scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Statistical tests for possible solar particle detection with the Mexico City neutron monitor Vargas Bernardo , Valdés-Galicia José Francisco Instituto de Geofísica, Universidad Nacional Autónoma de México We performed a search for ground level enhancements in the 5 minute data of the Mexico City neutron monitor from 1989 to 2006. We used Daubechies filters to renormalize the data, and then applied Student's test in search of signicant increases which could correspond to solar particle signals. Of the 31 events which occured in that time span, we found signicant signals for eight of them. Due to the high cutoff rigidity of the site (8.28 GV) and mean response energy of the instrument (25 GeV), these results provide evidence of the acceleration of high energy particles by eruptive phenomena in the solar atmosphere; they may also help to establish an upper bound for the particle acceleration power of the Sun.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Transmission the influence of solar wind to middle atmosphere and troposphere via high-latitudinal ionospheric potential pattern Tonev Peter , Velinov Peter Institute for Solar-Terrestrial Influences, Bulgarian Academy of Sciences Space weather influences the earth's atmosphere in different ways. One way of mapping of such influences down to the middle atmosphere and below is due to the field-aligned currents which are generated in the magnetosphere by the solar wind and are determined by the IMF. These currents determine the electric potential pattern in the ionosphere in both polar caps, where a potential difference of magnitude 40-160 kV (80-100 kV in average) is formed between the dawn and dusk sides. Because of that, while the ionospheric potential at geomagnetic (gm) latitudes below about 600 remains uniform (~250 kV with respect to the ground), at higher gm latitudes it is modified by up to ±80 kV. Because of the large horizontal scale of the trans-polar potential difference (~3000 km), the fair-weather currents which flow from the ionosphere to the ground in the global atmospheric electrical circuit at polar and high latitudes are modified, and this modification spreads downward to the surface. We evaluate theoretically the relative variations of the currents flowing in the global electrical circuit, as a function of altitude, gm coordinates, and gm local time, depending on IMF carried by the solar wind. For this goal we create a 3D numerical steady-state model based on the continuity equation for the electric current density. The dawn-to-dusk difference, as well as the pattern of the ionospheric potential distribution, which are related to specific IMF parameters, are evaluated by the Weimer model. A relatively simple global model of the atmospheric conductivity is used. We examine by our model the role of different factors in the formation of the electric currents and related electric fields which are superimposed to the global atmospheric electrical circuit at different gm locations and altitudes and under different conditions - these factors concern the solar wind and the atmospheric conductivity and their variations. Our study can be important in estimation of the ways of transmission of space weather influence to the Earth's atmosphere.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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