S21W72 Data 0000-00-00
Long Jupiter -25 area 6Region 12820 [S21W72] decayed slowly and quietly
S21E22 Data 2021-04-23
Long Jupiter -126 area 90New region 12820 [S21E22] emerged quickly on April 23
S21E08 Data 2021-04-24
Long Jupiter -111 area 180New region 12820 [S21E08] emerged quickly on April 23 and developed further on April 24 when it was numbered by SWPC. C flares are possible.
S21W04 Data 2021-04-25
Long Jupiter -98 area 180Region 12820 [S21W04] developed slowly and was mostly quiet.
S22W18 Data 2021-04-26
Long Jupiter -84 area 220Region 12820 [S22W18] developed further and produced a number of B flares. C flares are possible, as is a minor M class event. The proximity of the leader spot to the largest trailing spot of AR 12821 could lead to a more complex situation and more energetic flares.
S21W31 Data 2021-04-27
Long Jupiter -69 area 140Region 12820 [S21W31] decayed quietly losing spots and area.
S22W44 Data 2021-04-28
Long Jupiter -55 area 70Region 12820 [S22W44] decayed slowly and quietly.
S21W57 Data 2021-04-29
Long Jupiter -42 area 20Region 12820 [S21W57] decayed slowly and produced a few B flares.