We use STEREO data to study shocks driven by stream interactions and the waves associated with them. During the years of the extended solar minimum 2007-2010, stream interaction shocks have Mach numbers between 1.1-3.8 and θBn ∼20-86°. We find a variety of waves, including whistlers and low frequency fluctuations. Upstream whistler waves may be generated at the shock and upstream ultra low frequency (ULF) waves can be driven locally by ion instabilities. The downstream wave spectra can be formed by both, locally generated perturbations, and shock transmitted waves. We find that many quasiperpendicular shocks can be accompanied by ULF wave and ion foreshocks, which is in contrast to Earth's bow shock. Fluctuations downstream of quasi-parallel shocks tend to have larger amplitudes than waves downstream of quasi-perpendicular shocks. Proton foreshocks of shocks driven by stream interactions have extensions dr ≤0.05 AU. This is smaller than foreshock extensions for ICME driven shocks. The difference in foreshock extensions is related to the fact that ICME driven shocks are formed closer to the Sun and therefore begin to accelerate particles very early in their existence, while stream interaction shocks form at ∼1 AU and have been producing suprathermal particles for a shorter time.
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13 June 2013
SOLAR WIND 13: Proceedings of the Thirteenth International Solar Wind Conference
17–22 June 2012
Big Island, Hawaii
Research Article|
June 13 2013
STEREO interplanetary shocks and foreshocks
X. Blanco-Cano;
X. Blanco-Cano
Instituto de Geofísica, UNAM, CU, Coyoacán 04510 DF,
Mexico
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P. Kajdič;
P. Kajdič
IRAP-University of Toulouse, CNRS, Toulouse,
France
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E. Aguilar-Rodríguez;
E. Aguilar-Rodríguez
Instituto de Geofísica, UNAM, Morelia,
Mexico
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C. T. Russell;
C. T. Russell
ESS and IGPP, University of California, Los Angeles, 603 Charles Young Drive, Los Angeles, CA 90095,
USA
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L. K. Jian;
L. K. Jian
NASA Goddard Space Flight Center, Greenbelt, MD and University of Maryland, College Park, MD,
USA
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J. G. Luhmann
J. G. Luhmann
SSL, University of California Berkeley,
USA
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AIP Conf. Proc. 1539, 131–134 (2013)
Citation
X. Blanco-Cano, P. Kajdič, E. Aguilar-Rodríguez, C. T. Russell, L. K. Jian, J. G. Luhmann; STEREO interplanetary shocks and foreshocks. AIP Conf. Proc. 13 June 2013; 1539 (1): 131–134. https://doi.org/10.1063/1.4811005
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