Investigation on the Distinct Nocturnal Secondary Sodium Layer Behavior Above 95 km in Winter and Summer Over Logan, UT (41.7°N, 112°W) and Arecibo Observatory, PR (18.3°N, 67°W)

Cai, Xuguang; Yuan, Tao; Eccles, J. V.; Raizada, S.

doi:10.1029/2019ja026746

Cited by 21 publications

(19 citation statements)

References 52 publications

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“…In 2017, Cai et al provide a numerical investigation on diurnal variation of sodium layer in the summer over USU, and proposed a possible mechanism for contributing to the formation of Nas-namely, the vertical transport by wind. In 2019, Cai et al [42] utilized a two-dimensional numerical model simulations, to investigate the mechanism that drives such summer winter difference of the Nas occurrence rate in the middle latitude. The observation of these phenomena is beneficial to the study of the characteristics of the atmospheric metal layer [43,44].…”

Section: Discussionmentioning

confidence: 99%

Continuous Detection of Diurnal Sodium Fluorescent Lidar over Beijing in China

Wang

Yang

et al. 2020

Atmosphere

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Based on application of the atomic filter technology in a signal detection system of lidar, the diurnal observation of sodium lidar were obtained using the system at the National Space Science Center of the Chinese Academy of Sciences at Beijing Yanqing station (40.5° N, 116° E) in April 2014. During the lidar observation period, among the 103 cases of continuous daytime observations, the longest time was 181 h. In the case of a continuous observation period of 5 days (13–18 October 2014), the signal-to-noise ratio reached to 19:1 at 12:00–13:00 Local Time of the daytime, when the spatial and time resolutions were respectively set to 96 m of 167 s. The improvements resulted in the highest detection level of any existing diurnal lidars in China. Some interesting phenomena such as the sporadic sodium layer have also been observed during the daytime. The daytime capability extended the observing time range of the earlier systems that were limited to only nighttime observations. This innovation provides a useful method for the studies of diurnal tides, photochemistry, gravity waves, and correlative modeling studies.

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Section: Discussionmentioning

confidence: 99%

Continuous Detection of Diurnal Sodium Fluorescent Lidar over Beijing in China

Wang

Yang

et al. 2020

Atmosphere

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“…Ground-based ionosonde data have been used to study the behavior of the ionosphere since the early 1930s and are regarded as providing reliable measurements of the intensities of Es layers over the subsequent decades (Rishbeth and Garriott 1969;Scott et al 2016). The meteoric metals such as Na, Fe and Ca atoms in the earth's mesosphere and lower thermosphere at 80-110 km altitude are most likely associated with the long-live metallic ions within Es layers (Cai et al 2019;Xun et al 2020). The frequency of the ionized plasma in Es layers is widely used to investigate the seasonal and local time variations in metallic ions in the earth's upper atmosphere (Yuan et al 2014;Yu et al 2019b).…”

Section: Methodsmentioning

confidence: 99%

Using GNSS radio occultation data to derive critical frequencies of the ionospheric sporadic E layer in real time

Scott

Xue

et al. 2020

GPS Solut

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The small-scale electron density irregularities in the ionosphere have a significant impact on the interruptions of Global Navigation Satellite System (GNSS) navigation and the accuracy of GNSS positioning techniques. The sporadic ionospheric E (Es) layer significantly contributes to the transient interruptions of signals (loss of lock) for GNSS tracking loops. These effects on the GNSS radio occultation (RO) signals can be used to derive the global location and intensity of Es layers as a complement to ground-based observations. Here we conduct statistical analyses of the intensity of Es layers, based on the scintillation index S4max from the FORMOSAT-3/COSMIC during the period 2006–2014. In comparison with simultaneous observations from an ionosonde network of five low-to-middle latitude ionosondes, the S4max indices from COSMIC, especially the small values, are linearly related to the critical frequency of Es layers (foEs). An accumulated period of less than 1 h is required to derive the short-term variations in real-time ionospheric Es layers. A total of 30.22%, 69.57% and 98.13% coincident hourly foEs values have a relative difference less than 10%, 30% and 100%. Overall, the GNSS RO measurements have the potential to provide accurate hourly observations of Es layers. Observations with S4max < 0.4 (foEs < 3.6 MHz), accounting for 66% of COSMIC S4 measurements, have not been used fully previously, as they are not easily visible in ground-based ionosonde data.

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“…According to theoretical concepts, the formation of sporadic layers in the E region of the ionosphere at mid-latitudes was due to the heterogeneity of the vertical structure of horizontal winds [71][72][73][74]. Despite the sporadic nature of the appearance of Es, regularities in the dynamics of its parameters made it possible to speak about the regularity of these variations.…”

Section: Influence Of Meteorological Storm On E and F Regions Of The mentioning

confidence: 99%

Meteorological Storm Influence on the Ionosphere Parameters

Borchevkina

Карпов

2020

Atmosphere

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This paper presents the observations of ionospheric parameters in Kaliningrad (54° N, 20° E) during a meteorological storm in the Baltic Sea during October 2017 and 2018. Analysis of the total electronic content (TEC) during the storm showed that perturbations of the TEC values from the median can reach two standard deviations of the value. For the critical frequency of the F2 layer, it was 1.5–1.6 times the standard deviations. On days of a meteorological storm, significant changes were noted in the dynamics of the E-layer’s critical frequency. The reasons for the occurrence of the observed phenomena were due to the propagation of acoustic-gravity waves generated by convective processes in the lower atmosphere during periods of a meteorological storm. Spectral analysis of TEC variations revealed an increase in the amplitudes of ionospheric variations 10–16 min over the area of a meteorological storm. The analysis allowed us to conclude that ionospheric perturbations during the meteorological perturbation were caused by increased acoustic-gravity wave (AGW) generation processes in the lower atmosphere. The most likely cause of negative ionospheric disturbances were processes associated with the dissipation of AGW propagating from the area of a meteorological storm and increased turbulence in the lower thermosphere.

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Investigation on the Distinct Nocturnal Secondary Sodium Layer Behavior Above 95 km in Winter and Summer Over Logan, UT (41.7°N, 112°W) and Arecibo Observatory, PR (18.3°N, 67°W)

Cited by 21 publications

References 52 publications

Continuous Detection of Diurnal Sodium Fluorescent Lidar over Beijing in China

Continuous Detection of Diurnal Sodium Fluorescent Lidar over Beijing in China

Using GNSS radio occultation data to derive critical frequencies of the ionospheric sporadic E layer in real time

Meteorological Storm Influence on the Ionosphere Parameters

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