Athens Neutron Monitor Data Processing Center – ANMODAP Center

Mavromichalaki, H.; Gerontidou, M.; Mariatos, G.; Papailiou, M.; Papaioannou, Athanasios; Plainaki, C.; Sarlanis, C.; Souvatzoglou, G.

doi:10.1016/j.asr.2009.02.018

Cited by 8 publications

(7 citation statements)

References 65 publications

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“…In ANMODAP Center network initially participated 23 NM stations while now these stations have been increased to 34. Data from the network are gathered in real time along with satellite observations from the Advanced Composition Explorer (ACE) and the Geostationary Operational Environmental Satellite (GOES) [23].…”

Section: Data and Analysismentioning

confidence: 99%

On the link between atmospheric cloud parameters and cosmic rays

Christodoulakis

Varotsos

Mavromichalaki

et al. 2019

Journal of Atmospheric and Solar-Terrestrial Physics

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We herewith attempt to investigate the cosmic rays behavior regarding the scaling features of their time series. Our analysis is based on cosmic ray observations made at four neutron monitor stations in Athens (Greece), Jung (Switzerland) and Oulu (Finland), for the period 2000 to early 2017. Each of these datasets was analyzed by using the Detrended Fluctuation Analysis (DFA) and Multifractal Detrended Fluctuation Analysis (MF-DFA) in order to investigate intrinsic properties, like self-similarity and the spectrum of singularities. The main result obtained is that the cosmic rays time series at all the neutron monitor stations exhibit positive long-range correlations (of 1/f type) with multifractal behavior. On the other hand, we try to investigate the possible existence of similar scaling features in the time series of other meteorological parameters which are closely associated with the cosmic rays, such as parameters describing physical properties of clouds.

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Section: Data and Analysismentioning

confidence: 99%

On the link between atmospheric cloud parameters and cosmic rays

Christodoulakis

Varotsos

Mavromichalaki

et al. 2019

Journal of Atmospheric and Solar-Terrestrial Physics

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“…Cosmic ray measurements in Athens initiated in November 2000 with a standard super 6NM-64 neutron monitor (Mavromichalaki et al, 2009). Athens NM data are available in the on-line database at: http://cosray.phys.uoa.gr.…”

Section: Data Selectionmentioning

confidence: 99%

Mapping of the cosmic ray events related to the solar activity for the period 2003-2005

Papaioannou¹,

Makrantoni²,

Mavromichalaki³

2010

Preprint

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The relationship between cosmic ray intensity decreases and solar events is still an open field of space research. In this work a complete study of solar events occurred from January 2003 to December 2005, is considered. This three-years time period characterized by an unexpected activity of the Sun was divided into 27-day intervals starting from BR 2313 (06.01.2003) to 2353 (21.12.2005), generating diagrams of the cosmic ray intensity data recorded at the Athens Neutron Monitor Station. This station is working at an altitude of 260m and cut-off rigidity 8.53GV provided to the Internet high-resolution data in real-time. A mapping of all available solar and interplanetary events, such as solar flares with importance M and X, coronal mass ejections (Halo and Partial) was done. As we are going down from the solar maximum to the declining phase of the 23rd solar cycle, a statistical overview of the corresponding relationship among these phenomena, the significant percentage of the connection of Halo CMEs and solar flares and the respective connection to Forbush decreases on yearly and monthly basis are discussed. The close association, as well as a probable quantitative analysis, between solar events is being denoted. The role of extreme solar events occurred in October / November 2003 and January 2005 is also discussed. Obtained results may be useful for predictions of transient solar events and space weather forecasting.

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“…Below follows a detailed description of the relevant interplanetary disturbances during the aforementioned decreases along with the longitude-time distribution of cosmic ray variation diagrams. The asymptotic longitude distribution of cosmic ray variations observed by different stations is presented in Figures 2,3,4,and 6. In these figures the vertical axis corresponds to the asymptotic longitude of the stations and the horizontal axis refers to the time as DD.HH in UT.…”

Section: Resultsmentioning

confidence: 99%

“…).Πίνακας 1 4. Πίνακας αντιστοιχίας γεωµαγνητικών µεταβολών (nT) στον δείκτη K.Γενικά, παρατηρητήρια µε µεγαλύτερο πλάτος χρειάζονται µεγαλύτερο εύρος γεωµαγνητικής διαταραχής για τον ίδιο δείκτη Κ(Λουκάς, 2009).…”

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“…) η µακρόχρονη αξιοπιστία τους (η οποία εγγυάται µεγάλες χρονοσειρές δεδοµένων) και η αυτόµατη απόκτηση των δεδοµένων(Mavromichalaki et al, 2009a;2011; http://www.nmdb.eu). ε) το γεγονός ότι είναι τοποθετηµένοι στο έδαφος, το οποίο καθιστά σχετικά εύκολη και οικονοµική τη συντήρηση καθώς και την αναβάθµιση των συστηµάτων τους Τα µέρη ενός µετρητή νετρονίων είναι τα ακόλουθα (http://www.nmdb.eu): α) αναλογικός µετρητής νετρονίων (gas -filled proportional counter), β) επιβραδυντής νετρονίων (moderator), γ) παραγωγός σωµατίων (lead producer) και δ) ανακλαστήρας (reflector) σωµατίων (Σχ.3.3).…”

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Προειδοποιήσεις Γεωμαγνητικών Διαταραχών Και Ανθρώπινες Φυσιολογικές Παράμετροι

Papailiou¹,

Παπαηλιού²

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Over the last few years, the pre-decreases or pre-increases of the cosmic-ray intensity observed before a Forbush decrease, called the precursor effect and registered by the worldwide neutron monitor network, have been investigated for different cases of intense events. The Forbush decreases presented in this particular study were chosen from a list of events that occurred in the time period 1967 -2006 and were characterized by an enhanced first harmonic of cosmic-ray anisotropy prior to the interplanetary disturbance arrival. The asymptotic longitudinal cosmic-ray distribution diagrams for the events under consideration were studied using the "Ring of Stations" method, and data on solar flares, solar-wind speed, geomagnetic indices, and interplanetary magnetic field were analyzed in detail. The results revealed that the use of this method allowed the selection of a large number of events with well-defined precursors, which could be separated into at least three categories, according to duration and longitudinal zone. Finally, this analysis showed that the first harmonic of cosmic-ray anisotropy could serve as an adequate tool in the search for precursors and could also be evidence for them.

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Athens Neutron Monitor Data Processing Center – ANMODAP Center

Cited by 8 publications

References 65 publications

On the link between atmospheric cloud parameters and cosmic rays

On the link between atmospheric cloud parameters and cosmic rays

Mapping of the cosmic ray events related to the solar activity for the period 2003-2005

Προειδοποιήσεις Γεωμαγνητικών Διαταραχών Και Ανθρώπινες Φυσιολογικές Παράμετροι

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