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2 edition of Variations of ionospheric electron content during disturbances found in the catalog.

Variations of ionospheric electron content during disturbances

Yeh, K. C.

Variations of ionospheric electron content during disturbances

  • 148 Want to read
  • 34 Currently reading

Published by Electrical Engineering Research Laboratory, Engineering Experiment Station, University of Illinois in Urbana .
Written in English

    Subjects:
  • Ionosphere -- Observations.,
  • Electrons.

  • Edition Notes

    Bibliography: leaf 9.

    Statementby K.C. Yeh [and] Henry Chow. NsG-24-59. Sponsored by: National Aeronautics and Space Administration.
    ContributionsChow, Henry, 1938- joint author.
    Classifications
    LC ClassificationsQC879 .Y4
    The Physical Object
    Pagination9 l.
    ID Numbers
    Open LibraryOL221449M
    LC Control Numbera 62009401

    The study of the impact of ionospheric disturbances on the conditions of functioning of satellite communication and navigation systems and the development of methods to reduce this effect requires the development of methods for evaluating the parameters of ionospheric disturbances and their spatial and temporal distribution. Studies show that electron concentration disturbances, which can Author: Boris Gavrilov, Yuriy Poklad, Iliya Ryakhovskiy. The ionospheric total electron content (TEC) is a vital pa- how severe the storm is and the variation changes from storm to storm. The disturbance field which is represented performances during disturbed ionospheric conditions due to the geomagnetic storms in order to verify the prediction potentials of such models.


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Variations of ionospheric electron content during disturbances by Yeh, K. C. Download PDF EPUB FB2

This paper studies the ionospheric response Variations of ionospheric electron content during disturbances book the major geomagnetic storm of October 18–19, Variations of total electron content during geomagnetic disturbances: A model/observation comparison The TIE‐GCM results show a good agreement with the GPS‐GIM in terms of simulating storm‐time TEC disturbances over the polar by: About Cookies, including instructions on how to turn off cookies if you wish to do so.

By continuing to browse this site you agree to us using cookies as described in. Our results suggest that these factors play an important role in the overall ionospheric modification during the solar eclipse. Eclipse‐Induced Ionospheric Disturbances.

Figure 3 presents a keogram image of differential TEC derived using the perturbation analysis technique described earlier. In this keogram, differential TEC values were averaged over the latitude range of 38°N to 41°N Cited by: The calculations carried out in the present paper for the daytime ionosphere show that for identical variations of the vertical ion velocity at large ionospheric heights, the effects of internal gravity waves and electric fields are very much alike with respect to variation in total electron content but produce quite different parameter variations of the F2 maximum.

These disturbances can be detected by monitoring the ionosphere using Total Electron Content obtained from Global Positioning System (GPS-TEC). In this study, the temporal analysis of these disturbances due to the seasonal variability is carried out for a mid-latitude GPS network using Ionosphere Research Laboratory TEC (IONOLAB-TEC) over : Secil Karatay.

Ionospheric total electron content (TEC) variations estimated from dual-frequency receivers of global positioning systems (GPS) can be used as a tool to detect possible seismo-ionospheric. The TEC variation mainly reflects the electron density changes near the ionospheric pierce point (IPP) which is the intersection of the LOS and a single layer (it is assumed that all the electrons are concentrated in an infinitely-thin layer at the altitude of about km above the Earth's surface).Cited by: 9.

For the purpose of determining the frequency of such rapid ionospheric disturbances observed at the Helheim, we processed 10 days before and 10 days after DOYand found that such rapid ionospheric variations do not happen every : Dong-Hyo Sohn, Kwan-Dong Park, James L.

Davis, Meredith Nettles, Pedro Elósegui. The main volume of Variations of ionospheric electron content during disturbances book about the structure and dynamics of ionospheric disturbances during the transionospheric sounding by GPS signals is contained in the variations of the "oblique'' total electron content I s (t), found from the results of measuring the phase delay of GPS signals using two working frequencies: f 1 = MHz and f.

[4] In this paper, we present global ionospheric electric fields simulated by the coupled magnetosphere ionosphere thermosphere (CMIT ) model during the April 2–5,storm.

This model can self‐consistently calculate global ionospheric electric fields of magnetospheric origin, the neutral wind dynamo, the disturbance dynamo and Cited by:   [22] Afraimovich et al. investigated an unusual class of MSTIDs of the nonwave type, isolated ionospheric disturbances (IIDs) that manifest themselves in TEC variations in the form of single aperiodic negative TEC disturbances with a duration of about 10 min (the total electron content spikes, TECS).

Amplitude of TEC perturbation due to IIDs is Cited by: The more common irregular variations are sporadic E, sudden ionospheric disturbances, and ionospheric storms.

SPORADIC E. - Irregular cloud-like patches of unusually high ionization, called sporadic E, often form at heights near the normal E layer. In this paper the analysis of the ionospheric total electron content (TEC) variations obtained with using GPS measurements before the Hokkaido earthquake (M = ) is presented.

Abstract The focus of the paper is the ionospheric disturbances during sudden stratospheric warming (SSW) events in the Arctic region. This study examines the ionospheric behavior during 12 SSW events, which occurred in the Northern Hemisphere overbased on vertical sounding data from DPS-4 ionosonde located in Norilsk (°E, °N).

It is of great significance for the global navigation satellite system (GNSS) service to detect the polar ionospheric total electron content (TEC) and its variations, particularly under disturbed ionosphere conditions, including different phases of solar activity, the polar day and night alternation, the Weddell Sea anomaly (WSA) as well as geomagnetic : Hui Xi, Hu Jiang, Jiachun An, Zemin Wang, Xueyong Xu, Houxuan Yan, Can Feng.

Since late s, the satellite radio tomography method has been employed to study the ionospheric electron density structure.

Austen et al. (, ) first proposed the ionospheric tomography technique and measured the ionospheric total electron content (TEC) along the line of sight (LOS) from naval navigational satellite system (NNSS) to the ground-based by:   Anthony J. Mannucci, Bruce T. Tsurutani, in Extreme Events in Geospace, 5 Conclusions and Future Outlook.

The largest increases in ionospheric electron density and total electron content during intense geomagnetic storms are due to prompt penetration electric fields (PPEF), that tend to occur during the storm main phase, and can last for several hours.

[1] This paper presents a statistical study of the pre‐earthquake ionospheric anomaly by using the total electron content (TEC) data from the global ionosphere map.

A total of M ≥ earthquakes in the global area during – are selected. The anomaly day is first defined. Then the occurrence rates of abnormal days for both the days within 1–21 days prior to the earthquakes Cited by: The GPS-derived total electron content (TEC) and NmF2 are measured at the Chung-Li ionosonde station (°N, °E) in order to study the variations in slab thickness (τ) of the ionosphere at low-latitudes ionosphere during –, corresponding to half of the 23rd solar study presents the diurnal, seasonal, and solar flux variations in τ for different solar by: Comparison of simultaneous variations of the ionospheric total electron content and geomagnetic field associated with strong Available via license: CC BY Content may be subject.

Increased observations of the ionosphere with the ionosondes, both top-side and bottom-side, before, during and after the strong earthquakes suggest that there are several disturbances and variations in the ionosphere especially in the critical frequency, ion temperatures and Total Electron Content (TEC) by: 4.

Abstract. We investigate an unusual class of medium-scale traveling ionospheric disturbances of the nonwave type, isolated ionospheric disturbances (IIDs) that manifest themselves in total electron content (TEC) variations in the form of single aperiodic negative TEC disturbances of a duration of about 10min (the total electron content spikes, TECS).

BEHAVIOUR OF ELECTRON CONTENT IN THE IONOSPHERIC D-REGION DURING SOLAR X-RAY FLARES M. Todorovic Drakul1, V. Cade•z• 2, J. Baj•cetic3, L. Popovic• 2, D. Blagojevic1 and A. Nina4 1Department of Geodesy and Geoinformatics, Faculty of Civil Engineering, University of Belgrade, Bulevar kralja Aleksan Belgrade, Serbia.

Variation in natural short-period ionospheric noise, and acoustic and gravity waves revealed by the amplitude analysis of a VLF radio signal on the occasion of the Kraljevo earthquake (Mw=). This paper reports on the first investigation of travelling ionospheric disturbances (TIDs) over mid-latitude South Africa.

Using Global Positioning System (GPS)-derived total electron content (TEC) variations from the South African network of dual frequency GPS receivers, we were able to examine the effects of the disturbance on the quiet-time. This book is aimed at professional scientists, engineers and students who need an intermediate-level reference and/or text.

Students of aeronomy and radio wave propagation are introduced to basic wave theory in absorbing, anisotropic and dispersive media and to the physics of production, loss, and movement of plasma in the ionosphere presence of the geomagnetic field. Ionosphere and magnetosphere - Ionosphere and magnetosphere - Ionospheric variations: The ionosphere is variable in space and time.

Some of the changes are chemical in origin and can be readily understood on the basis of the general considerations outlined above. There is a systematic variation, for example, according to the time of day. In early morning the Sun is relatively low in the sky.

Global Positioning System (GPS) data recorded in Southern California were used to compute ionospheric electron content time series for several days. Total electron content of the ionosphere during the geomagnetic storm on 10 Januarys, 61, pp.

– CrossRef Google Scholar Mannucci et al. ().Cited by: 1. Recent ionospheric observations report anomalous total electron content (TEC) deviations prior strong earthquakes. We discuss common fetures of the pre-earthquake TEC disturbances on the basis of statistics covering 50 strong seismic events during The F2-layer ionospheric plasma drift under action of the electric fields of seismic origin is proposed as the main reason of producing Cited by: The long-term trend in the electron density of the ionospheric F layer may be natural, not man-made.

Source: Journal of Geophysical Research: Space Physics By Kalman J. Knizhnik 22 September   Abstract. Due to the complex spatial distribution and variation of the ionospheric layer, it is difficult to separate or remove each anomaly.

The ionosphere has regular variations (daily and seasonal scales) and anomalies due to the magnetic storm, solar flares, and Author: Shuanggen Jin, Shuanggen Jin, R. Jin, X. Liu. A Sudden Ionospheric Disturbance results from an increased ionization density in the D layer caused by a solar flare or possibly by a GRB.

During a solar flare, the sunlit side of the Earth is hit by hard X-rays and UV radiation. They will penetrate to the D-layer and increase the ionisation process and the electron. Basic properties of the mid-latitude large-scale traveling ionospheric disturbances (LS TIDs) during the maximum phase of a strong magnetic storm of April are shown.

Total electron content (TEC) variations were studied by using data from GPS receivers located in Russia and Central Asia. All the details of ionospheric disturbances following the Tohoku Earthquake were first revealed by the high-resolution GPS total electron content observation in Japan.

The initial ionospheric disturbance appeared as sudden depletions following small impulsive TEC enhancements ~7 minutes after the earthquake onset, near the epicenter.

Then, concentric waves appeared to Cited by: Acoustic and gravity waves are the two main mechanisms by which energy produced by geophysical events at the Earth’s surface can propagate in the atmosphere [].The coupling of these atmospheric waves with the ionospheric electron density [] produces deviations in TEC from the dominant diurnal ing ionospheric disturbances (TIDs) are the ionospheric manifestation of these Author: Giorgio Savastano, Michela Ravanelli.

The positive storm is a regional-scale condition of the ionosphere occurring during geomagnetic disturbances during which plasma densities are driven above values normally observed during quiescent periods [Buonsanto, ].

New imaging techniques have provided regional and global-scale maps of the storm time variation of ionospheric density Cited by: Ionospheric earthquake effects detection based on Total Electron Content (TEC) GPS Correlation. Bambang Sunardi 1, Buldan Muslim 2, Andi Eka Sakya 1, Supriyanto Rohadi 1, Sulastri 1 and Jaya Murjaya 1.

Published under licence by IOP Publishing Ltd IOP Conference Series: Earth and Environmental Science, Volumeconference 1Cited by: 2. Here we aim to make initial steps toward an empirical model for ionospheric perturbations related to space weather events that are observable in the total electron content (TEC).

The perturbation TEC forecast model will be a fast and robust approach, improving TEC forecasts based on climatological models during storm conditions.

@article{osti_, title = {Ionospheric total electron content measurements from Turkey during the solar eclipse of 29 April }, author = {Artac, E. and Tulunay, Y.K.}, abstractNote = {Total ionospheric electron content (TEC) has been determined from the measurements of the Faraday rotation of a plane polarized wave that have been returned from the geostationary satellite ATS 6.

The dynamics of equatorial patch formation, motion, and decay are also discussed. Generation of irregularities during underdense heating was observed for the first time. Total electron content data have been utilized to derive the statistics of the variability of ionospheric time delay in the Mediterranean region for the current solar maximum.Abstract: A number of papers have reported on anomalous variation in ionospheric foF2 parameter and/or ionospheric total electron content (ITEC) in the vicinity of earthquake’s epicenter few days prior to the earthquake.

In this work empirical dependency for the seismo-ionospheric disturbances. The nighttime traveling ionospheric disturbances (TIDs) and the F -region 3-m scale field-aligned irregularities were simultaneously observed with the MU radar and GEONET, a GPS network, during the FRONT (F-region Radio and Optical measurement of the Nighttime TID) campaign periods in May and August The vertical profile of electron density detected by the Cited by: