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We show that the energy-weighted angular (zenith, azimuth) distribution ofextensive air showers (EAS), produced by Ultra High Energy (UHE) cosmic rays atthe Pierre Auger Observatory (PAO), has a thrust axis almost transverse to theinterplanetary magnetic field (IMF), with a thrust value $Tp \geq 0.64$ ( where1.0 means a perfect alignment and 0.5 isotropy). This behavior stronglysuggests an effect of the IMF on the charged shower particles, producingadditional lateral scattering. We discuss the weakening of the Earth's magneticfield during geomagnetic storms (30\% of observational time) when the IMFbecomes preponderant, strengthening the alignment.

Alignment of air showers produced by ultra-high energy cosmic rays at the Pierre Auger Observatory