Shock aurora is scientifically interesting because it results from a very specific driving impulse in the solar wind. While primary effects appear on the dayside of the Earth, this paper documents nightside signatures, which are rare and difficult to detect. The information gained is useful in understanding the magnetospheric mechanisms involved in the generation of shock aurora.  This paper is a clear presentation of relevant observations including some newly-discovered phenomena. I believe it will be a valuable contribution to the literature.  I have only a few minor technical/grammatical comments:

line 7: "lag" instead of "lags"

line 18: "Solar wind conditions are one of the most crucial parameters...".  Suggest "...among the most crucial..."  (since "conditions" is plural and inconsistent with "one of".)

line 86: "Only photometer observations with a narrow and zonal field of view".  Suggest you remove "and"; I believe you mean a FOV which is narrow in the zonal direction, i.e. a narrow zonal FoV. 

line 150: "initially appeared aurora":  suggest "aurora which appeared initially"

line 289: "stational folding":  not sure what's meant here.  Do you mean spatial folding?

This paper examines a shock aurora event on 26 February 2023 in northern Scandinavia, marking the first time such nightside auroral features have been captured by ground-based cameras. Using high-resolution all-sky imagery and magnetometer data, the study identifies three distinct auroral forms—a pre-existing green arc, a red diffuse aurora, and a secondary discrete arc exhibiting unique leaping and vortex-like motions. These observations are correlated with geomagnetic sudden commencement and field-aligned current signatures, offering new insights into solar wind interactions with the nightside ionosphere. The manuscript is well written and is recommended for prompt publication after minor suggested changes.

Apart from the suggestions from Reviewer 1, I recommend that the authors provide an introduction to ionospheric equivalent currents, as these are crucial for the analyses in Figures 5 and 6. An explanation of how equivalent currents relate to field-aligned currents (in terms of strength and direction, for example) would enhance the clarity of the discussion.

A minor question on Figure 1: the negative Bz and sudden increase in Pdyn appear roughly 50 minutes before the SC, as shown in the H component. Does this time difference arise from the solar wind’s propagation from L1 to Earth? Normally, a propagation algorithm is used to remove for that delay.