Dominant configurations of scintillation‐producing irregularities in the auroral zone

Fremouw, E. J.; Lansinger, John M.

doi:10.1029/ja086ia12p10087

Cited by 21 publications

(11 citation statements)

References 15 publications

(11 reference statements)

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“…In the dawn sector there is a deep minimum in the scatter rate that can be explained by an enhancement in HF wave absorption due to intense electron precipitation. In the dusk sector there is an increase in the scatter rate that could be related to scintillations from subauroral irregularities (Basu, 1978;Fremouw and Lansinger, 1981), as shown by Ruohoniemi et al (1988).…”

Section: Data Selectionmentioning

confidence: 99%

Influence of magnetospheric processes on winter HF radar spectra characteristics

et al. 2002

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Abstract. This study investigates further the relationship between regions of the magnetosphere and the characteristics of HF radar Doppler spectra recorded in the ionospheric projection of those regions. It builds on earlier work, which has reported a relationship between the Doppler spectral width and the ionospheric projection of the magnetospheric cusp region, by introducing novel techniques for classifying the Doppler spectra recorded by the SuperDARN radars. We first review the geophysical factors that can condition the characteristics of the autocorrelation function (ACF) data produced by the radars. This leads to a classification scheme of the ACF data which is then applied to a large database compiled from winter data taken by the Northern Hemisphere Super-DARN radars. This statistical study shows that the ACF characteristics are not randomly distributed in space, but rather are spatially organized in the ionosphere. This paper suggests that these regions are ordered primarily by the low energy (≈ 1 keV) electron precipitation region and the presence of intense ULF wave activity.

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Section: Data Selectionmentioning

confidence: 99%

Influence of magnetospheric processes on winter HF radar spectra characteristics

et al. 2002

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“…They interpreted this behaviour as a geometrical effect due to the presence of sheet-like irregularities in the ionosphere lying along L-shells. Recently, Fremouw and Lansinger (19) have extended the examination of these results. They conclude that the effect occurs only in the nighttime ionosphere and even then only when the station lies poleward of the high-latitude scintillation boundary.…”

Section: Geometrical Effectsmentioning

confidence: 93%

“…Rino et al (14) and Fremouw and Lansinger ( 19) have used data of this kind to infer an east-west elongation of the irregularities (in the nomenclature of this paper, b > I). Since there is so much scatter in the data (due nlostly to the highly variable ionosphere at these latitudes), it does not seem reasonable to infer anything more from these data than that there is, quite clearly, a significant degree of elongation along the magnetic field lines (that is c * I).…”

Section: Geometrical Effectsmentioning

confidence: 97%

High latitude ionospheric scintillations

Fulford¹,

Forsyth²

1984

Can. J. Phys.

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The statistical characteristics of ionosphcric irrcgularitics arc often dcscribcd by specifying onc or two of thc statistical parametcrs of thc scintillations that the irregularities producc in satcllitc radio signals. Thc most commonly used paramctcr for this purposc is thc spectral indcx (slope of thc powcr spcctral density function on a log-log plot). While it is becoming increasingly clcar that thc characterization of cithcr phasc or arnplitudc scintillations by a singlc pararnctcr may obscure significant characteristics of thc scintillations, this simple approach has provcn to bc ~rscful for the prediction of thc bchaviour of transionosphcric propagation paths such as thosc used in wrious space application systcms. This papcr cxplorcs the use, in addition to thc usual phase and amplitudc obscrvations, of measurcmcnts of anglc-of-arrival, in ordcr to charactcrizc thc scintillations. Sincc cach of these obscrvations rcprcscnt a diffcrcnt kind of obscrvational "filtering", the combination of one statistical paralnctcr from each typc of rncasurcmcnt should providc a morc adcquatc characterization of thc scintillations. I t is found that thc usc of thc widths of thc autocorrclation functions for this purposc is prcfcrrcd ovcr thc usc of spcctral indices.On dicrit souvcnt Ics caractdristiqucs statistiqucs dcs irrdgularitds ionosphdriqucs cn spdcifiant un ou deux dcs paramttres statistiqucs dcs scintillations quc Ics irrdgularitds produiscnt dans Ics signaux radio, dcs satcllitcs. LC parametre lc plus comrnun6rncnt utilisd h cctte fin cst I'indice spectral (la pentc dc la fonction dcnsitd spectralc dc puissance en Cchcllc log-log). Bien qu'il dcviennc de plus cn plus dvidcnt que la caractkrisation dcs scintillations dc phase ou d'amplitude par un scul paramttrc pcut obscurcir lcs calacteristiqucs significatives dcs scintillations. ccttc approchc simple s'cst averde utile pour la prediction du comportcnicnt dcs parcours de propagation trans-ionosphdricluc comme ccux qu'on utilisc dans divers systemes d'applications spatialcs. Dans cet article, on explore I'utilisation. en plus dcs obscrvations usucllcs de phase ct d'amplitude, de mcsurcs dc I'anglc d'arrivdc pour caracteriscr lcs scintillations. Etant donne quc chacune de ccs obscrvations rcprescnte une diffCrcntc sortc de "filtrage" obscrvationnel, on dcvrait obtenir, en prenant un paranittre statistiquc vcnant dc chaque type de mcsure, Lrne combinaison donnnnt une caractkrisation plus adequate dcs scintillations. On trouve qu'il cst prefCrablc d'utiliscr h cette fin lcs largeurs dcs fonctions d'autocorrdlation, plutBt que les indices spcctraux.[Traduit par le journal]Can.

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“…These have provided statistical information on geographic, time of day, seasonal and magnetic activity dependence of irregularity occurrence (summarized in Table 1), on their scale size distribution (a typical example is shown in Fig. 1), and some studies of field alignment and shape have been made (Fremouw and Lansinger, 1981).…”

Section: Some Initial Observations Are Includedmentioning

confidence: 99%

Eiscat Electron Density Studies.

Hargreaves¹,

Burns²

1985

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Dominant configurations of scintillation‐producing irregularities in the auroral zone

Cited by 21 publications

References 15 publications

Influence of magnetospheric processes on winter HF radar spectra characteristics

Influence of magnetospheric processes on winter HF radar spectra characteristics

High latitude ionospheric scintillations

Eiscat Electron Density Studies.

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