Irradiance or luminosity changes?
| dc.creator | Sofia, Sabatino | |
| dc.creator | Li, Linghuai H. | |
| dc.date | 2000-10-20 | |
| dc.date.accessioned | 2026-07-07T01:56:08Z | |
| dc.date.available | 2026-07-07T01:56:08Z | |
| dc.description | Whereas a variation of the solar luminosity, L, will inevitably cause a similar change of the total solar irradiance, S, the opposite is not true. In fact, the bulk of the days to months variations of S can be explained entirely in terms of the passage of active regions across the solar disk. In this case, L remains essentially unchanged. For the total irradiance variation observed over the solar cycle, the issue is more uncertain. One view explains this modulation primarily as a combined action of active regions and magnetic network. These components would be superposed to an otherwise unchanging photosphere. the other view suggests that the activity cycle modulation of S is primarily produced by a variation of L (both in terms of R and T_{eff}) caused by structural reajustments of the interior of the Sun induced by a changing magnetic field. We will present evidence in support of this second interpretation, and a model for it. We will also present the S variations over the last 5 centuries implied by our model. | |
| dc.description | 5 pages, 8 figures. To be published in: The Solar Cycle and Terrestrial Climate, ESA Publ. SP-463, in press | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0010428 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0010428 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/1893 | |
| dc.subject | Astrophysics | |
| dc.title | Irradiance or luminosity changes? | |
| dc.type | text |