Martian Crustal Field Influence on O ⁺ and O ₂ ⁺ Escape as Measured by MAVEN

Study of the Martian cold oxygen corona from the O I 130.4 nm by IUVS/MAVEN

First observations of the O I 130.4nm resonant line performed by the Imaging Ultraviolet Spectrograph (IUVS) aboard the Mars Atmosphere and Volatile EvolutioN mission (MAVEN) are presented in this paper. This emission line is observed during the different orbit phases of MAVEN. The atomic oxygen density and the temperature at 200 km are retrieved from an automatic pipeline using a radiative tra...

O+ ion beams reflected below the Martian bow shock: MAVEN observations

MAVEN observations of energy-time dispersed electron signatures in Martian crustal magnetic fields

Energy-time dispersed electron signatures are observed by the Mars Atmosphere and Volatile EvolutioN (MAVEN) mission in the vicinity of strong Martian crustal magnetic fields. Analysis of pitch angle distributions indicates that these dispersed electrons are typically trapped on closed field lines formed above strong crustal magnetic sources. Most of the dispersed electron signatures are charac...

A Source for the Martian Crustal Magnetic Field

The magnitude of the martian magnetic crustal field requires intensities of magnetization of large volumes of the martian crust to be stronger than any comparable volumes on Earth [1, 2]. The Martian magnetic field at 4.0 Gyr was about one order smaller than the present geomagnetic field [3-5], and because the generating volume for the martian dynamo is considerably smaller than that for the ge...

The Origin of Massive O - type Field Stars Part II : Field O stars as runaways

In two papers we try to confirm that all Galactic high-mass stars are formed in a cluster environment, by excluding that O-type stars found in the Galactic field actually formed there. In de Wit et al. (2004) we presented deep K-band imaging of 5 arcmin fields centred on 43 massive O-type field stars that revealed that the large majority of these objects are single objects. In this contribution...