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Probing shock geometry via the charge to mass ratio dependence of heavy ion spectra from multiple spacecraft observations of the 2013 November 4 event | | Lulu Zhao
; Gang Li
; G. M. Mason
; C. Cohen
; R. A. Mewaldt
; M. I. Desai
; R. W. Ebert
; M. A. Dayeh
; | | Date: |
12 Sep 2016 | | Abstract: | In large SEP events, ions can be accelerated at CME-driven shocks to very
high energies. Spectra of heavy ions in many large SEP events show features
such as roll-overs or spectral breaks. In some events when the spectra are
plotted in energy/nucleon they can be shifted relative to each other to make
the spectral breaks align. The amount of shift is charge-to-mass ratio (Q/A)
dependent and varies from event to event. This can be understood if the spectra
of heavy ions are organized by the diffusion coefficients (Cohen et al., 2005).
In the work of Li et al. (2009), the Q/A dependences of the scaling is related
to shock geometry when the CME-driven shock is close to the Sun. For events
where multiple in-situ spacecraft observations exist, one may expect that
different spacecraft are connected to different portions of the CME-driven
shock that have different shock geometries, therefore yielding different Q/A
dependence. In this work, we examine one SEP event which occurred on 2013
November 4. We study the Q/A dependence of the energy scaling for heavy ion
spectra using Helium, oxygen, and iron ions. Observations from STEREO-A,
STEREO-B and ACE are examined. We find that the scalings are different for
different spacecraft. We suggest that this is because ACE, STEREO-A and STEREO-
B are connected to different parts of the shock that have different shock
geometries. Our analysis indicates that studying the Q/A scaling of in-situ
particle spectra can serve as a powerful tool to remotely examine the shock
geometry for large SEP events. | | Source: | arXiv, 1609.9479 | | Services: | Forum | Review | PDF | Favorites | |
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