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Friday, July 24, 2020 | History

2 edition of Observations of large scale ionospheric irregularities as deduced from satellite information found in the catalog.

Observations of large scale ionospheric irregularities as deduced from satellite information

by George E. Chisholm

  • 354 Want to read
  • 6 Currently reading

Published by Pennsylvania State University .
Written in English

    Subjects:
  • Physics

  • ID Numbers
    Open LibraryOL25167526M

    The results of a rocket experiment carried out in the mid‐latitude, nighttime ionosphere revealed an isolated plasma density depletion between and km. A substantial enhancement of intensit.   In specific, to measure ionospheric irregularities in a more consistent and reliable way, instead of considering TEC time series, we preferred to use the rate of TEC (ROT = ΔTEC/Δt, Δt = 1 min) time series, which are better suited to highlight small-scale variations of TEC superimposed on a slower and large-scale trend.

      We report magnetic field observations of the components transverse to the main field in the frequency range 1–25 Hz from times of equatorial plasma irregularity crossings. These field variations are interpreted as Alfvénic signatures accompanying intermediate-scale ( m–4 km) plasma density depletions. Data utilized are the high-resolution CHAMP magnetic field measurements sampled at Unfortunately, scales of ionospheric irregularities range widely from tens of meters to tens of kilometers [25–27]. In this case, the lower bound (so-called inner scale) of the ionospheric turbulent spectrum may be less than the Fresnel radius which varies with the elevation angle in the – m range (see, e.g.,).

      The mapped ionospheric flows are an order of magnitude slower than the irregular flows at POLAR. b) the changes in magnetic field direction at POLAR did correlate very well with the required field stresses needed to move the flux tubes through the resistive ionosphere, so the effects of the ionospheric flow changes are seen at POLAR. The Sciences and Exploration Directorate is the largest Earth and space science research organization in the world. Its scientists advance understanding of the Earth and its life-sustaining environment, the Sun, the solar system, and the wider universe beyond. The Directorate is part of Goddard Space Flight Center (GSFC) in Greenbelt, Maryland.


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Observations of large scale ionospheric irregularities as deduced from satellite information by George E. Chisholm Download PDF EPUB FB2

Introduction [2] The transequatorial propagation (TEP) of HF radio waves has been used to detect large‐scale equatorial ionospheric irregularities. HF waves are sometimes received in the off–great circle directions.

Röttger used the HF TEP between Lindau, Germany, and Tsumeb, Namibia, to detect large‐scale wave structures propagating eastward in the by: 6. Observations of large scale ionospheric irregularities as.

Large-scale ionospheric irregularities, which occurred on September 8,were detected by the ionosonde and the Global Navigation Satellite System (GNSS) receiver network in this letter.

Since TPD values cover a range of – km, it is practically impossible to resolve large‐scale ionospheric structures with size above km. However, as we show, the radio occultation technique provides a novel and very useful way to study medium‐ and small‐scale irregularities where little research has been done so by: 9.

Journal of Atmospheric and Terrestrial Physics,Vol. 31, pp. Pergamon Press. Printed in Northern Ireland Observations of travelling ionospheric disturbances using stationary satellites T.

ELKINS and F. SLACK Air Force Cambridge Research Laboratories, Bedford, Massachusetts (Bedewed 3 June ; in revised/arm 26 September ) Abstractbservations, at a sub-auroral Cited by:   The Ionospheric Dynamics Exploration and Attitude Subsystem Satellite (IDEASSat/ INSPIRESat-2) is a three-unit (U) CubeSat developed with the objective of providing in-situ measurements of the Earth’s ionosphere in order to quantify both global scale ionospheric variability and small scale irregularities.

Two main types of the observed TEC disturbance were found: large-scale (LS) min variations with an amplitude of about –1 TECU and medium-scale (MS) min variations with an amplitude of.

Jaeheung Park's 41 research works with citations and 2, reads, including: Ionospheric plasma density oscillation related to EMIC Pc1 waves. Features of highly structured equatorial plasma irregularities deduced from CHAMP observations C. Xiong 1,2, H. Luhr¨ 1, S. Ma 2, C. Stolle 3, and B.

Fejer 4. In the post-sunset tropical ionospheric F-region plasma density often exhibits depletions, which are usually called equatorial plasma bubbles (EPBs). In this paper we give an overview of the Swarm Level 2 Ionospheric Bubble Index (IBI), which is a standard scientific data of the Swarm mission.

This product called L2-IBI is generated from magnetic field and plasma observations onboard Swarm. The lateral scale of an ionospheric disturbance stimulated by a high-power radio wave and the velocity of its west-to-east propagation along the geomagnetic latitude were 30–60 km and –   The ionosphere is a part of the upper atmosphere that is a threat to GNSS and satellite telecommunication systems.

In this chapter, we will dive into the GNSS real-time monitoring of ionospheric irregularities and TEC perturbations, with a focus on the detection of small- and medium-scale traveling ionospheric disturbances (TIDs) for natural hazard applications. Earth Planets Space, 65, –, The Ionospheric Bubble Index deduced from magnetic field and plasma observations onboard Swarm Jaeheung Park1, Max Noja1, Claudia Stolle2∗, and Hermann Luhr¨ 1 1Helmholtz-Centre Potsdam, GFZ German Research Center for Geosciences, SectionTelegrafenberg, D Potsdam, Germany.

Observations of large scale ionospheric irregularities as deduced from satellite information. By George E. Chisholm. Get PDF (3 MB). Few methods have been developed to analyze spatial patterns and the behavior of ionospheric plasma irregularities based on GNSS data. First, GIMs can be employed for this purpose.

Space (°) and time (1–2 h) resolution of GIMs allows the detection of large-scale ionospheric irregularities only (Perevalova et al., ; Jakowski et al. In this study, we investigated the scale sizes of equatorial plasma irregularities (EPIs) using measurements from the Swarm satellites during its early mission and final constellation phases.

We found that with longitudinal separation between Swarm satellites larger than °, no significant correlation was found any more. This result suggests that EPI structures include plasma density scale.

Ionospheric scintillation is a significant component of space-weather studies and serves as an estimate for the level of perturbation in the satellite radio wave signal caused due to small-scale ionospheric irregularities.

B-spline functions are used on the GPS ground based data collected during the year – for modeling high- and mid-latitude ionospheric scintillation.

A. Saito, M. Nishimura, M. Yamamoto, S. Fukao, T. Tsugawa, Y. Otsuka, S. Miyazaki, M.C. Kelley, Observations of traveling ionospheric disturbances and 3-m scale irregularities in the nighttime \(F\)-region ionosphere with the MU radar and a.

Five global positioning system (GPS) ground‐based receivers are specifically designed to observe large‐scale ionospheric variations over the geomagnetic equatorial, equatorial anomaly crest, and midlatitude regions.

Two‐dimensional images of ionospheric total electron content (TEC) during the two eclipse periods are constructed. Key ionospheric parameters are the peak electron density NmF2 and the corresponding height hmF2.

The peak density NmF2 is related to the ionosonde-measured critical frequency foF2 by the relation NmF2 = × (foF2) 2 in SI units. The CHAMP/IRO experiment provides global information on NmF2; the lack of global coverage is one of the major deficiencies of the ground-based observations.

Using three radio techniques for determining the spatial and terminal distribution of the electron concentration in the ionospheric F region, a number of parameters of medium-scale travelling ionospheric disturbances (the effective thickness of the atmospheric waveguide and height of its axis, spatial and time periods, propagation speeds, and maximum amplitudes of the disturbances) are .1.

The new ionospheric index accounts for latitudinal dependence of the ionospheric response to external and internal low latitude dynamics. 2. It was provided in a regional map format covering South America. 3. The Global Navigation Satellite System (GNSS) database used in the present work comprised files from receivers in South America.

1.Efforts to forecast the strength and latitudinal extent of scintillations on VHF and higher frequency trans-ionospheric radio signals recorded in low-latitude regions require a knowledge of the evolution of the spectrum of ionospheric irregularities in the intermediate scale range (~ m - few km), and dynamics of the irregularities.

At present, the 3-D models that have been developed to.