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  • 1
    Electronic Resource
    Electronic Resource
    Congenital pulmonary steal associated with Tetralogy of Fallot, right aortic arch and an isolated left carotid artery (1989)
    Springer
    Pediatric radiology 19 (1989), S. 449-451 
    Details
    ISSN: 1432-1998
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02387653
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Can an impulsive variation of the solar wind plasma pressure trigger a plasma bubble? A case study based on CSES, SWARM and THEMIS data. (2021)
    In:  Advances in Space Research
    Details
    Publication Date: 2021-01-22
    Description: During the August 25, 2018 geomagnetic storm, the new borne CSES-01 satellite and the Swarm A satellite detected a really large equatorial plasma bubble (EPB) in the post-midnight sector over western Africa. We investigated the features of this deep ionospheric plasma depletion using data from the Langmuir probes on-board CSES-01 and Swarm A satellites, and data from the high-precision magnetometer and the electric field detector instruments on-board CSES-01. Using also plasma and magnetic field data from THEMIS-E satellite we found that, during the passage of the magnetic cloud that drove the geomagnetic storm, an impulsive variation lasting about ten minutes characterized the solar wind (SW) pressure. The analysis of the delay time, between the occurrence of such impulsive variation and the detection of the plasma bubble, suggests a possible link between the SW pressure impulsive variation as identified by THEMIS-E and the generation of the EPB as detected by CSES-01 and Swarm A. We put forward the hypothesis that the SW pressure impulsive variation might have triggered an eastward prompt penetrating electric field that propagated from high to equatorial latitudes, overlapping in the nightside region to the zonal westward electric field, causing either a reduction or an inversion, at the base of the EPB triggering.
    Language: English
    Type: info:eu-repo/semantics/article
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    GFZ OAI
  • 3
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    Modelling of the topside ionosphere effective plasma scale height through CSES-01 satellite in-situ electron density observations (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-09-18
    Description: The topside ionosphere embraces the region extending from the F2-layer electron density peak to the overlying plasmasphere. In this work, we aim at characterizing the effective plasma scale height (H0) above the F2-layer peak using in-situ electron density (Ne) observations by Langmuir Probes (LPs) on the China Seismo-Electromagnetic Satellite (CSES-01). The International Reference Ionosphere (IRI) model and COSMIC-1 radio occultation measurements provide additional information. CSES-01 is a sun-synchronous satellite with an orbital inclination of 97.4° and an altitude of ~500 km, with descending and ascending nodes at ~14:00 local time (LT) and ~02:00 LT, respectively. Calibrated CSES-01 LPs Ne data from 2019-2021 provide information in the topside ionosphere, whereas IRI provides the Ne values at the F2-layer peak (NmF2) for the same time, latitude, and longitude sounded by CSES-01; COSMIC-1 data are instead used to infer the vertical gradient of the effective plasma scale height in the topside ionosphere. The two Ne set of values are used as anchor points to infer H0 by assuming a linear scale height in the topside representation given by the NeQuick model. By exploiting the CSES-01 dataset for the years 2019-2021 we deduced the global behavior of H0 for daytime (~14:00 LT) and nighttime (~02:00 LT) conditions, different seasons, and for low solar activity conditions. Results from CSES-01 observations are compared and validated with those from COSMIC-1 radio occultation and Swarm B satellite measurements, for similar diurnal, seasonal, and solar activity conditions.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 4
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    Observational evidence for buffeting-induced kink waves in solar magnetic elements (2015)
    Details
    Publication Date: 2020-11-26
    Description: The role of diffuse photospheric magnetic elements in the energy budget of the upper layers of the Sun’s atmosphere has been the recent subject of many studies. This was made possible by the availability of high temporal and spatial resolution observations of the solar photosphere, allowing large numbers of magnetic elements to be tracked to study their dynamics. In this work we exploit a long temporal series of seeing-free magnetograms of the solar photosphere to study the effect of the turbulent convection on the excitation of kink oscillations in magnetic elements. We make use of the empirical mode decomposition technique in order to study the transverse oscillations of several magnetic flux tubes. This technique permits analysis of non-stationary time series like those associated to the horizontal velocities of these flux tubes, which are continuously advected and dispersed by granular flows. Our primary findings reveal the excitation of low frequency modes of kink oscillations, which are subharmonics of a fundamental mode with a 7.6 ± 0.2 min periodicity. These results constitute observational proof of the excitation of kink waves by the buffeting of the convection cells in the solar photosphere, and they are discussed in light of their possible role in the energy budget of the upper Sun’s atmosphere.
    Description: Published
    Description: A102
    Description: 1A. Geomagnetismo e Paleomagnetismo
    Description: JCR Journal
    Description: restricted
    Keywords: Sun: photosphere ; Sun: magnetic fields ; Sun: oscillations ; 01. Atmosphere::01.03. Magnetosphere::01.03.05. Solar variability and solar wind
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 5
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    20 March 2015 solar eclipse influence on sporadic E layer (2015)
    Elsevier Science Limited
    Details
    Publication Date: 2021-06-07
    Description: This paper shows how the solar eclipse occurred on 20 March 2015 influenced the sporadic E (Es) layer as recorded by the Advanced Ionospheric Sounder by Istituto Nazionale di Geofisica e Vulcanologia (AIS-INGV) ionosondes installed at Rome (41.8°N, 12.5°E) and Gibilmanna (37.9°N, 14.0°E), Italy. In these locations, the solar eclipse was only partial, with the maximum area of the solar disk obscured by the Moon equal to ~54% at Rome and ~45% at Gibilmanna. Nevertheless, it is shown that the strong thermal gradients that usually accompany a solar eclipse, have significantly influenced the Es phenomenology. Specifically, the solar eclipse did not affect the Es layer in terms of its maximum intensity, which is comparable with that of the previous and next day, but rather in terms of its persistence. In fact, both at Rome and Gibilmanna, contrary to what typically happens in March, the Es layer around the solar eclipse time is always present. On the other hand, this persistence is also confirmed by the application of the height–time–intensity (HTI) technique. A detailed analysis of isoheight ionogram plots suggests that traveling ionospheric disturbances (TIDs) likely caused by gravity wave (GW) propagation have played a significant role in causing the persistence of the Es layer.
    Description: Published
    Description: 2064–2072
    Description: 1A. Geomagnetismo e Paleomagnetismo
    Description: 2A. Fisica dell'alta atmosfera
    Description: 1IT. Reti di monitoraggio e Osservazioni
    Description: JCR Journal
    Description: restricted
    Keywords: Mid-latitude ionosphere ; E sporadic layer ; Solar eclipse ; Gravity wave ; Height–time–intensity technique ; 01. Atmosphere::01.02. Ionosphere::01.02.99. General or miscellaneous ; 01. Atmosphere::01.02. Ionosphere::01.02.04. Plasma Physics ; 01. Atmosphere::01.02. Ionosphere::01.02.05. Wave propagation ; 01. Atmosphere::01.02. Ionosphere::01.02.06. Instruments and techniques ; 05. General::05.07. Space and Planetary sciences::05.07.01. Solar-terrestrial interaction
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 6
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    The magnetometers and the geomagnetic data from GEOSTAR, a deep seafloor multidisciplinary observatory (2007)
    Details
    Publication Date: 2017-04-04
    Description: GEOSTAR, an European-funded project, is based on a submarine multidisciplinary observatory, that gathered geophysical and geochemical data during a period of six months, from September 2000 to March 2001, in its first deep seafloor mission (about 2000 m depth), off the coast of Ustica Island (Sicily, Italy). GEOSTAR was equipped with several scientific instrumentations, among them two magnetometers. Total intensity of the Earth’s magnetic field and its vectorial components were recorded by means of a scalar magnetometer (Overhauser type) and a suspended three axial fluxgate magnetometer, the latter being designed and built at the Istituto Nazionale di Geofisica e Vulcanologia laboratories. The adverse conditions of an environment located at 2000 m under the sea surface, obliged the making of a special design for the whole frame, including the use of non-magnetic materials for the structure, and the installation of two opposite expanding arms that contained the magnetometers. The geomagnetic experiment was completed by carrying out two fundamental procedures: the instrumental calibration and the computation of the vectorial magnetometer orientation with respect to the geographical reference, both are described in this paper. We also illustrate some properties of the complete magnetic data set, together with a spectral analysis performed in a particular condition of planetary magnetic activity, as well as applications aimed at extracting information about the crustal electric conductivity from the magnetic data in the area around Ustica Island.
    Description: Published
    Description: 105-114
    Description: open
    Keywords: geomagnetic ; GEOSTAR, ; 01. Atmosphere::01.01. Atmosphere::01.01.08. Instruments and techniques
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 7
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    Systematic Magnetic Observations in Italy (2007)
    INSTITUTE OF GEOPHYSICS POLISH ACADEMY OF SCIENCES
    Details
    Publication Date: 2017-04-04
    Description: Istituto Nazionale di Geofisica e Vulcanologia (INGV) is responsible for systematic magnetic observations in Italy made in observatories and repeat stations. At present, two regularly working geomagnetic observatories cover central and northern Italy: L’Aquila (the main Italian observatory since 1958) and Castello Tesino (since 1964). A new observatory is, at the moment, being installed in the southern Mediterranean (near Sicily) at Lampedusa Island. Once this installation is successfully completed, the three observatories will be able to provide a full coverage of the whole Italian latitudinal extension. A network of magnetic repeat stations is regularly distributed across Italy and measurements in some locations have been made for more than a century. Since the end of the 1970’s, INGV has been developing a modern repeat station network used for the compilation of the Italian magnetic maps. The most recent survey was made between 2004 and 2005 using L’Aquila Observatory as reference.
    Description: Published
    Description: 209-216
    Description: 1.6. Osservazioni di geomagnetismo
    Description: N/A or not JCR
    Description: open
    Keywords: Magnetic observatories ; magnetic network ; 04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 8
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    A Local Intermittency Measure (LIM) approach to the detection of geomagnetic jerks (2008)
    Elsevier
    Details
    Publication Date: 2017-04-04
    Description: In the present work we investigate the temporal distributions of the geomagnetic jerks occurring in the last three decades of the 20th century using a new method of analysis based on the wavelet transform: the Local Intermittency Measure (LIM). This method, which allows us to single out intermittent structures within a given time series, was applied to geomagnetic monthly means time series of the eastward magnetic field component (Y) of 44 worldwide observatories. We study the bimodal distribution of the jerk occurrence in time for the 1978 and 1991 events and point out a local/regional jerk in South Africa and in the Pacific Ocean which happened around 1986. The worldwide character of the 1999 geomagnetic jerk is also investigated integrating the LIM analysis with the traditional straight-line fit.
    Description: Published
    Description: 261-272
    Description: 3.4. Geomagnetismo
    Description: JCR Journal
    Description: reserved
    Keywords: geomagnetic jerk ; Local Intermittency Measure ; geomagnetic secular variation ; wavelet analysis ; 04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 9
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    Geomagnetic jerks: observation and theoretical modeling (2008)
    SAIt
    Details
    Publication Date: 2017-04-04
    Description: A geomagnetic jerk is a phenomenon involving the geomagnetic field secular variation when it abruptly changes its slope. It is generally accepted that it occurs on timescales from months to a few years and is of internal Earth origin. It has been suggested that geomagnetic jerks may represent a reorganization of the secular variation and that they may be created by torsional oscillations in the Earth’s core. For their peculiar characteristics geomagnetic jerks have been associated to di erent geophysical phenomena of global relevance. Here is presented a brief review of published results on the possible correlations with LOD and Chandler wobble decadal variations and global temperature changes.
    Description: Published
    Description: 957-960
    Description: 3.4. Geomagnetismo
    Description: N/A or not JCR
    Description: open
    Keywords: Geomagnetic Jerk ; LOD ; Chandler wobble ; Global temperature ; 04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 10
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    The contribution of geomagnetic observatories and magnetic models to the study of secular variation and jerks in Antarctica (2007)
    USGS
    Details
    Publication Date: 2017-04-04
    Description: Some of the most interesting features of the geomagnetic field and its time variations are displayed in polar areas. Observatory monthly means usually provide an excellent opportunity to study the temporal changes of the magnetic field at a given location. Unfortunately, on the Antarctic continent the distribution of the permanent ground- based observatories does not permit a uniform coverage of the examined area. Furthermore, the magnetic records are characterized by intense external disturbances and noise that make the analysis of the magnetic field difficult. To improve our knowledge of the secular variation and detect the presence of secular variation impulses (geomagnetic jerks) in Antarctica, we use both observatory data and the CM4 quiet time magnetic field model. In particular CM4 improves our knowledge of geomagnetic jerks over Antarctica through the study of the sign changes of the secular acceleration maps.
    Description: Published
    Description: on line only
    Description: 3.4. Geomagnetismo
    Description: N/A or not JCR
    Description: open
    Keywords: the geomagnetic field and its time variations ; secular variation and geomagnetic jerks in Antarctica ; geomagnetic observatories ; sign changes of the secular acceleration maps ; 04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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