Monthly Sunspot Observation Report
April 2021 Sunspot classification and coordinates →
29.82
Monthly mean R
17 / 30
Observation days (57%)
67
Maximum R
13
Days without observation
D: Day · T: Time (UT) · g: Number of groups · f: Number of spots · R: Relative number (10g+f) · Q: Seeing 1–5 · O: Observer · G: Assigned observer
| Drawing | D | T (UT) | g | f | R | Q | O | G |
|---|---|---|---|---|---|---|---|---|
| Drawing | 01 | 06:35 | 0 | 0 | 0 | 3 | Süleyman FİŞEK | SF |
| Drawing | 02 | 07:25 | 0 | 0 | 0 | 3 | Oğuzhan ÇAKIR | OÇ |
| Drawing | 06 | 10:05 | 1 | 1 | 11 | 3 | T.YONTAN=K.Y. | KY |
| Drawing | 07 | 09:10 | 0 | 0 | 0 | 3 | Olcay PLEVNE | OP |
| Drawing | 09 | 09:55 | 0 | 0 | 0 | 3 | Oğuzhan ÇAKIR | BC |
| Drawing | 12 | 09:30 | 1 | 3 | 13 | 3 | Ergün EGE | EE |
| Drawing | 13 | 10:10 | 1 | 22 | 32 | 3 | T.YONTAN=B.T. | BT |
| Drawing | 14 | 09:10 | 1 | 16 | 26 | 3 | T.YONTAN-K.Y. | KY |
| Drawing | 15 | 07:15 | 2 | 16 | 36 | 3 | Süleyman FİŞEK | SF |
| Drawing | 16 | 09:45 | 2 | 5 | 25 | 3 | Başar COŞKUNOĞLU | OÇ |
| Drawing | 20 | 07:40 | 4 | 27 | 67 | 3 | Korhan YELKENCİ | KY |
| Drawing | 21 | 07:25 | 3 | 9 | 39 | 3 | Olcay PLEVNE | OP |
| Drawing | 22 | 09:20 | 4 | 13 | 53 | 3 | Burçin TANIK | BT |
| Drawing | 26 | 08:15 | 4 | 25 | 65 | 3 | Hikmet ÇAKMAK | HÇ |
| Drawing | 27 | 08:50 | 3 | 26 | 56 | 3 | Burçin TANIK | BT |
| Drawing | 28 | 09:30 | 3 | 10 | 40 | 3 | Ergün EGE | EE |
| Drawing | 29 | 09:20 | 3 | 14 | 44 | 3 | Talar YONTAN | TY0 |
| Monthly Mean of Relative Number: 29.82 [17 observations; 57%] | ||||||||
Observers Observation days this month and mean observing times
| Observer | Days | Mean time (all) | Mean time (own duty days) |
|---|---|---|---|
| Talar Yontan TY0 | 4 | 09:41 | 09:20 [1] |
| Süleyman Fişek SF | 2 | 06:55 | 06:55 [2] |
| Oğuzhan Çakır OÇ | 2 | 08:40 | 07:25 [1] |
| Olcay Plevne OP | 2 | 08:18 | 08:18 [2] |
| Ergün Ege EE | 2 | 09:30 | 09:30 [2] |
| Burçin Tanık BT | 2 | 09:05 | 09:05 [2] |
| Başar Coşkunoğlu BC | 1 | 09:45 | --:-- |
| Korhan Yelkenci KY | 1 | 07:40 | 07:40 [1] |
| Hikmet Çakmak HÇ | 1 | 08:15 | 08:15 [1] |
| Month total | 17 – 13 | Observing window: 06:00 – 08:00 UT | |
Colour: black = within the window, green = up to 30 min late, purple = later.
The last twelve months Development of the daily and monthly mean relative number
Observation days (2021): 66 / 120 (55%)
Days without observation: 54
Consecutive days: 4 (longest 6)