Publications for 31 st ICRC 2009 (Abstracts)

  • 1. Estimation of a quality of data from the cosmic ray stations incorporated into the NMDB.

    Belov A. {1}, Eroshenko E. {1}, Yanke V. {1}, Ibragimov A. {2}, and NMDB Consortium.

    {1} Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS (IZMIRAN), Moscow, Russia
    {2} University of Oulu, Oulu, Finland

    The continue monitoring of cosmic rays gives the main basis of experimental data for various studies of cosmic ray variations in the scientific and applied aspects. Thus, the questions of a detector stability and data quality are extremely important in this case. In the present work different independent and adding each other methods of data quality checking are elaborated and applied. The quantitative estimations are obtained with the retrospective data, and an attempt is done for data quality definition in real time code for the stations feeding the NMDB.

    • 2. Definition of cosmic ray density and anisotropy vector beyond the magnetosphere in real time mode.

      Asipenka A. {1}, Belov A. {1}, Eroshenko E. {1}, Ibragimov A. {2}, Oleneva V. {1}, Yanke V. {1}, Mavromichalaki H. {3}, Papaioannou A. {3}, Papailou M. {3}, Mariatos G. {3}, for the NMDB Team.

      {1} Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS (IZMIRAN), Moscow, Russia
      {2} University of Oulu, Oulu, Finland
      {3} Nuclear and Particle Physics Section, Physics Department, National and Kapodistrian University of Athens, Greece

      Experimentally, directly from the data of each station (each neutron monitor) we obtain variations of the secondary cosmic ray component which is generated by the primary particles in the Earth atmosphere. Our task is to get the cosmic ray variations in the space, beyond the Earth’s atmosphere and magnetosphere using data from the world wide NM network. This task is solved by means of the Global Survey Method (GSM) which is a complicated version of the spherical analysis method. In the frame of FP7 NMDB project this task has been solved in areal time mode. The program GSM012T was developed as modified version of the main GSM program to adjust it to real time calculations. The results are published in digit and graphical forms.

      • 3. The ALERT signal of ground level enhancements of solar cosmic rays: physics basis, the ways of realization and development.

        Belov A. {1}, Eroshenko E. {1}, Klepach E. {1}, Ibragimov A. {2}, Mavromichalaki H. {3}, Sarlanis C. {3}, Souvatsoglou G.{3}, Yanke V. {1}, Vashenyuk E. {4}, for the NMDB team.

        {1} Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS (IZMIRAN), Moscow, Russia
        {2} University of Oulu, Oulu, Finland
        {3} Nuclear and Particle Physics Section, Physics Department, National and Kapodistrian University of Athens, Greece
        {4} Polar Geophysical Institute, Apatity, Russia.

        Abstract. The system of ALERT signal generation based on the data of solar cosmic ray ground enhancement recorded by neutron monitor network is described. A strategy of the earliest producing of ALERT signal was studied using the retrospective experimental data since 1986 (X-Ray channel and solar protons >100 MeV from GOES, GLEs from neutron monitors). Only in two cases of 30 observed GLEs the system could not work out a plausible alert signal because of the small effect of enhancement; in all other events the ALERT from neutron monitor data was in average 20 minutes ahead of those producing from GOES channel (>100 MeV) data. This time is enough to estimate solar proton spectra by the neutron monitor data and make a prognosis of time profiles of protons >100 MeV just in the beginning of enhancement. The main steps of software for generation of GLE ALERT signal and possibilities of its improving are considered. The full description of the system is presented by the address: http://cr0.izmiran.ru/Alert/AlertGLE.htm

        • 4. Recording System MARS-06 for the Stations of Cosmic Rays

          Gvozdevsky B.{2}, Klepach E.{1}, Sarlanis Ch.{3}, Souvatsoglou G.{3}, Schepetov А.{4}, Yanke V.{1} for the NMDB Team.

          {1} Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS (IZMIRAN), Moscow, Russia
          {2} Polar Geophysical Institute, Apatity, Russia
          {3} Nuclear and Particle Physics Section, Physics Department, National and Kapodistrian University of Athens, Greece
          {4} Physical Institute RAS (FIAN), Moscow, Russia

          The system of data collection (MARS-06) is described which is elaborated on the serial producing controller Advantech PCI-1780. The system has the fast operability and is intended for working in the simple counting mode. This system is elaborated in the frame of FP7 program, NMDB project, under OS Windows and Linux to provide a real time feeding neutron monitor database with 1-minute resolution and updating. It is operating during a year already at the stations Athens, Moscow (experimental Mobil Laboratory), Almaty, Mirny (Antarctica), Irkutsk, Magadan. The system is improved for the wide using and its software package, needed for installation, is accessible at IZMIRAN site ftp://cr0.izmiran.rssi.ru/NMDB_doc/RegistrationSystems_MARS/(PCI-1780)/ and in NMDB site.

          • 5. Cosmic ray monitoring in real time at the Antarctic station Mirny

            Garbatsevich V., Klepach E., Osin A., Smirnov D., Tsibulya K., Yanke V.

            Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS (IZMIRAN), Moscow, Russia

            A description of the Antarctic station Mirny is presented which was modernized on the basis of modern electronic and with accounting of all requirements to the cosmic ray monitoring. The system of data collection, data processing, and satellite system of transferring of one-minute data are described. The estimation of data quality during the last period of three year observations is given. The station was modernized to incorporate its data to the NMDB.

            • 6. Asymptotic longitudinal distribution of cosmic ray variations in real time as the method of interplanetary space diagnostic

              Eroshenko E. {1}, Asipenka A.{1}, Belov A.{1}, Ibragimov A. {2}, Mavromichalaki H. {3}, Papailiou M. {3}, Papaioannou A.{3}, Oleneva V. {1}, Yanke V.{1} for the NMDB Team

              {1} Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS (IZMIRAN), Moscow, Russia
              {2} University of Oulu, Oulu, Finland
              {3} Nuclear and Particle Physics Section, Physics Department, National and Kapodistrian University of Athens, Greece

              Continuous ground level observations of cosmic rays give a chance to reveal the precursors of large interplanetary disturbances and geomagnetic storms. The picture of CR variation distribution by the asymptotic longitudes shows the characteristics features evidencing about an approach of interplanetary disturbance. These distributions can be pictured and studied using the ring station method which is realized in real time mode in the frame of e-Infrastructures project NMD in the Seventh Framework Programme. The Internet project is created for monitoring of such events.

              • 7. Search for the solar neutron events by the data from high mountain neutron monitors in real time mode

                Belov A. {1}, Eroshenko E. {1}, Yanke V. {1}, Zhang JiLong {3}, Nikolayevskiy N. {2}, Kryakunova O. {2}, for the NMDB team

                {1} Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS (IZMIRAN), Moscow region, Russia
                {2} Institute of Ionosphere of National Center of Space Research and Technologies, Almaty, Kazakhstan
                {3} Institute of High Energy Physics, Beijing, China

                In the frame of the Neutron Monitor Database (NMDB) project (www.nmdb.eu) the elaboration of the software which allows the monitoring of solar neutrons by the real time data from mountain stations is intended. The observation at the Earth of solar protons and direct relativistic solar neutrons, generated during powerful solar flares (in combination with X-ray and gamma-ray data) allows us to obtain unique information on the Sun’s flare process and particle acceleration mechanisms. The identification of the solar neutron enhancement is often difficult, since the galactic cosmic ray variations and solar proton enhancements can overlay them. In the present work the algorithm is proposed for identification of such events in real time and for estimation of reliability of its selection.

                • 8. On mid-term periodicities in cosmic rays: utilizing the NMDB archive.
                  K. Kudela {1}, R. Langer {1}, I. Strhárský {1}, H. Mavromichalaki {2}, A. Papaioannou {2}, M. Gerontidou {2} for NMDB team

                  {1}Institute of Experimental Physics, Slovak Academia of Science, Kosice, Slovakia
                  {2}Physics Department, University of Athens, Athens, Greece

                  The contribution of quasi-periodic variations of cosmic rays (QPs) for T > 27 days at the primary energies to which the neutron monitors (NM) are sensitive has rather complicated character. They were reported in several papers (e.g. [1-3] among others) from individual stations and for various time intervals covered. The archive of the data from several neutron monitor constructed within the NMDB project(www.nmdb.eu) involves now long time series of measurements at NMs situated at different geomagnetic cut-off rigiditiy positions and at different altitudes and it is updated continually. Using the daily averages of cosmic ray intensity at the stations within NMDB we (a) review the temporal evolution of selected quasiperiodicities, especially those of ~1.7 yr, ~1.3 yr and ~150 days respectively until 2008, (b) check the significance of other quasiperiodicities reported in earlier papers and (c) discuss the occurrence of QPs with those observed in solar, interplanetary and geomagnetic activity (e.g.[5,6])as well as in cosmic energetic particles below the atmospheric threshold [7].

                  • 9. Using the real-time Neutron Monitor Database to establish an Alert signal

                    Helen Mavromichalaki {1}, George Souvatzoglou {1}, Christos Sarlanis {1},George Mariatos {1}, Athanasios Papaioannou {1},Anatoly Belov {2}, Eugenia Eroshenko {2} and Victor Yanke {2} for the NMDB team

                    {1}Physics Department, University of Athens, Athens, Greece
                    {2}Institute of Terrestrial Magnetism, Ionosphere and Radio Propagation after Pushkov, Moscow, Russia

                    The European Commission is supporting the real-time database for high-resolution neutron monitor measurements (NMDB) as an e-Infrastructures project in the Seventh Framework Programme in the Capacities section. The realization of the NMDB will provide the opportunity for several applications most of which will be implemented in real-time. An important application will be the establishment of an Alert signal when dangerous solar particle events are heading to the Earth,resulting into a Ground Level Enhancement (GLE) registered by neutron monitors (NMs). The cosmic ray community has been occupied with the question of establishing such an Alert for many years and recently several groups succeed in creating a proper algorithm capable of detecting space weather threats in an off-line mode. A lot of original work has been done to this direction and every group working in this field performed routine runs for all GLE cases, resulting into statistical analyses of GLE events. The next step was to make this algorithm as accurate as possible and most importantly, working in real-time. This was achieved when, during the last GLE observed so far, a real-time GLE Alert signal was produced. In this work, the steps of this procedure as well as the functionality of this algorithm for both the scientific community and users are being discussed. Nevertheless, the transition of the Alert algorithm to the NMDB is also being discussed.

                    • 10. Properties of the extreme solar particle events of the cycles 22 and 23

                      Maria Andriopoulou {1}, Helen Mavromichalaki {1}, Christina Plainaki {2}, Anatoly Belov {3}, Eugenia Eroshenko {3}

                      {1} Physics Department, University of Athens, Athens, Greece
                      {2} IFSI-Istituto di Fisica dello Spazio Interplanetario, Roma, Italy
                      {3} IZMIRAN Russian Academy of Sciences after Puskov, Moscow, Russia

                      Ground level enhancements (GLEs) are short and sharp increases in the counting rates of cosmic ray intensity measured by neutron monitors. Studying these extreme solar particle events is of particular importance, since they are involved in a vast range of scientific applications. Such a case is the real time GLE alert system functioning in Athens neutron monitor station. In this work an effort to obtain and connect the main characteristics of the thirty one GLEs occurring during the last two solar cycles 22 and 23, is realized via statistical analysis. Despite the uniqueness of these events, characterized by specific solar and interplanetary conditions during the time period they took place, possible similarities of the GLE characteristics between different event cases may be evidence for the existence of common physical mechanisms. This analysis includes the calculation of the onset time and the determination of longitudinal and latitudinal distributions. One-minute and five-minute cosmic ray data provided from the worldwide network of neutron monitors as well as from the NMDB database (http://www.nmdb.eu) was used. The main properties of the analysed cases of GLEs are classified and some preliminary results are presented. The possibility to use them in space weather applications is discussed.

                      • 11. Near real-time determination of ionization and radiation dose rates induced by cosmic rays in the Earth's atmosphere – an NMDB application

                        R. Buetikofer and E.O. Flueckiger, for the NMDB team

                        Physikalisches Institut, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland

                        A real-time database for high resolution neutron monitor data is being developed within the Neutron Monitor Database (NMDB) project funded by the European Union's 7th Frame Work Programme (www.nmdb.eu). In addition to the database, NMDB project will provide different data products. One of these applications is the near real-time determination of ionization and radiation dose rates induced by cosmic rays in the Earth's atmosphere. The procedure of this application has four steps. In the first step, the near Earth cosmic ray flux outside the geomagnetosphere is computed based on NMDB. This flux is the basis for the next step, which is computing the cosmic ray flux at the top of the Earth's atmosphere for a 5 degree by 5 degree grid in geographic coordinates. In the third step, the secondary cosmic ray flux and the ionization of the atoms and molecules in the atmosphere at selected altitudes is processed with the Geant4 software package PLANETOCOSMICS. Finally, the radiation dose rates at typical aircraft altitude are evaluated for each grid point by published flux to dose conversion factors. The paper will present the procedure and will compare first computed radiation dose values with other theoretical and measured results.