 |
| Titel |
Anomalous higher frequency component of ISSN and relationship between sunspot lifetime and their birthrate: explanation with an AR-1 model |
| VerfasserIn |
Alexander Shapoval, Jean-Louis Le Mouel, Mikhail Shnirman, Vincent Courtillot  |
| Konferenz |
EGU General Assembly 2017
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250149008
|
| Publikation (Nr.) |
 EGU/EGU2017-13319.pdf |
|
|
|
|
|
| Zusammenfassung |
| The higher frequency (HF) component of the daily ISSN time-series contributed anomalously
weakly to total energy during the last epoch of high solar activity (lower boundary of HF
component taken as 3–6 days). To explain this anomaly, we model the daily ISSN
as an autoregressive process of order one, with a noise component modulated by
the ∼ 11-yr cycle. We link the observed anomaly to positive correlations between
the "births" of sunspots in nearby locations when solar activity is high. We also
analyze the relationship between birth rate of sunspots and their average lifetime.
Our findings support the hypothesis that, on day-to-month scales, solar proxies
reflect the solar dynamo itself, accompanied by modulated noise and effects linked
to solar rotation. Representing solar activity as a combination of sunspot lifetime
and intensity of sunspot births should narrow choices of solar dynamo models. |
|
|
|
|
|
|