Despiking of energetic proton flux to study galactic cosmic ray modulation

Details Despiking of energetic proton flux to study galactic cosmic ray modulation Despiking of energetic proton flux to study galactic cosmic ray modulation

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh21b1925z&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH21B-1925

Astronomy and Astrophysics

Astrophysics

[7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles, [7536] Solar Physics, Astrophysics, And Astronomy / Solar Activity Cycle

Scientific paper

The solar influence on Galactic cosmic ray (GCR) flux can be generally described as the usually stable "background" modulation. The violent Solar Energetic Particle (SEP) events associated with solar activities can cause surging particle flux. Thus, the GCR flux observation from satellites may be heavily contaminated by spurious spikes due to SEPs. And spike may also arise in the long time series count rates data provided by ground-based neutron monitors, e.g., system glitch. To obtain the "pure" background GCR flux for modulation research, the removal of multifarious spikes is necessary. In this article, we present a robust automatic despiking algorithm based on Poincare map thresholding method to "purify" time-series GCR flux. The algorithm is effective and robust for detecting various types of spikes in the GCR count rates of neutron monitors. In addition, after despiking spacecraft observations of relatively lower energy energetic proton flux using our algorithm, we get both 11-year and 27-day period cycles comparable to the much higher energy GCR count rate data from the ground-based neutron monitors.

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