Southern polar cap DPS and CADI ionosonde measurements: 1. Ionogram comparison

Morris, R. J.; Monselesan, Didier; Hyde, M.; Breed, A. M.; Wilkinson, P. J.; Parkinson, M. L.

doi:10.1016/j.asr.2003.08.010

Cited by 11 publications

(5 citation statements)

References 3 publications

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“…At each station, two types of digisondes, namely, the Canadian Advanced Digital Ionosonde (CADI) and the Digital Portable Sounder 4D (DPS‐4D), perform routine ionospheric vertical sounding. Concurrent operation has shown that these two digital ionosondes employ different antenna arrays and digital signal processing techniques yet nevertheless are closely related instruments [ Morris et al , ]. More detailed description about the CADI and DPS‐4D ionosondes can be found in the relevant literature [e.g., MacDougall et al , ; Reinisch et al , ].…”

Section: Methodsmentioning

confidence: 99%

Evidence for lightning‐associated enhancement of the ionospheric sporadic E layer dependent on lightning stroke energy

Xue

et al. 2015

JGR Space Physics

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In this study we analyze the lightning data obtained by the World‐Wide Lightning Location Network (WWLLN) and hourly ionospheric data observed by ionosondes located at Sanya and Beijing, to examine the changes in ionospheric electron density in response to the underlying thunderstorms and to investigate the possible connection between lightning discharges and the enhancement of the ionospheric sporadic E(Es) layer. We identify a statistically significant enhancement and a decrease in altitude of the Es layer at Sanya station, in agreement with the results found at Chilton, UK. However, the lightning‐associated modification of the Es layer investigated using the same approach is not evident at Beijing station. Furthermore, we compare the responses to weak and strong lightning strokes using WWLLN‐determined energies at Sanya in 2012. The lightning‐associated enhancement of the Es layer is predominantly attributed to powerful strokes with high stroke energy. A statistically significant intensification of the Es layer with higher‐energy strokes at Sanya, along with the statistical dependence of lightning‐associated enhancement of the Es layer on stroke energy, leads us to conclude that the magnitude of the enhancement is likely associated with lightning stroke energy.

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Section: Methodsmentioning

confidence: 99%

Evidence for lightning‐associated enhancement of the ionospheric sporadic E layer dependent on lightning stroke energy

Xue

et al. 2015

JGR Space Physics

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“…The echoes of the signal reflected by the ionosphere provide a profile of reflection frequency versus virtual height (the ionogram), which need to be inverted to give the electron density (directly related to the reflection frequency) profile as a function of actual height (Piggott and Rawer, 1972). Correct scaling of the returned data is difficult due to the lack of reliable models of the high-latitude ionosphere; several studies have compared different types of ionosonde (Romano et al, 2004;Morris et al, 2003), in an effort to improve scaling. Several different types of ionosondes are in use by various scientific communities such as the Digital Portable Sounder, DPS-4 (Haines and Reinisch, 1995), the KEL42 (Kelly, 1981), and the CADI (MacDougall, 1997) and a number of other ionosondes are in operation for IPY in both hemispheres.…”

Section: Vertical and Oblique Soundingmentioning

confidence: 99%

Probing the high latitude ionosphere from ground-based observations: The state of current knowledge and capabilities during IPY (2007–2009)

Alfonsi¹,

Kavanagh²,

Amata³

et al. 2008

Journal of Atmospheric and Solar-Terrestrial Physics

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a b s t r a c tDuring the International Polar Year (IPY), one area of great interest is co-coordinated, multi-instrument probing of the ionosphere at high latitudes. This region is important not only for the applications that rely upon our understanding of it, but also because it contains the footprints of processes that have their origin in the interplanetary space. Many different techniques are now available for probing the ionosphere, from radar measurements to the analysis of very low frequency (VLF) wave paths. Combining these methods provides the ability to study the ionosphere from high in the F-region to the bottom of the D-layer. Thus, coupling processes from the magnetosphere and to the neutral atmosphere can be considered. An additional dimension is through comparisons of the response of the two polar ionospheres to similar (or the same) geomagnetic activity. With more instruments available at the South Pole inter-hemispheric, studies have become easier to accomplish such that a fuller picture of the global response to Sun-Earth coupling can be painted. This paper presents a review of the current state of knowledge in ionospheric probing. It cannot provide a comprehensive guide of the work to date due to the scale of the topic. Rather it is intended to give an overview of the techniques and recent results from some of the instruments and facilities that are a part of the IPY cluster 63-Heliosphere Impact on Geospace. In this way it is hoped that the reader will gain a flavor of the recent research performed in this area and the potential for continuing collaboration and capabilities during the IPY

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“…The pulse compression technique using phase codes increases the SNR and range resolution for the low‐power transmission (Coll & Storey, ; Reinisch, ; Yao et al, ) as a long duration coded pulse contain the same energy content as a high power short duration pulse, and the received pulse can be compressed. Therefore, coherent integration and pulse compression are means of improving the SNR (Bianchi et al, ; Bibl, ; Reinisch, ; Morris et al, ). The 1 V peak‐to‐peak coded signal is provided as input to the HPA unit for amplification and feeding to the transmit antenna.…”

Section: System Descriptionmentioning

confidence: 99%

SAMEERDU—Digital Ionosonde: Brief System Description and Initial Results from a Low‐Latitude Location Dibrugarh

et al. 2019

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A digital ionosonde was designed and built by Society for Applied Microwave Electronics Engineering and Research (SAMEER), Mumbai in collaboration with Dibrugarh University to suit the needs of equatorial-and low-latitude regions of India. The design objectives were to obtain good signal-tonoise ratio to mitigate the heavy noise due to interference, obtain short duration ionograms, estimate vertical drifts, reconstruct vertical electron density profile, and make antenna size smaller. Transmission of maximum 1 kW power using modified delta antenna is used with dual channel magnetic loop receiver antenna. Pulse compression by 8-and 16-bit biphase codes are employed to increase noise immunity and the height resolution. The preliminary results of the ionogram mode only are presented in this work. The basic ionogram recorded by this system called SAMEER-Dibrugarh University Ionospheric Radar is compared with colocated Canadian Advanced Digital Ionosonde ionogram which is in operation in Dibrugarh since 2010. A reasonably clear trace of E and F layers is obtained even without coherent pulse integration and pulse coding. The performance of the coding schemes is investigated with and without coherent integration. Some sample ionospheric experiments conducted with SAMEER-Dibrugarh University Ionospheric Radar, and interesting results like the detection of travelling ionospheric disturbances, Es layer substructures, ionospheric irregularities, and the generation of bottom-side vertical electron density profile are presented to highlight the potential and capabilities of the system. Plain Language SummaryA new high-frequency sweeping radar or digital ionosonde was designed and developed by SAMEER, Mumbai in collaboration with Dibrugarh University. This type of radar is used for monitoring ionospheric conditions for high-frequency band and trans-ionospheric communications like Global Positioning System signals. Additionally, it has been one of the oldest but still relevant tool for research in the field of ionosphere.

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Southern polar cap DPS and CADI ionosonde measurements: 1. Ionogram comparison

Cited by 11 publications

References 3 publications

Evidence for lightning‐associated enhancement of the ionospheric sporadic E layer dependent on lightning stroke energy

Evidence for lightning‐associated enhancement of the ionospheric sporadic E layer dependent on lightning stroke energy

Probing the high latitude ionosphere from ground-based observations: The state of current knowledge and capabilities during IPY (2007–2009)

SAMEERDU—Digital Ionosonde: Brief System Description and Initial Results from a Low‐Latitude Location Dibrugarh

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