: American Geophysical Union (AGU)
Date: 07-2010
DOI: 10.1029/2010GL044086
Publisher: American Geophysical Union (AGU)
Date: 09-2017
DOI: 10.1002/2017RS006284
Publisher: American Geophysical Union (AGU)
Date: 08-2017
DOI: 10.1002/2017JA024446
Publisher: Elsevier BV
Date: 10-2014
Publisher: American Geophysical Union (AGU)
Date: 26-08-2017
DOI: 10.1002/2017GL074813
Publisher: Wiley
Date: 04-2018
DOI: 10.1002/2017JA025059
Publisher: American Geophysical Union (AGU)
Date: 07-10-2014
DOI: 10.1002/2014GL061478
Publisher: Oxford University Press (OUP)
Date: 30-07-2012
Publisher: Copernicus GmbH
Date: 21-07-2021
Abstract: Abstract. A 31 MHz meteor radar located in Svalbard was used to observe polar mesospheric echoes (PMSEs) during summer 2020. Data from 19 July were selected for detailed analysis, with a focus on extracting additional information to characterize the atmosphere in the PMSE region. The use of an all-sky meteor radar adds an additional use to data collected for meteor observations and enables the detection of PMSE layers across a wide field of view. Comparison with data from a 53.5 MHz narrow-beam mesosphere–stratosphere–troposphere (MST) radar shows good agreement in the morphology of the layer as detected between the two systems. Doppler spectra of PMSE layers reveal fine structure, including regions of enhanced return that move across the radar's field of view. Examination of the relationship between range and Doppler shift of off-zenith portions of the layer enables the estimation of wind speeds with high temporal resolution during PMSE conditions. Trials demonstrate good agreement between wind speeds obtained from PMSE Doppler spectra and those calculated from specular meteor trail radial velocities. Combined with the antenna polar diagram of the radar, this same relationship was used to infer the aspect sensitivity of observed PMSE backscatter, yielding a mean backscatter angular width of 6.8±3.3∘. A comparison of underdense meteor radar echo decay times during and outside of PMSE conditions did not demonstrate a strong correlation between the presence of PMSEs and shortened underdense meteor radar echo durations.
Publisher: American Geophysical Union (AGU)
Date: 24-07-2015
DOI: 10.1002/2015GL065066
No related grants have been discovered for Joel Younger.