Deciphering Solar Magnetic Activity: Spotting Solar Cycle 25
We present observational signatures of solar cycle 25 onset. Those signatures are visibly following a migratory path from high to low latitudes. They had starting points that are asymmetrically offset in each hemisphere at times that are 21–22 years after the corresponding, same polarity, activity b...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2017-06-01
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| Series: | Frontiers in Astronomy and Space Sciences |
| Subjects: | |
| Online Access: | http://journal.frontiersin.org/article/10.3389/fspas.2017.00004/full |
| _version_ | 1818845540409933824 |
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| author | Scott W. McIntosh Robert J. Leamon |
| author_facet | Scott W. McIntosh Robert J. Leamon |
| author_sort | Scott W. McIntosh |
| collection | DOAJ |
| description | We present observational signatures of solar cycle 25 onset. Those signatures are visibly following a migratory path from high to low latitudes. They had starting points that are asymmetrically offset in each hemisphere at times that are 21–22 years after the corresponding, same polarity, activity bands of solar cycle 23 started their migration. Those bands define the so-called “extended solar cycle.” The four magnetic bands currently present in the system are approaching a mutually cancelling configuration, and solar minimum conditions are imminent. Further, using a tuned analysis of the daily band latitude-time diagnostics, we are able to utilize the longitudinal wave number (m = 1) variation in the data to more clearly reveal the presence of the solar cycle 25 bands. This clarification illustrates that prevalently active longitudes (different in each hemisphere) exist at mid-latitudes presently, lasting many solar rotations, that can be used for detailed study over the next several years with instruments like the Spectrograph on IRIS, the Spectropolarimeter on Hinode, and, when they come online, similar instruments on the Daniel K. Inouye Solar Telescope (DKIST) as we watch those bands evolve following the cancellation of the solar cycle 24 activity bands at the equator late in 2019. |
| first_indexed | 2024-12-19T05:31:17Z |
| format | Article |
| id | doaj.art-b9017d52c346459e89a9f8825cc22743 |
| institution | Directory Open Access Journal |
| issn | 2296-987X |
| language | English |
| last_indexed | 2024-12-19T05:31:17Z |
| publishDate | 2017-06-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Astronomy and Space Sciences |
| spelling | doaj.art-b9017d52c346459e89a9f8825cc227432022-12-21T20:34:14ZengFrontiers Media S.A.Frontiers in Astronomy and Space Sciences2296-987X2017-06-01410.3389/fspas.2017.00004271958Deciphering Solar Magnetic Activity: Spotting Solar Cycle 25Scott W. McIntosh0Robert J. Leamon1High Altitude Observatory, National Center for Atmospheric ResearchBoulder, CO, United StatesDepartment of Astronomy, University of MarylandCollege Park, MD, United StatesWe present observational signatures of solar cycle 25 onset. Those signatures are visibly following a migratory path from high to low latitudes. They had starting points that are asymmetrically offset in each hemisphere at times that are 21–22 years after the corresponding, same polarity, activity bands of solar cycle 23 started their migration. Those bands define the so-called “extended solar cycle.” The four magnetic bands currently present in the system are approaching a mutually cancelling configuration, and solar minimum conditions are imminent. Further, using a tuned analysis of the daily band latitude-time diagnostics, we are able to utilize the longitudinal wave number (m = 1) variation in the data to more clearly reveal the presence of the solar cycle 25 bands. This clarification illustrates that prevalently active longitudes (different in each hemisphere) exist at mid-latitudes presently, lasting many solar rotations, that can be used for detailed study over the next several years with instruments like the Spectrograph on IRIS, the Spectropolarimeter on Hinode, and, when they come online, similar instruments on the Daniel K. Inouye Solar Telescope (DKIST) as we watch those bands evolve following the cancellation of the solar cycle 24 activity bands at the equator late in 2019.http://journal.frontiersin.org/article/10.3389/fspas.2017.00004/fulldynamomagnetic fieldssunspotsSun: activitySun: interiorstars: activity |
| spellingShingle | Scott W. McIntosh Robert J. Leamon Deciphering Solar Magnetic Activity: Spotting Solar Cycle 25 Frontiers in Astronomy and Space Sciences dynamo magnetic fields sunspots Sun: activity Sun: interior stars: activity |
| title | Deciphering Solar Magnetic Activity: Spotting Solar Cycle 25 |
| title_full | Deciphering Solar Magnetic Activity: Spotting Solar Cycle 25 |
| title_fullStr | Deciphering Solar Magnetic Activity: Spotting Solar Cycle 25 |
| title_full_unstemmed | Deciphering Solar Magnetic Activity: Spotting Solar Cycle 25 |
| title_short | Deciphering Solar Magnetic Activity: Spotting Solar Cycle 25 |
| title_sort | deciphering solar magnetic activity spotting solar cycle 25 |
| topic | dynamo magnetic fields sunspots Sun: activity Sun: interior stars: activity |
| url | http://journal.frontiersin.org/article/10.3389/fspas.2017.00004/full |
| work_keys_str_mv | AT scottwmcintosh decipheringsolarmagneticactivityspottingsolarcycle25 AT robertjleamon decipheringsolarmagneticactivityspottingsolarcycle25 |