Talk:Active region

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Missing information

While the Solar cycle article covers many aspects, it seems to me (not an astronomer or scientist) this article needs expansion to include:

The science behind measurement to determine what is an actual active region.
Durations and sizes of active regions, perhaps a table.
Largest and smallest active areas. (recent time, historical)
List of shortest and longest activity times. (recent time, historical)

Each of these could be written as seperate article sections. Above list is in no particluar order so each of the topics can be added in any sequence.

Lastly, because of the small amount of content, at first I was planning to assess as Class Stub, but after further thought, Class Start, with "Missing information" tag. JoeNMLC (talk) 02:55, 22 July 2021 (UTC)[reply]

Thanks for the assessment, I hope to add a lot more later when I am less busy. Here are some more topics:

Classification^[1] and NOAA numbering
Formation and evolution
Polarity inversion line (PIL)
Helicity^[2]^[3]^[4]^[5]
Net (unneutralized) electric currents^[6]^[7]
Connection to their associated phenomena (e.g., sunspots and solar flares}
Seismology^[8]^[9]

I have also given some sources that may be helpful. CoronalMassAffection (talk) 00:32, 23 July 2021 (UTC)[reply]

References

^ Jaeggli, S. A.; Norton, A. A. (16 March 2016). "THE MAGNETIC CLASSIFICATION OF SOLAR ACTIVE REGIONS 1992–2015". The Astrophysical Journal. 820 (1): L11. doi:10.3847/2041-8205/820/1/L11.{{cite journal}}: CS1 maint: unflagged free DOI (link)
^ Hagino, Masaoki; Sakurai, Takashi (25 October 2004). "Latitude Variation of Helicity in Solar Active Regions". Publications of the Astronomical Society of Japan. 56 (5): 831–843. doi:10.1093/pasj/56.5.831.
^ Choudhuri, Arnab Rai; Chatterjee, Piyali; Nandy, Dibyendu (1 November 2004). "Helicity of Solar Active Regions from a Dynamo Model". The Astrophysical Journal. 615 (1): L57–L60. doi:10.1086/426054.
^ Avallone, Ellis A.; Sun, Xudong (22 April 2020). "Electric Current Neutralization in Solar Active Regions and Its Relation to Eruptive Activity". The Astrophysical Journal. 893 (2): 123. doi:10.3847/1538-4357/ab7afa.{{cite journal}}: CS1 maint: unflagged free DOI (link)
^ Hagino, Masaoki; Sakurai, Takashi (25 June 2005). "Solar-Cycle Variation of Magnetic Helicity in Active Regions". Publications of the Astronomical Society of Japan. 57 (3): 481–485. doi:10.1093/pasj/57.3.481.
^ Wheatland, M. S. (20 March 2000). "Are Electric Currents in Solar Active Regions Neutralized?". The Astrophysical Journal. 532 (1): 616–621. doi:10.1086/308577.
^ Dalmasse, K.; Aulanier, G.; Démoulin, P.; Kliem, B.; Török, T.; Pariat, E. (25 August 2015). "THE ORIGIN OF NET ELECTRIC CURRENTS IN SOLAR ACTIVE REGIONS". The Astrophysical Journal. 810 (1): 17. doi:10.1088/0004-637X/810/1/17.
^ Cally, P. S. (March 2007). "What to look for in the seismology of solar active regions". Astronomische Nachrichten. 328 (3–4): 286–291. doi:10.1002/asna.200610731.
^ Anfinogentov, Sergey A.; Nakariakov, V. M. (15 October 2019). "Magnetohydrodynamic Seismology of Quiet Solar Active Regions". The Astrophysical Journal. 884 (2): L40. doi:10.3847/2041-8213/ab4792.{{cite journal}}: CS1 maint: unflagged free DOI (link)

[1] Jaeggli, S. A.; Norton, A. A. (16 March 2016). "THE MAGNETIC CLASSIFICATION OF SOLAR ACTIVE REGIONS 1992–2015". The Astrophysical Journal. 820 (1): L11. doi:10.3847/2041-8205/820/1/L11.{{cite journal}}: CS1 maint: unflagged free DOI (link)

[2] Hagino, Masaoki; Sakurai, Takashi (25 October 2004). "Latitude Variation of Helicity in Solar Active Regions". Publications of the Astronomical Society of Japan. 56 (5): 831–843. doi:10.1093/pasj/56.5.831.

[3] Choudhuri, Arnab Rai; Chatterjee, Piyali; Nandy, Dibyendu (1 November 2004). "Helicity of Solar Active Regions from a Dynamo Model". The Astrophysical Journal. 615 (1): L57–L60. doi:10.1086/426054.

[4] Avallone, Ellis A.; Sun, Xudong (22 April 2020). "Electric Current Neutralization in Solar Active Regions and Its Relation to Eruptive Activity". The Astrophysical Journal. 893 (2): 123. doi:10.3847/1538-4357/ab7afa.{{cite journal}}: CS1 maint: unflagged free DOI (link)

[5] Hagino, Masaoki; Sakurai, Takashi (25 June 2005). "Solar-Cycle Variation of Magnetic Helicity in Active Regions". Publications of the Astronomical Society of Japan. 57 (3): 481–485. doi:10.1093/pasj/57.3.481.

[6] Wheatland, M. S. (20 March 2000). "Are Electric Currents in Solar Active Regions Neutralized?". The Astrophysical Journal. 532 (1): 616–621. doi:10.1086/308577.

[7] Dalmasse, K.; Aulanier, G.; Démoulin, P.; Kliem, B.; Török, T.; Pariat, E. (25 August 2015). "THE ORIGIN OF NET ELECTRIC CURRENTS IN SOLAR ACTIVE REGIONS". The Astrophysical Journal. 810 (1): 17. doi:10.1088/0004-637X/810/1/17.

[8] Cally, P. S. (March 2007). "What to look for in the seismology of solar active regions". Astronomische Nachrichten. 328 (3–4): 286–291. doi:10.1002/asna.200610731.

[9] Anfinogentov, Sergey A.; Nakariakov, V. M. (15 October 2019). "Magnetohydrodynamic Seismology of Quiet Solar Active Regions". The Astrophysical Journal. 884 (2): L40. doi:10.3847/2041-8213/ab4792.{{cite journal}}: CS1 maint: unflagged free DOI (link)

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