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Showing papers in "Journal of Atmospheric and Solar-Terrestrial Physics in 1988"


Journal ArticleDOI
TL;DR: In this paper, when the data are stratified according to the east or west phase of the quasi-biennialoscillation (QBO) in the equatorial stratosphere, significant correlations result: when the QBO was in its west phase the polar data were positively correlated with the solar cycle while those in middle and low latitudes were negatively correlated.

521 citations


Journal ArticleDOI
TL;DR: In this article, an empirical model of the vertical distribution of the electron concentration of the ionosphere based on quasi-parabolic segments is presented, which is quite flexible and any number of ionospheric layers, valleys and "ledges" can be incorporated.

130 citations


Journal ArticleDOI
TL;DR: In this paper, the authors present the temporal and spatial properties for a number of sudden developments of narrow sodium layers in the 90-100 km altitude region and study the correlation of the growth phase of sudden sodium layers and of sporadic E layers.

118 citations


Journal ArticleDOI
TL;DR: In this article, the authors detected wind oscillations with periods ranging from 1.4 to 20 days at 80-110 km altitude using Kyoto meteor radar observations made in 1983-1985.

82 citations


Journal ArticleDOI
TL;DR: In this paper, the EISCAT incoherent scatter radar was used to observe the generation of atmospheric gravity waves in the auroral zone in conjunction with a network of magnetometers and riometers.

71 citations


Journal ArticleDOI
TL;DR: In this article, two radars were used simultaneously to study naturally occurring electron heating events in the auroral E-region ionosphere, and they concluded that the electron temperature increases were caused by plasma wave heating and not by either Joule heating or particle precipitation.

69 citations


Journal ArticleDOI
TL;DR: In this paper, an empirical model predicting the location of the main ionospheric trough is proposed, and the model is shown to be more appropriate than other available quantitative models for the latitudes covered by EISCAT.

66 citations


Journal ArticleDOI
TL;DR: In this paper, changes in total electron content during magnetic storms are compared at stations with similar geographic and geomagnetic latitudes and eastward declinations in the northern and southern hemispheres.

65 citations


Journal ArticleDOI
TL;DR: In this article, a study was made of data taken with EISCAT using the Common Program CP-3-C (F-region meridian scan) which shows that regions of enhanced ion temperature (in excess of 3000K at all three EISCat stations) are found on most days when Kp exceeds 2 or 3, usually accompanied by ion drift velocities of more than 1 km s−1.

55 citations


Journal ArticleDOI
TL;DR: In this article, the Jones-Galley technique was used to produce monthly median maps of foF2 for each hour, each month and for high and low levels of solar activity.

51 citations


Journal ArticleDOI
TL;DR: Two simplified models have been developed for the internal gravity wave dissipation due to viscosity, thermal conduction, and ion-drag in a multilayered, isothermal thermosphere as mentioned in this paper.

Journal ArticleDOI
TL;DR: In this paper, the response of a high frequency (HF) radar system to echoes backscattered from underdense meteor trails is calculated, and three propagation modes are identified according to whether the echo is received along the direct (line-of-slight) path, or along two possible paths from beyond the horizon involving ionospheric reflection.


Journal ArticleDOI
TL;DR: In this paper, Park et al. reported that at lower L values the whistlers are ducted by stronger density enhancements and the median values of neq and NT as a function of L fit well to the density profiles published by Park et.

Journal ArticleDOI
TL;DR: In this paper, a new statistical inversion method to estimate the errors in incoherent scatter measurements for a given set of ionospheric parameters is presented, and the possibilities to determine the ion composition in a multiparameter fit are considered.

Journal ArticleDOI
TL;DR: In this paper, a model of the auroral backscatter amplitude was derived for the radar geometry appropriate to joint observations by the PGI auroral radars at Karmaselga and Essoyla and the EISCAT incoherent scatter radar.

Journal ArticleDOI
TL;DR: In this paper, large upward ion fluxes are observed near the polar cap/auroral zone boundary in the midnight-dawn sector, and these results are consistent with the observations presented in this paper.

Journal ArticleDOI
TL;DR: In this article, the meridional distribution of both total solar and net radiative heating rates have been obtained between 30 and 110 km at both the solstice and equinox using Fomichev et al.'s total radiative long wave cooling data in the calculations of the Net Radiative heating.

Journal ArticleDOI
TL;DR: In this paper, a theory was developed to give the error in the determination of the position of the maximum of a cross correlation function and the value of lag such that the auto-correlation falls to a value equal to that of the cross correlation at zero lag.

Journal ArticleDOI
TL;DR: In this paper, simultaneous Fabry-Perot Interferometer (FPI) and Incoherent Scatter Radar (ISR) observations from Arequipa and Jicamarca, Peru, respectively, were obtained on 24 and 25 September 1986.

Journal ArticleDOI
TL;DR: In this paper, the spectral width variations with altitude were interpreted in terms of ion-neutral collision frequency, neutral temperature, mean positive ion mass and negative ion number density, and it was suggested that the layer is composed of proton hydrates in the vicinity of a structured noctilucent cloud, and that the index of hydration is occasionally large.

Journal ArticleDOI
TL;DR: In this paper, a thin and intense sporadic E -layer drifting vertically within the altitude region 102-105 km has been observed with a 300m range resolution, where the drift speed of the layer is approximately equal to the measured vertical plasma velocity.

Journal ArticleDOI
TL;DR: In this article, mesospheric backscattered VHF echo power and wind velocity data indicate the coexistence of a threefold strongly echoing layer and a wave motion, observed on 20 September 1985 with the MU radar at Shigaraki (34.9°N, 136.1°E), Japan.

Journal ArticleDOI
TL;DR: Doppler measurements at mesospheric heights were carried out in June 1984 using the mobile SOUSY VHF radar at Andenes/Norway (69°N, 16°E).

Journal ArticleDOI
TL;DR: In this article, the authors discuss the role of off-vertical reflections which result from tilted isoionic contours associated with the passage of travelling ionospheric disturbances (TIDs) in producing both resolved and unresolved range spread on ionograms and show that range spread consists primarily of discrete satellite traces even though at times these traces overlap and vary in intensity as a function of frequency.

Journal ArticleDOI
TL;DR: In this article, a Ps 6 pulsation event was recorded by the EISCAT magnetometer cross in northern Scandinavia during the recovery phase of a geomagnetic storm, during which a two-dimensional pattern of the Hall and Pedersen conductivities were constructed for one Ps 6 period.

Journal ArticleDOI
TL;DR: In this paper, the authors investigate the diurnal and seasonal variations of the simultaneous occurrence of medium-scale irregularities in the electron concentration in the F -region of the ionosphere at conjugate magnetic mid-latitude regions.

Journal ArticleDOI
TL;DR: In this paper, the saturation level of the electron density at the geo-synchronous orbit and the refilling rate under different conditions of geomagnetic activity have been obtained and are found to be 70.5 cm −3 and 7 −25 cm−3 day −1, respectively.

Journal ArticleDOI
TL;DR: In situ measurements from the Atmosphere Explorer-E satellite are used to obtain the daily variations of the meridional wind at + or - 18 deg latitude for summer and winter between 1977 and 1979 as mentioned in this paper.

Journal ArticleDOI
TL;DR: In this paper, an extended period (1973-1985) of recording of random and Fresnel type quasi-periodic (QP) scintillations in southern mid-latitudes, using satellite beacon transmissions at a frequency of 150 MHz, has provided some new information on the morphology of scintillation-producing irregularities.