Some results of a sweep-frequency propagation experiment over an 1150-km east-west path

Wieder, Bernard

doi:10.1029/jz060i004p00395

Cited by 27 publications

(9 citation statements)

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“…During the war B eynon (4] extended these experiments to longer path lengths with improvemen ts in the recording technique. After World War II oblique-incidence work was extended to still greater distances in Germany (5 , 6, 7, 8, 9], Canada (10,11,12], the United States (13,14,15], and Japan (16]. I The results of these investigations will be considered in th e following section.…”

Section: Introductionmentioning

confidence: 99%

Ionospheric investigations using the sweep-frequency pulse technique at oblique incidence

Agy¹,

Davies²

1959

J. RES. NATL. BUR. STAN. SECT. D. RAD. PROP.

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This paper describes the prese nt state of obliqu e-in cidencc in vestigaLion s of Lhc ionosphere, using the sweep-frequency pulse technique, with sp ecial reference to the work canied out. at tl?e ~ ational Bureau of Standards. After a short r eview of the publi hed li terature, obhque-lllCldence sweeps are presented showing the diurnal a nd seasonal variations Oll two east-west paths of lengths 1,150 kilometers and 2,370 kilom eters. The discrep ancies between observed and calculated maximum usable frequencies are presented for both p ath s and then various phenomena of interest are shown. Finally, the a bove phenome na are disc ussed in the light of existing knowledge and theory and, in particula r, it i shown that the di screpa ncies between observed and calculated maximum usable fr equ e nci es are unlikely to be caused by magn etoionic d eviation of the ray.

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Section: Introductionmentioning

confidence: 99%

Ionospheric investigations using the sweep-frequency pulse technique at oblique incidence

Agy¹,

Davies²

1959

J. RES. NATL. BUR. STAN. SECT. D. RAD. PROP.

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“…Considerably more ambitious bistatic oblique sounding experiments than ours have been conducted [e.g., Wieder, 1955;Agy and Davies, 1959], and oblique sounding is at present routinely used for propagation path diagnosis [Fenwick, 1980]. The novelty of the present results lies mainly in the relative simplicity with which they were obtained, and the apparent adequacy of very simple mode identification methods.…”

Section: Discussionmentioning

confidence: 74%

First bistatic oblique‐incidence ionograms between digital ionosondes

Wright¹,

Kressman²

1983

Radio Science

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Identical digital ionosondes (dynasondes) at Brighton Colorado and at White Sands Missile Range, New Mexico, 864 km distant, were synchronized for bistatic sounding in multifrequency and fixed frequency recording patterns. Three propagation modes are observed, identified, and reconciled with standard propagation theory; these include one-hop propagation by sporadic E (Es) and the F region and two-hop (F-Es). Echo phase measurements at the four spaced antennas of the dynasonde receiving array permit echolocation calculations that are in good agreement with the path mid point, although effects of ionosopheric tilts and time variations are evident. These results encourage the concept of a global real time ionospheric monitoring network consisting of about 90 instruments that perform vertically incident and coordinated bistatic soundings, to yield a total of about 320 measurement 'locations.' Recently, consideration has been given to the practicality of global ionospheric monitoring by a thoughtfully deployed network of about 90 modern digital ionosondes [Wright and Paul, 1981]. An essential feature of that notion, by which an adequate spatial resolution is maintained despite this relatively small number (there are about 160 analog ionosondes operating today) is the use of more sophisticated instruments in both vertical and bistatic oblique measurement modes. The typical interstation distances in the network advocated are about 2500 km. Each station is the center of a ring of 5 or 6 others; with each proximate pair conducting bistatic soundings, about 260 additional measurement locations are obtained. We have therefore considered it useful to exploit the first practical opportunity to attempt bistatic soundings with a pair of digital ionosondes. Identical Dynasondes [Grubb, 1979], were established at NOAA's research site at Brighton, Col-

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“…For the Norilsk-Tory path k = 1,06983 (path length D = 2088 km). Values of k for other paths lengths are shown in [9]. Angle of ray falling ϕ on the layer according to the equivalent theorem is related to the acting height ' h by the following formula [8].…”

Section: F 0 F2 Calculation In the Os Path' Midpointmentioning

confidence: 99%

<title>Estimation of critical frequency and height maximum for path middle point on evidence derived from experimental oblique sounding data: comparison of calculated values with experimental and IRI values</title>

Kim

Kotovich

2006

SPIE Proceedings

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The work is devoted to experimental checking of technique for estimation of f 0 F2 and hmF2 values in path' midpoint through oblique sounding (OS) data. In this work data obtained by Irkutsk chirp-sounder on the Norilsk-Irkutsk path were used and data obtained by Podkamennaya Tunguska ionospheric station (which located near estimating path' middle point) were used also. During the calculation, the experimental distance-frequency characteristics (DFC) of path are recalculated into height-frequency characteristics (HFC) in path' midpoint by means of Smith method. It lets us to determine f 0 F2 value in path' middle point. For hmF2 definition N(h) profile is used which was obtained by recalculation of HFC by means the Guliaeva technique. Also the fast method of recalculation was probed in two DFC points. In the work comparison was made between calculated f 0 F2 values and experimental f 0 F2 values obtained by Podkamennaya Tunguska ionospheric station. Comparison of estimating hmF2 values with values calculated by Dudeney method from experimental f 0 E, f 0 F2, M(3000)F2 values at Podkamennaya Tunguska was carried out. In addition, estimating values was compared with values given by the IRI model. A capability of the IRI model adaptation by f 0 F2 and hmF2 values was investigated. It will help during diagnostics, working out regional models of ionosphere and during the adaptation of various models of ionosphere to the real conditions.

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Some results of a sweep-frequency propagation experiment over an 1150-km east-west path

Cited by 27 publications

References 2 publications

Ionospheric investigations using the sweep-frequency pulse technique at oblique incidence

Ionospheric investigations using the sweep-frequency pulse technique at oblique incidence

First bistatic oblique‐incidence ionograms between digital ionosondes

<title>Estimation of critical frequency and height maximum for path middle point on evidence derived from experimental oblique sounding data: comparison of calculated values with experimental and IRI values</title>

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