Fig. 1.


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Interplanetary parameters and coupling functions for the 2007 CIR-HSS event: (a) solar wind speed; (b) southward component of the interplanetary magnetic field Bz, (c) epsilon parameter; (d) universal coupling function; (e) Kan-Lee electric field. Joule heating estimated for the northern hemisphere is shown in panel (f). Daily thermospheric cooling fluxes computed from height-integrated NO emission profiles averaged in seven latitude bins corresponding to the central geographic latitudes of 5.5°, 16.5°, 38.5°, 49.5°, 60.5°, 71.5°, and 83.5° are shown in panel (g) for the northern hemisphere. The same parameters for the latitude bins corresponding to the central geographic latitudes of −83.5°, −71.5°, −60.5°, −49.5°, −38.5°, −16.5°, and −5.5° in the southern hemisphere are shown in panel (h). Panel (i) shows daily-averaged global cooling powers for NO and CO2. Electron hemispheric power, HPe (black dots) with standard deviation values (red bounding lines) from inter-calibrated NOAA POES and DMSP measurements are shown in panel (j). Panels (k) and (l) show pressure-corrected SYM-H and AE indices, correspondingly. Vertical dashed lines indicate sample times during: pre-event background (~00:00 UT on 24 January, snapshot a), the storm main phase (~7:10 UT on 29 January, snapshot b; ~14:00 UT and 15:00 UT on 29 January, snapshots c and d), and recovery phase (~4:50 on 31 January, snapshot e). Snapshot numbering is shown in panel a. See text for details.

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