Variability of virtual layered phenomena in the mesosphere observed with medium frequency radars at 69°N

Renkwitz, Toralf; Latteck, R.

doi:10.1016/j.jastp.2017.05.009

Cited by 14 publications

(12 citation statements)

References 26 publications

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“…Besides the parts originating from the desired measuring volume (beam pointing direction) additional scatter collected via the radiation pattern side lobes is frequently detected. Renkwitz et al (2018) have shown, that a certain angular spread of ±2 • around the nominal positions is generally occurring, which corresponds to the radiation pattern beam shape and width. Any additional scatter, especially picked up via the side lobes will enlarge the spectral width of the received signal as for the same horizontal wind velocity e.g.…”

Section: Spectral Width Analysis Of Radar Datamentioning

confidence: 89%

“…For the altitudes of 60 to 80 km the wind results of both methods are widely consistent. Renkwitz et al (2018) demonstrated the beneficial combination of both methods to maximize the coverage and to derive more reliable estimates especially for the upper altitudes. As for the PMWE1 campaign altitudes below 80 km are investigated, the combination of both methods did not exhibit any improvement and we therefore remain with DBS including the statistically corrected scattering position.…”

Section: Saura Mf Radar: Experiments Configuration Data Analysis and mentioning

confidence: 99%

“…Interferometric analysis of the scattering structures, like the dominant scattering position, were possible as in total eight antennas are connected to individual receivers. This capability was used to verify the beam pointing directions as well as to derive the effective scattering positions to improve the reliability of the wind estimations (see Renkwitz et al, 2018).…”

Section: Saura Mf Radar: Experiments Configuration Data Analysis and mentioning

confidence: 99%

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D region observations by VHF and HF radars during a rocket campaign at Andøya dedicated to investigations of PMWE

2019

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Abstract. In April 2018 the PMWE1 sounding rocket campaign was conducted at the Andøya Space Center involving coordinated measurements with rockets and ground instruments to measure parameters relevant for testing of the existing theories of polar mesospheric winter echo (PMWE) formation. The Middle Atmosphere Alomar Radar System (MAARSY) was operated to detect PMWE with multiple beam directions to detect favorable launch conditions. A dedicated experiment configuration with five different beam positions was used to point the radar beam along the planned trajectory of the payload. This special radar experiment allowed to obtain basic information about the spatial structure of the PMWE and its dynamical behavior around the flight of the two rockets. PMWE with signal strengths between 10−17 and 10−15 m−1 have been observed by MAARSY during the whole campaign period, starting with a moderate occurrence at the beginning which decreased towards the end of the campaign. Furthermore real common-volume observations by rocket instruments and radar soundings have been carried out at PMWE altitudes on up-leg and down-leg of the rocket flights. The Saura MF radar was operated during both flights probing the mesosphere with a multiple beam scan experiment to derive horizontal winds and electron density profiles. The obtained PMWE characteristics as signal strength and spectral width of the received radar signals as well as estimated horizontal winds and electron densities are presented with particular emphasis to the launch times of the sounding rockets.

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Section: Spectral Width Analysis Of Radar Datamentioning

confidence: 89%

Section: Saura Mf Radar: Experiments Configuration Data Analysis and mentioning

confidence: 99%

Section: Saura Mf Radar: Experiments Configuration Data Analysis and mentioning

confidence: 99%

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D region observations by VHF and HF radars during a rocket campaign at Andøya dedicated to investigations of PMWE

2019

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“…PRRs use the mechanism of partial reflection through the ionized component in the atmosphere as a tracer for the neutral motions in the MLT between 50 and 100 km altitude, depending on the instrument configuration and by means of the solar and geomagnetic conditions (see, e.g., Fukao and Hamazu, 2014;Reid, 2015). The Saura PRR, located in Andøya (69.1 • N, 16.0 • E), has been in operation since 2004 (e.g., Singer et al, 2005;Renkwitz and Latteck, 2017). For the middle latitudes, we use measurements from Juliusruh PRR (54.6 • N, 13.4 • E) that were obtained between 2004 and 2020 with a comparable system and method (e.g., Hoffmann et al, 2010).…”

Section: Partial Reflection Radarsmentioning

confidence: 99%

Long-term studies of mesosphere and lower-thermosphere summer length definitions based on mean zonal wind features observed for more than one solar cycle at middle and high latitudes in the Northern Hemisphere

et al. 2022

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Abstract. Specular meteor radars (SMRs) and partial reflection radars (PRRs) have been observing mesospheric winds for more than a solar cycle over Germany (∼ 54∘ N) and northern Norway (∼ 69∘ N). This work investigates the mesospheric mean zonal wind and the zonal mean geostrophic zonal wind from the Microwave Limb Sounder (MLS) over these two regions between 2004 and 2020. Our study focuses on the summer when strong planetary waves are absent and the stratospheric and tropospheric conditions are relatively stable. We establish two definitions of the summer length according to the zonal wind reversals: (1) the mesosphere and lower-thermosphere summer length (MLT-SL) using SMR and PRR winds and (2) the mesosphere summer length (M-SL) using the PRR and MLS. Under both definitions, the summer begins around April and ends around middle September. The largest year-to-year variability is found in the summer beginning in both definitions, particularly at high latitudes, possibly due to the influence of the polar vortex. At high latitudes, the year 2004 has a longer summer length compared to the mean value for MLT-SL as well as 2012 for both definitions. The M-SL exhibits an increasing trend over the years, while MLT-SL does not have a well-defined trend. We explore a possible influence of solar activity as well as large-scale atmospheric influences (e.g., quasi-biennial oscillation (QBO), El Niño–Southern Oscillation (ENSO), major sudden stratospheric warming events). We complement our work with an extended time series of 31 years at middle latitudes using only PRR winds. In this case, the summer length shows a breakpoint, suggesting a non-uniform trend, and periods similar to those known for ENSO and QBO.

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“…The Saura PRR, located in Andøya (69.1 • N, 16.0 • E), has been in operation since 2004 (e.g. Singer et al, 2005;Renkwitz and Latteck, 2017). For the mid-latitudes, we use measurements from Juliusruh PRR (54.6 • N, 13.4 • E) that were obtained between 2004 and 2020 with a comparable system and method (e.g.…”

Section: Partial Reflection Radarsmentioning

confidence: 99%

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Jaen

2021

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Variability of virtual layered phenomena in the mesosphere observed with medium frequency radars at 69°N

Cited by 14 publications

References 26 publications

D region observations by VHF and HF radars during a rocket campaign at Andøya dedicated to investigations of PMWE

D region observations by VHF and HF radars during a rocket campaign at Andøya dedicated to investigations of PMWE

Long-term studies of mesosphere and lower-thermosphere summer length definitions based on mean zonal wind features observed for more than one solar cycle at middle and high latitudes in the Northern Hemisphere

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