Untitled

Mein, P.

doi:10.1016/s0016-6995(84)80130-8

Cited by 7 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We find radial velocities in the range 25-30 km s-1 in the first phase of the ejection and -40 km s-l in the second phase. A complete study must include variation of the following parameters: source function, optical thickness and broadening of the He line (Mein, 1984).…”

Section: Discussionmentioning

confidence: 99%

“…In Figure 1 lc, the presence of the two maxima is due either to broadening of the line caused by microturbulence or to the superposition of two clouds of opposite velocities. A more extended study must be done in order to explain the broadening of the lines, and to take this effect into account in determining the cloud velocity (Mein, 1984). Two principal phases are visible during a mass ejection.…”

Section: Measured Contrastsmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic evolution of recurrent mass ejections observed in H? and Civ lines

Schmieder¹,

Mein²,

Martres³

et al. 1984

Sol Phys

View full text Add to dashboard Cite

During a coordinated SMY program, the consecutive formation of two new active centers merging together within AR 2646 was observed from 28 August, to 5 September, 1980. The two preceding spots compressed an inverse polarity spot on 1 September 1980, causing recurrent ejecta of matter with time intervals around 10 min. The observations of the MSDP spectrograph operating in He at the Meudon Solar tower and of the UVSP spectrometer on SMM in the C Iv 1548 ~ line show that cold and hot material had the same projection, although the upward Cw velocity structure was more extended than the He one. We present evidence that observed contrasts of the He absorbing structure can be interpreted in terms of a dynamic 'cloud model' overlying the chromosphere. He matter follows a magnetic channel with upward velocity around 20-30 km s -1 in the first phase of the event and with downward velocity (~ -40 km s -1) in the second phase. The stored energy is not sufficient to trigger a flare, nor even to propulse matter along the full length of an arch, because of the periodic reorganisation of the magnetic field.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Measured Contrastsmentioning

confidence: 99%

Dynamic evolution of recurrent mass ejections observed in H? and Civ lines

Schmieder¹,

Mein²,

Martres³

et al. 1984

Sol Phys

View full text Add to dashboard Cite

show abstract

The Tayassuidae (Mammalia, Artiodactyla) from the Quaternary of Entre Rios Province. A palaeofaunal review in Argentina

Gasparini¹,

Ferrero²

2010

njgpa

View full text Add to dashboard Cite

The Tayassuidae has a wide geographic distribution and stratigraphic record during the Quaternary of South America. Three genera of Tayassuidae (Platygonus, Catagonus and Tayassu) are recognized in this continent. Argentina has the greatest diversity and abundance of fossil tayassuids in South America. In the Argentine Mesopotamian, the oldest tayassuid records are from the late Pleistocene of Corrientes and Entre Rios provinces, and from an archaeological site in the Holocene of Misiones Province. This paper aims to: 1) describe the tayassuid materials found in the Pleistocene in Entre Rios Province; 2) review and update the palaeontological record of the family in the Mesopotamian region during the Quaternary; and 3) check the geographic and stratigraphic distribution in South America, specially in Argentina, of the tayassuids from the Mesopotamian region. The palaeontological evidence indicates that in this area, Tayassu and Catagonus, the latter for the first time, are registered only in late Pleistocene sediments. Furthermore, the record of Tayassu and Catagonus during the late Pleistocene in Entre Ríos Province reflects a faunistic difference in comparison with the extant mammal fauna. Today, in the Mesopotamian region, T. pecari and T. tajacu are part of the mammalian fauna of Misiones Province. In the north of Corrientes Province there is possibly the most austral record of T. pecari. Catagonus reaches its most southern distribution in the north of Santiago del Estero and the northeast of Tucumán; therefore at present this tayassuid does not inhabit the Argentine Mesopotamian.

show abstract

Evolução dos Toxodontia da América do Sul durante o Cenozoico: aspectos dentários, paleoclimáticos e paleoambientais

Braunn

Ribeiro

2017

Terrae Didat.

View full text Add to dashboard Cite

Os notoungulados são ungulados nativos sul-americanos registrados do Paleoceno ao Pleistoceno, e cuja diversidade declinou drasticamente durante o Plioceno, alcançando a América Central e América do Norte durante o Pleistoceno. Notoungulados evoluíram sob influência climática e ambiental, de linhagens arcaicas, com sistema mastigatório generalizado, com dentição completa, sem diastema, com molares e pré-molares braquiodontes, a formas especializadas com incisivos hipertrofiados, padrões oclusais da coroa simplificados e formas proto-hipsodontes e eu-hipsodontes. Estas comunidades viveram primeiramente em hábitats florestais quentes e úmidos, e posteriormente, em pastagens relativamente temperadas de hábitats abertos, com forte tendência à aridização e ao resfriamento ao longo do Cenozoico. Além da evolução da morfologia macroscópica dentária observada em Notoungulata, também é possível evidenciar a evolução dos tipos de microestrutura do esmalte, através da presença de características mais derivadas em formas eu-hipsodontes, indicando adaptação funcional e conferindo maior resistência ao consumo de vegetação mais abrasiva.

show abstract

Untitled

Cited by 7 publications

References 0 publications

Dynamic evolution of recurrent mass ejections observed in H? and Civ lines

Dynamic evolution of recurrent mass ejections observed in H? and Civ lines

The Tayassuidae (Mammalia, Artiodactyla) from the Quaternary of Entre Rios Province. A palaeofaunal review in Argentina

Evolução dos Toxodontia da América do Sul durante o Cenozoico: aspectos dentários, paleoclimáticos e paleoambientais

Contact Info

Product

Resources

About