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Table 2 Characteristics of the selected flares

From: Role of hard X-ray emission in ionospheric D-layer disturbances during solar flares

Class Date (MM/DD/YYYY) SXR peak flare time [UT] SZA\(_\text{NRK}\) (deg) SZA\(_\text{GQD}\) (deg) SZA\(_\text{NSY}\) (deg)
C6.1 01/21/2017 11:08 79.21 73.08 63.25
C4.1 02/22/2017 13:27 67.51 63.82 58.68
C3.2 03/27/2017 11:12 56.67 50.44 40.55
M5.3 04/02/2017 08:02 73.91 68.30 59.14
M2.3 04/02/2017 13:00 52.05 48.15 43.12
C4.2 04/02/2017 15:08 59.95 60.05 61.46
C3.8 04/03/2017 08:14 71.98 66.22 56.83
C3.9 04/03/2017 11:13 53.85 47.63 37.79
C3.4 04/03/2017 13:06 51.81 48.10 43.45
C7.3 04/03/2017 13:24 52.36 49.21 45.55
M5.8 04/03/2017 14:28 56.09 55.00 54.66
C5.5 04/06/2017 12:10 50.49 45.28 37.72
C3.3 04/18/2017 09:41 56.21 49.73 39.13
C8.0 06/02/2017 17:57 67.23 72.29 80.94
M1.3 07/03/2017 16:14 51.98 55.09 61.24
C4.0 07/09/2017 09:12 50.49 44.62 35.25
C5.3 07/09/2017 12:09 34.97 29.60 22.39
C6.3 08/27/2017 15:16 56.70 57.39 59.83
C7.7 09/02/2017 15:41 61.59 62.89 66.09
C8.3 09/04/2017 12:25 49.93 45.18 38.60
M1.5 09/04/2017 15:30 61.08 62.05 64.77
M3.8 09/05/2017 06:40 82.91 78.56 71.41
C5.4 09/05/2017 10:19 56.35 49.79 39.10
C6.9 09/05/2017 13:34 51.90 49.26 46.51
C3.7 09/05/2017 16:18 67.21 69.44 73.88
C4.6 09/05/2017 17:15 74.47 77.93 84.10
M2.3 09/05/2017 17:43 78.24 82.25 89.18
X2.2 09/06/2017 09:10 63.72 57.37 46.98
X9.3 09/06/2017 12:02 50.94 45.64 37.88
M2.5 09/06/2017 15:56 64.79 66.43 70.04
M1.4 09/07/2017 09:54 59.30 52.74 41.99
X1.1(a) 09/07/2017 10:15 57.34 50.77 40.07
C3.0 09/07/2017 12:14 51.12 46.11 38.96
X1.3 09/07/2017 14:36 56.88 56.22 56.55
M8.1 09/08/2017 07:49 74.40 68.90 59.93
C5.9 09/08/2017 12:13 51.50 46.48 39.28
M2.9 09/08/2017 15:47 64.48 65.85 69.08
M3.7 09/09/2017 11:04 54.35 48.10 38.18
X8.2 09/10/2017 16:06 67.47 69.30 73.13
C3.0 09/12/2017 07:29 78.15 72.86 64.19
C8.1 07/02/2018 13:47 73.29 69.99 65.36
C4.6 10/02/2018 13:22 71.58 67.66 62.00
C4.6 03/30/2018 08:04 74.84 69.17 59.91
C5.0 01/26/2019 13:22 76.06 72.15 66.39
M1.1 05/29/2020 07:24 64.37 60.05 53.31
C9.3 05/29/2020 10:46 39.85 33.30 22.67
C3.5 10/16/2020 15:11 75.22 75.11 75.67
C4.3 10/29/2020 11:50 70.79 65.59 57.63
C3.8 11/26/2020 12:53 78.35 74.32 68.30
M4.4 11/29/2020 13:11 79.29 75.62 70.21
C4.0 12/14/2020 14:37 84.82 82.97 80.44
C4.3 04/22/2021 09:21 57.15 50.82 40.49
C3.7 04/22/2021 10:49 48.52 42.05 31.64
C4.0 05/09/2021 13:58 42.94 41.74 41.91
C3.2 05/22/2021 15:35 50.01 52.16 57.00
M1.1 05/22/2021 17:11 62.57 66.82 74.36
M1.1 05/23/2021 11:08 39.09 32.71 22.63
C3.0 05/28/2021 09:57 44.84 38.39 27.87
C3.7 06/09/2021 09:07 49.82 43.96 34.63
C3.6 06/30/2021 18:15 68.21 73.47 82.41
M2.7 07/03/2021 07:17 65.26 61.26 55.07
X1.5 07/03/2021 14:29 39.84 39.91 42.21
M1.0 07/03/2021 17:03 58.52 62.63 70.06
C6.0 07/09/2021 07:55 60.71 56.03 48.72
C7.0 07/09/2021 10:50 39.64 33.08 22.40
C4.7 07/09/2021 17:25 61.89 66.34 74.18
M1.0 10/26/2021 15:57 83.29 84.18 86.11
M1.4 10/28/2021 07:40 89.86 83.76 73.69
M2.0 10/28/2021 10:28 73.57 67.26 57.13
X1.0 10/28/2021 15:35 81.56 81.87 82.94
  1. The three first columns indicate the flare class, the date of occurrence and the peak time as seen in the SXR spectrum. The three last columns indicate the solar zenith angle (SZA) at the reflection point from NSY , GQD, and NRK, respectively.
  2. aThe GOES flare list indicates an M7.3 while the peak flux of this event is \(1.1\times 10^{-4}\)W/m\(^2\). Thus, we label this event as an X1.1