Effects of solar flares on the ionosphere as shown by the dynamics of ionograms recorded in Europe and South Africa

Barta, Veronika; Sátori, Gabriella; Berényi, Kitti Alexandra; Kis, Árpád; Williams, Earle

doi:https://doi.org/10.5194/angeo-37-747-2019

Articles | Volume 37, issue 4

https://doi.org/10.5194/angeo-37-747-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

Vertical coupling in the atmosphere–ionosphere system

https://doi.org/10.5194/angeo-37-747-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 37, issue 4

Regular paper

|

23 Aug 2019

Regular paper |

| 23 Aug 2019

Effects of solar flares on the ionosphere as shown by the dynamics of ionograms recorded in Europe and South Africa

Veronika Barta, Gabriella Sátori, Kitti Alexandra Berényi, Árpád Kis, and Earle Williams

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Final revised paper (published on 23 Aug 2019)
Preprint (discussion started on 28 Jan 2019)

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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RC1: 'Comments on manuscript “Investigation of the ionospheric absorption response to flare events during the solar cycle 23 as seen by European and South African ionosondes”', Anonymous Referee #1, 19 Feb 2019
- AC1: 'Response to reviewer 1.', Veronika Barta, 18 Apr 2019
RC2: 'Comments on the manuscript Angeo-2019-14', Anonymous Referee #2, 09 Mar 2019
- AC2: 'Response to reviewer 2.', Veronika Barta, 18 Apr 2019

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

ED: Publish subject to revisions (further review by editor and referees) (06 May 2019) by Christina Arras

AR by Veronika Barta on behalf of the Authors (19 May 2019) Author's response Manuscript

ED: Referee Nomination & Report Request started (21 May 2019) by Christina Arras

RR by Anonymous Referee #1 (19 Jun 2019)

RR by Anonymous Referee #2 (19 Jun 2019)

Suggestions for revision or reasons for rejection

Comments on the manuscript
Angeo-2019-14

‘Investigation of the ionospheric absorption response to flare events during the solar cycle 23 as seen by
European and South African ionosondes’’

Submitted to
Annales Geophysicae
By
Veronika Bartaet al.

General Comments:
The paper had significant improvements. The English, the figures and also the physical discussions were included and improved. It is an important work with good results. However, I still have few questions and suggestions before the publication. After the authors improve this part, I recommend for publishing.

Comments:
1. Introduction: The authors commented on Sripathi et al 2013 work (lines 20-22). The strong Es layers that occurred before of the solar flare were due to the wind shear mechanism presence during the Counter Electrojet (CEJ) event. Therefore, the Es layers occurrence does not related to the flare event. The CEJ event that is related to the solar flare, and in turn, the blanketing Es layers occurred in equatorial regions. Please, consider to explain with more details about this work or remove this discussion.
2. The authors need to explain Figure 1 with more detail. I did not understand the black line in the figure. I imagine it to be the fmim parameter. Authors need to better to define this parameter in the manuscript since it is using a general criterion. I would also like to have a more little discussion regarding the differences in the equatorial region and mid-latitudes in relation to the blackout events that occurred in this day.
3. Discussion: Line 27-30 -First paragraph is very confusing after the modifications.
4. Li et al is missing is missing an end point (page 13).

Referee Report: PDF

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ED: Publish subject to minor revisions (review by editor) (19 Jun 2019) by Christina Arras

AR by Veronika Barta on behalf of the Authors (09 Jul 2019) Author's response Manuscript

ED: Publish as is (22 Jul 2019) by Christina Arras

AR by Veronika Barta on behalf of the Authors (29 Jul 2019) Manuscript

Short summary

The solar flare effects on ionosphere at midlatitudes and low latitudes were investigated with the systematic analysis of ionospheric parameters derived from ionograms (total radio fade-out, f_min, df_min: deviation from the reference days). The duration of the total fade-out varied with the solar zenith angle. Furthermore, a solar-zenith-angle-dependent enhancement of the f_min and df_min parameters was detected but the observed values also depended on the flare intensity.