1,502 research outputs found
Autoscala applied at the Ionospheric Station of Warsaw
No full textA new ionosonde VISRC2, built at the Space Research Center of Warsaw, Poland, was installed at Warsaw (52.2 N, 21.1 E) in march 2007. The main characteristics of this ionosonde are: transmitted power 10 kW, pulse duration 100 μs, sampling period 5 μs, frequency resolution 25 kHz, and capability to distinguish ordinary and extraordinary reflections.
This ionosonde, able to record the sounding only as a binary file, was not equipped with a tool to perform an automatic scaling of the recorded trace.
From October 2008 Autoscala (Pezzopane and Scotto, 2005, 2007, 2008; Scotto and Pezzopane, 2007) is routinely applied to the ionograms recorded by this ionosonde.Published1.7. Osservazioni di alta e media atmosfera3.9. Fisica della magnetosfera, ionosfera e meteorologia spazialeN/A or not JCRope
Estimation of probability of occurrence of F1 layer or L condition using tables and electron density profile models
No full textAn algorithm is proposed for evaluation of the probability of occurrence of an F1 layer or L condition, based on tables. Observations independent of the tables database are used for comparison between the estimated probability of occurrence, the formulation used at present in IRI, and the occurrence actually observed. The importance of the inclusion of L condition in the electron density profile model is shown.Published2053-20563.9. Fisica della magnetosfera, ionosfera e meteorologia spazialeJCR Journalreserve
Electron density profile calculation technique for Autoscala ionogram analysis
No full textAn electron density profile model with free parameters is introduced. Initially the parameters are calculated on the basis of the ionospheric characteristics automatically obtained from the ionograms by Autoscala and considering the helio-
geophysical conditions. The technique used to adjust the free parameters to the particular ionograms recorded is presented.Published756-7661.7. Osservazioni di alta e media atmosfera3.9. Fisica della magnetosfera, ionosfera e meteorologia spaziale5.4. Banche dati di geomagnetismo, aeronomia, clima e ambienteJCR Journalreserve
Sporadi-E layer and metereological activity
No full textObscrvations of Es laycr performed at the ionospheric observatory of Rome from 1982 to 1989 have been used to investigate a possible correlation with cold front passages. Such a correlation may exist because of the AGW excited by tropospheric activity at cold front passages. A relationship with thunderclouds electrostatic field is also marginally considered. The treatment of data shows that the distributions of the frequencies of renection at cold front passages present only small differences compared to normal days, both for the f and for the I type; therefore, a correlation between Es layer anù meteorological activity cannot be affirmed
A method for automatic scaling of F1 critical frequencies from ionograms
No full textThis work describes a method that has been developed to automatically assess
whether the F1 layer is present or not on an ionogram trace, and, if present, to scale the
F1 critical frequency foF1. The ionograms in which the information related to the F1 trace
is insufficient are identified and considered separately. In order to test the performance of
this method and the conditions in relation to which it could be improved, a data set of
ionograms recorded from September 2005 to June 2006 by the AIS-INGV ionosonde
installed at Rome was used. The values obtained automatically by Autoscala, with the
addition of this new F1 layer routine, were compared with those obtained by the standard
manual method.PublishedRS2S911.7. Osservazioni di alta e media atmosfera3.9. Fisica della magnetosfera, ionosfera e meteorologia spazialeJCR Journalreserve
Highlighting the F2 trace on an ionogram to improve Autoscala performance
No full textThis work describes a linear regression based method for highlighting the cuspidal trace on an ionogram. This method was initially thought to smooth out cases in which the autoscaling of the ionogram performed by Autoscala was erroneous because the F2 ordinary ray was identified as the extraordinary ray. Actually the development of this method turned out to also be very useful for filtering out noise and assisting the main algorithm of Autoscala to not be misled by multiple-hop sporadic E layer echoes. Applying the algorithm to different ionograms recorded by different ionosondes showed that the application of this method considerably improved the Autoscala performance. The role that this method plays in the light of existing algorithms is also discussed.Published1168-11771.7. Osservazioni di alta e media atmosfera3.9. Fisica della magnetosfera, ionosfera e meteorologia spazialeJCR Journalope
Le poème-médita(c)tion
No full textL'articolo si propone di indagare, attraverso la lettura di alcuni testi poetici e interviste ritenuti fondamentali, la poetica di André Velter, scrittore, viaggiatore, editore, poeta, evidenziando in essa un duplice movimento di uscita da sé e di ritorno a sé che l'erranza fisica e intellettuale favorisce. In essa ogni gesto mentale prelude ad un'azione che può anche rivelarsi, in un senso laicamente mistico, una sorta d'inazione che dell'azione riconosce l'inanità, ma non l'intento che l'ha determinata, il quale comunque modifica lo stato di partenza. In tal modo l'effusione dell'erranza tratteggia un percorso di conoscenza che è anche un esercizio di "dépense" convocante esperienze, presenze, un'intera e variegata comunità degli animi associata a un rito energetico di aggregazione fisica e intellettuale
A Spiritual Reaction to Islamic Prosperity: The Power of Sorrow in Riccoldo da Monte di Croce’s "Letters to the Triumphant Church"
No full textThis chapter tackles the argumentative strategies behind Riccoldo da Monte di Croce's "Epistole ad Ecclesiam Triumphantem" written in the aftermath of the Mamluk conquest of Saint John of Acre (1291), the last outpost of the Christian Kingdom of Jerusalem. I will linger on how the threatening presence of Muslims in the East allowed Riccoldo to develop a creative meditation on faith, a refined theological and rhetorical manifesto providing the author and his Christian readers with a spiritual shelter from the dramatic events taking place on earth. I am going to examine in particular Riccoldo’s experience of "sorrow"—one of the possible translations of the Latin word "tristicia"— by looking specifically at the ways in which he describes his faith in God. I will show how, on a rhetorical level, Riccoldo’s exegesis of the Book of Job through Gregory the Great turns out to be the exhortative backbone of the whole collection of his imaginary letters. Referring to Job, it has been claimed that the "Epistole" bear witness to the author’s spiritual crisis, particularly to his crisis of faith, as well as to his loss of certainty and hope in God’s plan—this implies an interpretation of the Book of Job in a deterministic, literalist and pessimistic fashion. I aim to challenge this interpretation of the "Epistole" as a desperate lament conceived by an author who finds himself incapable of escaping a fatalistic view of the present, realistically confused regarding God’s salvation plan and even suffering from agnosticism. I will demonstrate that by means of careful exegetical and rhetorical strategies, the "Epistole" instead provide substantial evidence of Riccoldo’s very faith vis-à-vis the general crisis surrounding him, shedding light on his expectations about the reaction of the Dominican Order—and the Western Church on a broader level—to the last stage of Islamic expansion
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