Three-dimensional He+ pick-up ion velocity distribution functions observed with STEREO-A PLASTIC

Open Access

Table 1.

Overview of the PUI relative velocity measures.

$w_{SW} = \frac{\| v_{PUI} \|}{\| v_{SW} \|}$ $w_{\mathrm{SW}} = \frac{\|\boldsymbol{v}_{\mathrm{PUI}}\|}{\|\boldsymbol{v}_{\mathrm{SW}}\|}$	$ϖ_{SW} = \frac{\| v_{PUI} - v_{SW} \|}{\| v_{SW} \|}$ $\varpi_{\mathrm{SW}} = \frac{\|\boldsymbol{v}_{\mathrm{PUI}} - \boldsymbol{v}_{\mathrm{SW}}\|}{\|\boldsymbol{v}_{\mathrm{SW}}\|}$	$ϖ_{SW, inj} = \frac{\| v_{PUI} - v_{SW} \|}{\| v_{SW} - v_{ISN} \|}$ $\varpi_{\mathrm{SW,inj}} = \frac{\|\boldsymbol{v}_{\mathrm{PUI}} - \boldsymbol{v}_{\mathrm{SW}}\|}{\|\boldsymbol{v}_{\mathrm{SW}} - \boldsymbol{v}_{\mathrm{ISN}}\|}$
Fresh PUIs are injected to w_SW ≃ 2.	Fresh PUIs are injected to ϖ_SW ≃ 1.	Fresh PUIs are injected to ϖ_SW, inj = 1.

Corresponds to concentric shells in	Corresponds to PUI energy with	Corresponds to the tentative pick-up
absolute energy space.	respect to the frame of transport.	point in velocity space.
Sensitive to orbital position-dependent	Sensitive to orbital position-	Accounts for v_ISN and is therefore
shift of velocity spectra.	dependent shift of velocity spectra.	not affected by velocity shift.

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