| Proposal ID | 069211 |
| Title | Understanding Coronal Super-Saturation |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0692110101 |
| DOI | https://doi.org/10.5270/esa-wif9d1z |
| Principal Investigator, PI | Prof Rob Jeffries |
| Abstract | Despite 15 years since discovery, the cause of super-saturation - the reductionof coronal X-ray activity in very fast-rotating G- and K-stars - is still notresolved, yet must provide important clues to the behaviour of magnetic dynamos,B-field topology, and angular momentum loss at extreme rotation rates. Bymeasuring the X-ray activity of several small M-dwarfs, rotating at twice therate of previously studied objects, we will determine which parameter (rotationperiod, Rossby number or Keplerian co-rotation radius) best predictssuper-saturation and hence test whether centrifugal stripping of the outercorona is a viable model. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2012-05-11T18:49:27Z/2012-08-27T14:19:54Z |
| Version | 21.51_20241115_1113 |
| Mission Description | The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis. |
| Creator Contact | https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk |
| Date Published | 2013-09-08T00:00:00Z |
| Last Update | 2026-07-09 |
| Keywords | "viable model", "super saturation", "magnetic dynamos", "coronal super saturation", "parameter rotation period", "fast rotating", "predicts super saturation", "coronal xray activity", "rotation rates", "field topology", "angular momentum loss", "outer corona", "xray activity" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Prof Rob Jeffries, 2013, 'Understanding Coronal Super-Saturation', 21.51_20241115_1113, European Space Agency, https://doi.org/10.5270/esa-wif9d1z |
| Rights | Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license. |