The IONORT-ISP-WC system: Inclusion of an electron collision frequency model for the D-layer

Settimi, Alessandro; Pietrella, M.; Pezzopane, Michael; Bianchi, C.

doi:10.1016/j.asr.2014.07.040

Cited by 13 publications

(8 citation statements)

References 27 publications

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“…The International Reference Ionosphere (IRI) is the accepted standard for the climatological representation of the ionosphere by the International Organization for Standardization (ISO) [ Bilitza et al , ]. It is regularly applied in ionospheric assimilation frameworks [ Komjathy and Langley , ; Komjathy et al , ; Hernandez‐Pajares et al , ; Bust et al , ; Schmidt et al , ; Zeilhofer et al , ; Pezzopane et al , ; Galkin et al , ], in radar altimetry [ Ovodenko et al , ], in theoretical ring current models [ Ebihara et al , , ], and in high‐frequency (HF) communications forecasting [ Jodalen et al , ; Settimi et al , ; Athieno et al , ]. While several studies speak to the accuracy of the IRI at midlatitude and low latitude [ Sethi et al , ; Ehinlafa et al , ; Ezquer et al , ; Bilitza et al , ; Wichaipanich et al , ], the same cannot necessarily be said for its application to high‐latitude regions, where transport and particle precipitation events dominate ionospheric variability for large portions of the year [ Carlson , ; MacDougall and Jayachandran , ; Jayachandran et al , , ].…”

Section: Introductionmentioning

confidence: 99%

Solar activity variability in the IRI at high latitudes: Comparisons with GPS total electron content

Themens

Jayachandran

2016

JGR Space Physics

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Total electron content (TEC) measurements from 10 dual‐frequency GPS receivers in the Canadian High Arctic Ionospheric Network (CHAIN) are used to evaluate the performance of International Reference Ionosphere (IRI)‐2007 within the Canadian sector. Throughout the region, we see systematic underestimation of daytime TEC, particularly at solar maximum, where summer and equinox root‐mean‐square errors reach as high as 14 total electron content units, 1 TECU = 1016 el m−2 (TECU). It is also shown that the use of a monthly IG index, in place of the IRI's standard IG12 index, leads to an improvement in TEC specification by up to 3 TECU in the polar cap and up to 6 TECU in the subauroral region during periods of short‐term, large amplitude changes in solar activity. On diurnal timescales, variability in TEC is found to be underestimated by the IRI, during equinox periods, by up to 40% at subauroral latitudes and up to 70% in the polar cap region. During the winter, diurnal variations are overestimated by up to 40% in the subauroral region and are underestimated within the polar cap by up to 80%. Using collocated ionosonde data, we find IRI bottomside TEC to be within 1 TECU of observation with errors largest during the equinoxes. For the topside we find good agreement during the winter but significant underestimation of topside TEC by the IRI during summer and equinox periods, exceeding 6 TECU at times. By ingesting measured NmF2 into the IRI, we show that the topside thickness parameterization is the source of the bulk of the observed TEC errors.

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Section: Introductionmentioning

confidence: 99%

Solar activity variability in the IRI at high latitudes: Comparisons with GPS total electron content

Themens

Jayachandran

2016

JGR Space Physics

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“…To take into account a weak absorption χ during radio wave propagation, for example, in D layer [ Ginzburg , ; Settimi et al , , ], one should include the multiplier

e^{- 2 \int_{0}^{c T_{n}} χ (\overset{R}{overrightarrow} ({\overset{Λ}{true}}_{n}, S^{'}, ω_{0})) d S^{'}}

into each of

A_{n}^{H} ((), \overset{r}{overrightarrow}), A^{I} ((), \overset{r}{overrightarrow})

, and the multiplier

e^{- \int_{0}^{c T_{n}} χ ((), \overset{R}{overrightarrow} ((), {\overset{Λ}{true}}_{n}, S^{'}, ω_{0})) d S^{'} - \int_{0}^{c T_{m}} χ ((), \overset{R}{overrightarrow} ((), {\overset{Λ}{true}}_{m}, S^{'}, ω_{0})) d S^{'}}

into

A_{n, m} ((), \overset{r}{overrightarrow})

.…”

Section: Resulting Superdarn Radar Equationmentioning

confidence: 99%

“…To take into account a weak absorption during radio wave propagation, for example, in D layer [Ginzburg, 1970;Settimi et al, 2014Settimi et al, , 2015, one should include the multiplier e −2 ∫ cT n 0 ( − → R (Λ n ,S ′ , 0 ))dS ′ into each of A H n ( − → r ) ,…”

Section: Radio Sciencementioning

confidence: 99%

SuperDARN scalar radar equations

2016

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The quadratic scalar radar equations are obtained for Super Dual Auroral Radar Network (SuperDARN) radars that are suitable for the analysis and interpretation of experimental data. The paper is based on a unified approach to obtaining the radar equations for the monostatic and bistatic sounding with the use of Hamiltonian optics and ray representation of scalar Green's function and without taking into account the polarization effects. The radar equation obtained is the sum of several terms corresponding to the propagation and scattering over the different kinds of trajectories, depending on their smoothness and the possibility of reflection from the ionosphere. It is shown that the monostatic sounding in the media with significant refraction, unlike the case of refraction‐free media, should be analyzed as a combination of monostatic and bistatic scattering. This leads to strong dependence of scattering amplitude on background ionospheric density due to focusing mechanism and appearance of new (bistatic) areas of effective scattering with significant distortion of the scattered signal spectrum. Selective properties of the scattering have been demonstrated as well.

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“…Сол-нечный радиошум и радиовсплески (внезапные усиления радиоизлучения), открытые в 40-х гг. прошлого века, достаточно активно исследуются по сей день [Bastian et al, 1998;Solar and Space Weather Radiophysics..., 2004;Lee, 2007;Shibasaki et al, 2011].…”

Section: солнечные радиовсплескиunclassified

Space weather impact on radio device operation

Berngardt¹

2017

Solnechno-Zemnaya Fizika

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Аннотация. В работе проведен обзор влияния факторов космической погоды на работу радио-средств. Обзор основан на работах, монографиях и стратегических научных планах исследования кос-мической погоды последних лет. Основное внима-ние уделено влиянию ионосферных процессов, обу-словленных космической погодой, на распростра-нение радиоволн, в основном коротких. Приведены некоторые примеры такого влияния на основе дан-ных радара EKB ИСЗФ СО РАН на 2012-2016 гг.: ослабление сигналов возвратно-наклонного зонди-рования во время солнечных вспышек, эффекты пе-ремещающихся ионосферных возмущений различных масштабов в сигналах возвратно-наклонного зондиро-вания, эффекты магнитосферных волн в сигналах ионосферного рассеяния.Ключевые слова: космическая погода, аппара-турные эффекты.Abstract. This paper reviews the space weather impact on operation of radio devices. The review is based on recently published papers, books, and strategic scientific plans of space weather investigations. The main attention is paid to ionospheric effects on propagation of radiowaves, basically short ones. Some examples of such effects are given based on 2012-2016 ISTP SB RAS EKB radar data: attenuation of ground backscatter signals during solar flares, effects of travelling ionospheric disturbances of different scales in ground backscatter signals, effects of magnetospheric waves in ionospheric scatter signals.

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The IONORT-ISP-WC system: Inclusion of an electron collision frequency model for the D-layer

Cited by 13 publications

References 27 publications

Solar activity variability in the IRI at high latitudes: Comparisons with GPS total electron content

Solar activity variability in the IRI at high latitudes: Comparisons with GPS total electron content

SuperDARN scalar radar equations

Space weather impact on radio device operation

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