Slow EIT waves as gravity modes
dc.contributor.author | Vranjes, J. | |
dc.date | 2011 | |
dc.date.accessioned | 2016-03-29T12:43:54Z | |
dc.date.available | 2016-03-29T12:43:54Z | |
dc.identifier.uri | https://orfeo.belnet.be/handle/internal/3150 | |
dc.description | The EIT waves named after the extreme-ultraviolet imaging telescope (EIT) onboard the solar and heliospheric observatory (SOHO) are in the literature usually described as fast magneto-acoustic (FMA) modes. However, observations show that a large percentage of these events propagate with very slow speeds that may be as low as 20 km/s. This is far below the FMA wave speed which cannot be below the sound speed, the latter being typically larger than 10 2 km/s in the corona. In the present study, it is shown that, to account for such low propagation speed, a different wave model should be used, based on the theory of gravity waves, both internal (IG) and surface (SG) ones. The gravity modes are physically completely different from the FMA mode, as they are essentially dispersive and in addition the IG wave is a transverse mode. Both the IG and the SG mode separately can provide proper propagation velocities in the whole low speed range. | |
dc.language | eng | |
dc.title | Slow EIT waves as gravity modes | |
dc.type | Article | |
dc.subject.frascati | Physical sciences | |
dc.audience | Scientific | |
dc.subject.free | Extreme-ultraviolet imaging telescopes | |
dc.subject.free | Gravity modes | |
dc.subject.free | Low speed | |
dc.subject.free | Low-propagation | |
dc.subject.free | Propagation velocities | |
dc.subject.free | Solar and heliospheric observatories | |
dc.subject.free | Sound speed | |
dc.subject.free | Theory of gravity | |
dc.subject.free | Transverse mode | |
dc.subject.free | Wave models | |
dc.subject.free | Wave speed | |
dc.subject.free | Magnetoacoustic effects | |
dc.subject.free | Speed | |
dc.subject.free | Diagnostic radiography | |
dc.source.title | Physics of Plasmas | |
dc.source.volume | 18 | |
dc.source.issue | 6 | |
dc.source.page | 62902 | |
Orfeo.peerreviewed | Yes | |
dc.identifier.doi | 10.1063/1.3597136 | |
dc.identifier.scopus | 2-s2.0-79960170031 |