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Upstream events at a record distance of 0.3 AU from the bow-shock

This study examines the detection of proton upstream events at a record distance of 0.3 AU from Earth during slow solar wind and weak geomagnetic activity. Doubts arise regarding the origin of these events due to the favorable conditions.

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Upstream events at a record distance of 0.3 AU from the bow-shock

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  1. Upstreamevents at a record distance of 0.3 AU from the bow-shock A. Klassen, R. Müller-Mellin, R. Gomez-Herrero University of Kiel, Germany SEPT onboard STEREO-A detected strong upstream proton events at a distance of 0.29 AU from Earth. The events were observed during slow solar wind (280 km/s) and during weak geomagnetic activity (Kp < 1) on 13 and 14 September 2007. STEREO SWG#17, 13-14 November 2007, Caltech

  2. Dynamic spectrum of Upstream Events and “small” CIR SEPT_AntiSun SEPT_Sun

  3. Spacecraft position and magnetic field orientation during the upstream event on 13 Sept. 2007

  4. Spectra of upstream event on 13 September 2007 showing significant anisotropy SEPT_AntiSun SEPT_Sun;North;South

  5. Results • Detection of proton upstream events at STEREO-A on 13-14 September 2007 far away from Earth (0.29 AU), one day before CIR. • Upstream events were observed during slow solar wind Vsw= ~ 280 km/s and low geoactivity (Kp<1). • Similar upstream event was observed also on 13 October 2007 at STEREO-B at a distance of 0.3 AU from Earth. Question Are these upstream events really originating near Earth? Doubts arise because the events occur during slow solar wind and quiet geomagnetic conditions.

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