Electron Strahl Observations: Characteristics at Stream Interfaces

Details Electron Strahl Observations: Characteristics at Stream Interfaces Electron Strahl Observations: Characteristics at Stream Interfaces

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh13b1981s&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH13B-1981

Physics

[2102] Interplanetary Physics / Corotating Streams, [2164] Interplanetary Physics / Solar Wind Plasma, [2169] Interplanetary Physics / Solar Wind Sources, [2199] Interplanetary Physics / General Or Miscellaneous

Scientific paper

The beam-width of the suprathermal electron strahl varies with solar wind flow conditions. Generally, narrower strahls are found within high-speed streams than in slow wind. Using ACE SWEPAM, we investigate the strahl width within co-rotating interaction regions (CIRs) in order to determine if a systematic transition from broader to narrow strahl is evident across the imbedded stream interface. In particular, if flux transport occurs across a coronal hole boundary, then changes in electron strahl signatures might be offset in time from the stream interface. We find that the electron strahl width commonly shows a sharp transition at the leading edge stream interface within the CIR. Less commonly, the strahl width shows a transition within the CIR either preceding or following the stream interface. The stream interface was identified from both the solar wind flow and from the ACE SWICS ion charge state composition measurements. We infer that there is not continuous flux transport across the coronal hole boundary. However, we find evidence for sporadic flux transport across the boundary. To date we have investigated 27 ideal CIRs listed by Borovsky and Denton (2010). We will extend this study to include more CIR intervals. In addition we will investigate the variations of the strahl distribution across stream interfaces on the trailing edges of streams and contrast those with observations on the stream leading edges.

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