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Forbush Decreases Associated with Western Solar Sources and Geomagnetic Storms: A Study on Precursors

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Abstract

As suggested in many studies the pre-increases or pre-decreases of the cosmic ray intensity (known as precursors), which usually precede a Forbush decrease, could serve as a useful tool for studying space weather effects. The events in this study were chosen based on two criteria. Firstly, the heliolongitude of the solar flare associated with each cosmic ray intensity decrease was in the 50° –70°W sector and, secondly, the values of the geomagnetic activity index, Kp max, were ≥ 5. Twenty five events were selected from 1967 to 2006. We have used data on solar flares, solar wind speed, geomagnetic indices (Kp and Dst), and interplanetary magnetic field in our detailed analysis. The asymptotic longitudinal cosmic ray distribution diagrams were plotted using the “Ring of Stations” method for all the events. The results reveal clear signs of precursors in 60 % of selected events.

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Acknowledgements

The authors thank all the data providers of the NMDB stations. This work is partly supported by Russian FBR grants 11-02-01478, Program No. 22 BR of the Presidium RAS “Fundamental processes of research and development of the Solar System”.

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Authors and Affiliations

  1. Nuclear and Particle Physics Section, Physics Department, National and Kapodistrian University of Athens, Zografos, 15784, Athens, Greece

    M. Papailiou & H. Mavromichalaki

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

    M. Abunina, A. Belov, E. Eroshenko & V. Yanke

  3. Institute of Ionosphere, Kamenskoe Plato, Almaty, 050020, Kazakhstan

    O. Kryakunova

Authors
  1. M. Papailiou
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  2. H. Mavromichalaki
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  3. M. Abunina
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  4. A. Belov
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  5. E. Eroshenko
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  6. V. Yanke
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  7. O. Kryakunova
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Correspondence to H. Mavromichalaki.

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Papailiou, M., Mavromichalaki, H., Abunina, M. et al. Forbush Decreases Associated with Western Solar Sources and Geomagnetic Storms: A Study on Precursors. Sol Phys 283, 557–563 (2013). https://doi.org/10.1007/s11207-013-0231-x

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  • DOI: https://doi.org/10.1007/s11207-013-0231-x

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