Relevant bibliographies by topics / Ionospheric variabilities

Academic literature on the topic 'Ionospheric variabilities'

Author: Grafiati
Published: 6 September 2023

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Journal articles on the topic "Ionospheric variabilities"

1

Li, Lei, Shu Fang Zhang, Yi Zhuo Wang, and Qing Hu. "Solar Activity Effects on the Variabilities of Long-Term Ionospheric TEC." Advanced Materials Research 850-851 (December 2013): 1331–34. http://dx.doi.org/10.4028/www.scientific.net/amr.850-851.1331.

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To reveal the modulating effects of the solar activity on ionospheric TEC, the long-term characteristics of TEC were analyzed. The analysis was based on the data of the sunspot and data of GPS observation provided by IGS analysis centers from 1999 to 2011. The results showed that the variation of monthly mean TEC was of significant regularity. The regularity was caused mainly modulation action of solar activity. In view of the spatial variation of TEC, the monthly mean TEC can be well described for modeling and prediction on base of relationship between TEC and latitude.
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Tsai, Lung-Chih, Shin-Yi Su, Jun-Xian Lv, Terry Bullett, and Chao-Han Liu. "Multi-Station and Multi-Instrument Observations of F-Region Irregularities in the Taiwan–Philippines Sector." Remote Sensing 14, no. 10 (May 10, 2022): 2293. http://dx.doi.org/10.3390/rs14102293.

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In this study, a multi-station and multi-instrument system, organized and proposed for ionospheric scintillation and equatorial spread-F (ESF) specification and their associated motions in the Taiwan–Philippines sector, is outlined. The issues related to the scintillation and ESF event observed on 26 October 2021, at magnetic quiet conditions are presented and discussed. We first indicate the existence of a plasma bubble in the Taiwan–Philippines sector by using the FormoSat-7/Constellation Observing System for Meteorology, Ionosphere, and Climate-2 (FS7/COSMIC2) GPS/GLONASS radio occultation observations. We verify the latitudinal extent of the tracked plasma bubble using the recorded ionograms from the Vertical Incidence Pulsed Ionospheric Radar located at Hualien, Taiwan. We further discuss the spatial and temporal variabilities of two-dimensional vertical scintillation index VS4 maps based on the simultaneous GPS L1-band signal measurements from 133 ground-based receivers located in Taiwan and the surrounding islands. We also operate two high-sampling, software-defined GPS receivers and characterize the targeted plasma irregularities by carrying out spectrum analyses of the received signal. As a result, the derived plasma irregularities moved eastward and northward. Furthermore, the smaller the irregularity scale, the higher the spectral index and the stronger the scintillation intensity were at lower latitudes on the aimed irregularity feature.
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Medvedeva, Irina, and Konstantin Ratovsky. "Studying atmospheric and ionospheric variabilities from long‐term spectrometric and radio sounding measurements." Journal of Geophysical Research: Space Physics 120, no. 6 (June 2015): 5151–59. http://dx.doi.org/10.1002/2015ja021289.

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4

Gurubaran, S., D. Narayana Rao, G. Ramkumar, T. K. Ramkumar, G. Dutta, and B. V. Krishna Murthy. "First results from the CAWSES-India Tidal Campaign." Annales Geophysicae 26, no. 8 (August 5, 2008): 2323–31. http://dx.doi.org/10.5194/angeo-26-2323-2008.

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Abstract. The first CAWSES-India Tidal Campaign was conducted by the Indian scientific community during March–April 2006. The objectives of this campaign were: (1) To determine the characteristics of tides in the troposphere and lower stratosphere (0–20 km) and mesosphere and lower thermosphere (MLT) region (80–100 km), (2) to explore and identify what lower atmospheric processes drive middle atmospheric tides in the Indian continental region and (3) to provide information on those short-term variabilities of MLT tides that are likely to have an impact on the ionospheric variabilities and contribute to the upper atmospheric weather. Data sets from experiments conducted at the three low latitude radar sites, namely, Trivandrum (8.5° N, 76.9° E), Tirunelveli (8.7° N, 77.8° E) and Gadanki (13.5° N, 79.2° E) and fortnightly rocket launches from Thumba were made use of in this study. An important observational finding reported in this work is that the radar observations at Tirunelveli/Trivandrum indicate the presence of 15–20 day modulation of diurnal tide activity at MLT heights during the February–March period. A similar variation in the OLR fields in the western Pacific (120–160° longitude region) suggests a possible link between the observed tidal variabilities and the variations in the deep tropical convection through the nonmigrating tides it generates.
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Yue, X., W. Wan, L. Liu, and T. Mao. "Statistical analysis on spatial correlation of ionospheric day-to-day variability by using GPS and Incoherent Scatter Radar observations." Annales Geophysicae 25, no. 8 (August 29, 2007): 1815–25. http://dx.doi.org/10.5194/angeo-25-1815-2007.

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Abstract. In this paper, the spatial correlations of ionospheric day-to-day variability are investigated by statistical analysis on GPS and Incoherent Scatter Radar observations. The meridional correlations show significant (>0.8) correlations in the latitudinal blocks of about 6 degrees size on average. Relative larger correlations of TEC's day-to-day variabilities can be found between magnetic conjugate points, which may be due to the geomagnetic conjugacy of several factors for the ionospheric day-to-day variability. The correlation coefficients between geomagnetic conjugate points have an obvious decrease around the sunrise and sunset time at the upper latitude (60°) and their values are bigger between the winter and summer hemisphere than between the spring and autumn hemisphere. The time delay of sunrise (sunset) between magnetic conjugate points with a high dip latitude is a probable reason. Obvious latitude and local time variations of meridional correlation distance, latitude variations of zonal correlation distance, and altitude and local time variations of vertical correlation distance are detected. Furthermore, there are evident seasonal variations of meridional correlation distance at higher latitudes in the Northern Hemisphere and local time variations of zonal correlation distance at higher latitudes in the Southern Hemisphere. These variations can generally be interpreted by the variations of controlling factors, which may have different spatial scales. The influences of the occurrence of ionospheric storms could not be ignored. Further modeling and data analysis are needed to address this problem. We suggest that our results are useful in the specific modeling/forecasting of ionospheric variability and the constructing of a background covariance matrix in ionospheric data assimilation.
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6

Jacobson, A. R., R. Holzworth, E. Lay, M. Heavner, and D. A. Smith. "Low-frequency ionospheric sounding with Narrow Bipolar Event lightning radio emissions: regular variabilities and solar-X-ray responses." Annales Geophysicae 25, no. 10 (November 6, 2007): 2175–84. http://dx.doi.org/10.5194/angeo-25-2175-2007.

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Abstract. We present refinements of a method of ionospheric D-region sounding that makes opportunistic use of powerful (109–1011 W) broadband lightning radio emissions in the low-frequency (LF; 30–300 kHz) band. Such emissions are from "Narrow Bipolar Event" (NBE) lightning, and they are characterized by a narrow (10-μs), simple emission waveform. These pulses can be used to perform time-delay reflectometry (or "sounding") of the D-region underside, at an effective LF radiated power exceeding by orders-of-magnitude that from man-made sounders. We use this opportunistic sounder to retrieve instantaneous LF ionospheric-reflection height whenever a suitable lightning radio pulse from a located NBE is recorded. We show how to correct for three sources of "regular" variability, namely solar zenith angle, radio-propagation range, and radio-propagation azimuth. The residual median magnitude of the noise in reflection height, after applying the regression corrections for the three regular variabilities, is on the order of 1 km. This noise level allows us to retrieve the D-region-reflector-height variation with solar X-ray flux density for intensity levels at and above an M-1 flare. The instantaneous time response is limited by the occurrence rate of NBEs, and the noise level in the height determination is typically in the range ±1 km.
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Sridharan, S., S. Sathishkumar, and S. Gurubaran. "Variabilities of mesospheric tides and equatorial electrojet strength during major stratospheric warming events." Annales Geophysicae 27, no. 11 (November 4, 2009): 4125–30. http://dx.doi.org/10.5194/angeo-27-4125-2009.

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Abstract. The present study demonstrates the relationship between the high latitude northern hemispheric major sudden stratospheric warming (SSW) events and the reversal in the afternoon equatorial electrojet (EEJ), often called the counter-electrojet (CEJ), during the winter months of 1998–1999, 2001–2002, 2003–2004 and 2005–2006. As the EEJ current system is driven by tidal winds, an investigation of tidal variabilities in the MF radar observed zonal winds during the winters of 1998–1999 and 2005–2006 at 88 km over Tirunelveli, a site close to the magnetic equator, shows that there is an enhancement of semi-diurnal tidal amplitude during the days of a major SSW event and a suppression of the same immediately after the event. The significance of the present results lies in demonstrating the latitudinal coupling between the high latitude SSW phenomenon and the equatorial ionospheric current system with clear evidence for major SSW events influencing the day-to-day variability of the CEJ.
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8

Abdu, Mangalathayil A., Paulo A. B. Nogueira, Angela M. Santos, Jonas R. de Souza, Inez S. Batista, and Jose H. A. Sobral. "Impact of disturbance electric fields in the evening on prereversal vertical drift and spread F developments in the equatorial ionosphere." Annales Geophysicae 36, no. 2 (April 9, 2018): 609–20. http://dx.doi.org/10.5194/angeo-36-609-2018.

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Abstract. Equatorial plasma bubble/spread F irregularity occurrence can present large variability depending upon the intensity of the evening prereversal enhancement in the zonal electric field (PRE), that is, the F region vertical plasma drift, which basically drives the post-sunset irregularity development. Forcing from magnetospheric disturbances is an important source of modification and variability in the PRE vertical drift and of the associated bubble development. Although the roles of magnetospheric disturbance time penetration electric fields in the bubble irregularity development have been studied in the literature, many details regarding the nature of the interaction between the penetration electric fields and the PRE vertical drift still lack our understanding. In this paper we have analyzed data on F layer heights and vertical drifts obtained from digisondes operated in Brazil to investigate the connection between magnetic disturbances occurring during and preceding sunset and the consequent variabilities in the PRE vertical drift and associated equatorial spread F (ESF) development. The impact of the prompt penetration under-shielding eastward electric field and that of the over-shielding, and disturbance dynamo, westward electric field on the evolution of the evening PRE vertical drift and thereby on the ESF development are briefly examined. Keywords. Ionosphere (ionospheric irregularities)
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9

Pallam Raju, D., R. Sridharan, S. Gurubaran, and R. Raghavarao. "First results from ground-based daytime optical investigation of the development of the equatorial ionization anomaly." Annales Geophysicae 14, no. 2 (February 29, 1996): 238–45. http://dx.doi.org/10.1007/s00585-996-0238-9.

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Abstract. A meridional scanning OI 630.0-nm dayglow photometer was operated from Ahmedabad (17.2°N dip lat.) scanning a region towards the south in the upper atmosphere extending over ~5° in latitude from 10.2°N to 15.2°N dip latitude. From the spatial and temporal variabilities of the dayglow intensity in the scanning region we show for the first time, evidence for the passage of the crest of the equatorial ionization anomaly (EIA) in the daytime by means of a ground-based optical technique. The relationship between the daytime eastward electric field over the dip equator in the same longitude zone as inferred from the equatorial electrojet strength and the evolutionary pattern of EIA is clearly demonstrated. The latter as inferred from the dayglow measurements is shown to be consistent with our present understanding of the electrodynamical processes in the equatorial region. The present results reveal the potential of this ground-based optical technique for the investigation of ionospheric/thermospheric phenomena with unprecedented spatial and temporal resolution.
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10

Jayachandran, B., R. Balachandran Nair, N. Balan, and P. B. Rao. "Short term variabilities of ionospheric electron content (IEC) and peak electron density (NP) during solar cycles 20 and 21 for a low latitude station." Journal of Atmospheric and Terrestrial Physics 57, no. 13 (November 1995): 1599–609. http://dx.doi.org/10.1016/0021-9169(95)00087-i.

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Conference papers on the topic "Ionospheric variabilities"

1

Medvedeva, Irina V., and Konstantin Ratovsky. "Studying atmospheric and ionospheric variabilities associated with sudden stratospheric warmings." In 26th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics, edited by Gennadii G. Matvienko and Oleg A. Romanovskii. SPIE, 2020. http://dx.doi.org/10.1117/12.2575552.

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