Nocturnal disturbances of total electron content and their correlation with VHF radio wave scintillations in the Pacific‐Asia region

Xu, Jisheng; Yeh, K. C.

doi:10.1029/93rs01077

Cited by 2 publications

(2 citation statements)

References 14 publications

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“…For example, Bowman [ 1960a, b] found that at least some instances of midlatitude spread F are caused by TIDs. Xu and Yeh [1993] found that nighttime TIDs were correlated with VHF radio wave scintillations.…”

Section: Introductionmentioning

confidence: 97%

Traveling ionospheric disturbances observed in digitized polarimeter data

Daniell¹,

Brown²,

Strickland³

et al. 1996

Radio Science

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Faraday rotation data from a pair of polarimeters located in Tucson, Arizona during the first half of 1990 have been examined for evidence of traveling ionospheric disturbances. With the use of digital filtering techniques, oscillations in total electron content (TEC) with periods ranging from 20 to 90 minutes and amplitudes of 1-5 x 1016 m '2 have been detected in the data. When present, the oscillations persist for varying time intervals (usually several hours) and show considerable variation from day to day. Although the viewing geometry (nearly along the local magnetic field line) is not ideal for observation of TIDs, these oscillations do appear to be real ionospheric oscillations. We have examined the possibility that the oscillations are not caused by actual changes in electron content but rather are due to changes in the Faraday rotation resulting from the motion of the ionospheric plasma along a magnetic field line and the resulting change in effective magnetic field strength. Our calculations indicate waves with displacement amplitudes of a few tens of kilometers would be sufficient to explain the observations. We also examined the possibility that the oscillations could be due to actual changes in TEC by using a one-dimensional F region model and imposing a plausible wind oscillation (simulating a gravity wave). We found that a wave with a velocity amplitude of 15 m s 'l was also sufficient to explain the observations. We expect that the observations are best explained by a combination of the two effects, that is, an actual oscillation in electron content and an oscillation in Faraday rotation, both caused by gravity waves in the thermosphere. We estimate that for the 90-min oscillations, 25% of the amplitude is due to the Faraday rotation effect and 75% is due to an actual change in. TEC.

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Section: Introductionmentioning

confidence: 97%

Traveling ionospheric disturbances observed in digitized polarimeter data

Daniell¹,

Brown²,

Strickland³

et al. 1996

Radio Science

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“…The China longitudinal sector is one interesting transitional zone from the American‐African sector to Pacific sector where the characteristics of the ionospheric irregularities occurrence in low latitude are very different [ Basu et al , 2006]. Nevertheless, because of the shortage of the ionospheric irregularities observation, the morphological variation of the ionospheric irregularities over China sector has revealed much more insufficiently than other longitudinal sectors [ Huang , 1970, 1978; Xu and Yeh , 1993]. Obviously, through the analysis of GPS effect related to the ionospheric irregularities, the morphology of the ionospheric irregularities in the low latitude can be partly revealed.…”

Section: Introductionmentioning

confidence: 99%

Solar cycle variation of the GPS cycle slip occurrence in China low-latitude region

et al. 2010

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Using the Global Positioning System (GPS) cycle slip data detected from the observations of two GPS stations over China low‐latitude region from 1999 to 2005, the solar cycle variation of cycle slip occurrence is studied. It is found that the cycle slip occurrence in these two stations varies with solar cycle and shows good temporal correlation; the cycle slip occurs in solar maximum years (1999–2002) much more frequently than that in solar minimum years (2003–2005). In solar maximum years, the seasonal and diurnal dependences of cycle slip occurrence are obvious as shown by previous studies; that is, for seasonal dependence cycle slip mainly occurs in the equinox months and for diurnal dependence cycle slip mainly occurs from 1900 LT to midnight. In solar minimum years, the similar diurnal dependence of cycle slip still exists, nevertheless, the seasonal dependence of cycle slip is not obvious due to small cycle slip occurrence. In the meantime, the spread F occurrence also shows seasonal and diurnal dependence, but there are some differences compared with cycle slip occurrence. During the period from 2000 to 2002, the Q‐type spread F mainly occurs in the equinox months; from 2003 to 2005, the Q‐type spread F occurs mainly in summer months. As for the diurnal distribution, the Q‐type spread F mainly occurs from 2000 LT to sunrise time and lasts much longer than the cycle slip does, and the F‐type spread F mainly occurs after midnight and is very different with the cycle slip occurrence. Considering the reasons for cycle slip phenomenon in GPS observations, it is thought that the statistical results of cycle slip occurrence with solar cycle, season, and local time just reflect the temporal distribution of the ionospheric irregularities above a certain intense level over the observing region.

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Nocturnal disturbances of total electron content and their correlation with VHF radio wave scintillations in the Pacific‐Asia region

Cited by 2 publications

References 14 publications

Traveling ionospheric disturbances observed in digitized polarimeter data

Traveling ionospheric disturbances observed in digitized polarimeter data

Solar cycle variation of the GPS cycle slip occurrence in China low-latitude region

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