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  • Solar terrestrial relationship  (4)
  • electron density  (2)
  • 1
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    Analisi delle fluttuazioni geomagnetiche durante la tempesta di San Patrizio (2020)
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    Publication Date: 2020-10-02
    Description: Il lavoro presenta uno studio preliminare delle fluttuazioni del campo geomagnetico registrate a terra presso 50 osservatori magnetici dislocatiin tutto l’emisfero borealenel corso della tempesta di San Patriziodel marzo 2015. L’applicazione del metodo “Empirical Mode Decomposition”, che ben si adatta all’analisi di segnali frutto di processi non lineari e non stazionari,permette la separazione delle fluttuazioni su diversa scala temporale (breve, 〈200 min,e lunga, 〉200 min). Il differente contributo al segnale sorgente delle fluttuazioni brevi e lunghe, associate a diversi processi magnetosferici, è analizzato in funzione della latitudine nel corso della tempesta geomagnetica.
    Description: Unpublished
    Description: GSSI, L'Aquila
    Description: 1A. Geomagnetismo e Paleomagnetismo
    Keywords: Solar terrestrial relationship
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Oral presentation
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  • 2
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    “Characterization of the geomagnetic field fluctuations during St. Patrick’s Day Storm” (2020)
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    Publication Date: 2020-10-02
    Description: We present a preliminary study of the properties of the magnetic field’s fluctuations during the St. Patrick’s Day geomagnetic storm occurred on 17 March 2015. We analyse the minute values of the geomagnetic field recorded simultaneously by a latitudinal network of 18 geomagnetic observatories located at different latitudes, from the equatorial regions to the northern high-latitude ones. We apply the Empirical Mode Decomposition (EMD) method to the X (North) and Y (East) components of the geomagnetic field recorded during a period (13 - 30 March 2015) covering the whole duration of the storm. This adaptive method, which can be applied to signals originating from nonlinear and non-stationary processes, permits us to separate fast (𝜏〈200 min) and slow (𝜏〉200 min) magnetic fluctuations, which are related to different magnetospheric processes. Indeed, it has been shown that whilemagneticfluctuationsat long timescales (𝜏〉200 min) showa large degree of correlationbetween solar windparameters and magnetosphericdynamicsproxies, at short timescales(𝜏〈200 min)theyareessentially related to internal magnetospheric processes andseem to be notdirectlydriven by interplanetarychanges. The differentenergycontribution of the fast and slow fluctuationsisinvestigatedas a function of latitudeduring the development of theselectedgeomagneticstorm.The weight of the signal related to the fluctuations on a short time scale shows a dependence on the latitude and geomagnetic activity level.
    Description: Unpublished
    Description: Vienna, Austria
    Description: 1A. Geomagnetismo e Paleomagnetismo
    Keywords: Solar terrestrial relationship
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Oral presentation
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  • 3
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    “St. Patrick’s Day Storm: an analysis of the geomagnetic field fluctuations” (2020)
    Details
    Publication Date: 2020-10-02
    Description: We analyze minute values of ground-based geomagnetic fluctuations at about 50 observatories located at throughout the Northern Hemisphere during the St. Patrick's storm in March 2015. The application of the "Empirical Mode Decomposition" method, which is well suitable for the analysis of signals resulting from non-linear and non-stationary processes, it allows the separation of fluctuations on different time scales (short 〈 200 min, and long 〉 200 min). The different contribution to the source signal of short and long fluctuations, associated with different magnetospheric processes, is analyzed as a function of latitude during the geomagnetic storm. The weight of the signal related to the fluctuations on a short time scale shows a dependence on the latitude and geomagnetic activity level.
    Description: Published
    Description: Liegi, Belgio
    Description: 1A. Geomagnetismo e Paleomagnetismo
    Keywords: Solar terrestrial relationship
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 4
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    “Multi-scale nature of the high-latitude magnetic field fluctuations” (2020)
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    Publication Date: 2020-10-02
    Description: We analyze the properties of the geomagnetic field fluctuations during a period (13-30 March 2015) characterized by different geomagnetic activity levels including the strongest geomagnetic storm of XXIV solar cycle occurred on 17 March 2015. The one minute values of theX and Y componentsof the geomagnetic field recorded simultaneously in the Northern and Southern hemispheres are analyzed. The Empirical Mode Decomposition (EMD) method is applied to the selected dataset in order to separate short timescale (𝜏〈200 min) and long timescale(𝜏〉200 min) magnetic field fluctuations, which have been suggested to be related to different physical processes. It has been shown that while magnetic fluctuations at long timescales (𝜏〉200 min) show a large degree of correlation between solar wind parameters and magnetospheric dynamics proxies, at short timescales (𝜏〈200 min) they are essentially related to internal magnetospheric processes and seem to be not directly driven by interplanetary changes. Daily maps of the fast and slow magnetic field fluctuations during the selected period are analyzed to investigate the contributionsto the recorded magnetic signal related to the different magnetospheric processes and their dependence on the geomagnetic activity level. A comparison between the two hemispheres isalso shown.
    Description: Published
    Description: San Francisco
    Description: 1A. Geomagnetismo e Paleomagnetismo
    Keywords: Solar terrestrial relationship
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 5
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    High-latitude polar pattern of ionospheric electron density: Scaling features and IMF dependence (2021)
    Elsevier
    Details
    Publication Date: 2021-05-12
    Description: We investigated the average polar patterns of ionospheric electron density and the corresponding patterns of scaling features as a function of interplanetary magnetic field orientation. The focus is on the Northern Hemisphere using electron density data recorded on-board ESA Swarm A satellite. The first- and second-order scaling exponents have been evaluated by means of the -order structure functions. We used electron density measurements over a period of 15 months from April 1, 2014 to June 30, 2015, which corresponds to the maximum of solar cycle 24 and which is characterized by an average value of the solar radio flux (F10.7) index equal to (140+/- 30) sfu. Electron density, first- and second-order scaling exponents have been mapped and discussed for four main IMF orientations provided by Bx and By components under conditions of high solar activity. Large spatial changes of the second-order scaling exponent pattern are observed with a steepening of the associated spectral exponent in correspondence with the nightside polar cap trailing edge. Intermittency, defined as the departure from linearity of the dependence of scaling exponents on moment order q, is also evaluated finding that it is generally higher near the equatorward boundary of the auroral oval than elsewhere. On the whole, the found patterns of the electron density first- and second-order scaling exponents suggest the occurrence of turbulence at the high latitudes.
    Description: Published
    Description: 105531
    Description: 2A. Fisica dell'alta atmosfera
    Description: JCR Journal
    Keywords: Polar ionosphere ; Turbulence ; Scaling feature ; Space weather ; Swarm satellite ; electron density ; 01.02. Ionosphere ; 01.03. Magnetosphere
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 6
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    Characterising the electron density fluctuations in the high-latitude ionosphere at Swarm altitude in response to the geomagnetic activity (2019)
    Details
    Publication Date: 2020-03-05
    Description: The high-latitude ionosphere is characterised by plasma density irregularities with typical lengths in a wide range of scales (from ~1 m up to ~1000 km). The enhancement of these irregularities caused for instance by severe Space Weather conditions can affect trans-ionospheric communications between ground facilities and satellites. For this reason, an accurate characterisation of the dynamic properties of electron density and their variation with the geomagnetic activity level is of particular interest for the Space Weather especially at high latitudes. In this framework, taking advantage of high resolution in situ measurements by the recent ESA-Swarm space mission orbiting in the ionospheric F-layer, we study both the dynamical properties of the electron density and the scaling properties of the electron density fluctuations at high latitudes in the Northern and Southern Hemispheres in response to changes in the geomagnetic activity levels via nonlinear techniques involving the first-order structure functions. Indeed, it has been shown that the turbulent character of the ionospheric plasma density plays an important role in the generation and dynamics of ionospheric plasma density irregularities and the study of the scaling properties of the electron density fluctuations permits us to characterise the possible turbulent state of the ionospheric electron density. The obtained results are consistent with the turbulent character of the ionospheric dynamics, and with the presence of different turbulent regimes that show a dependence on the geomagnetic activity levels, magnetic latitude and MLT values.
    Description: Published
    Description: GM453
    Description: 2A. Fisica dell'alta atmosfera
    Description: JCR Journal
    Keywords: electron density ; turbulence ; 01.02. Ionosphere
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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