Sentences with phrase «auroral emissions»

Auroral emissions typically occur at altitudes of about 100 km (60 miles) and are often green, white, or reddish in colour depending on what species (atomic oxygen, molecular oxygen, or nitrogen, respectively) is primarily emitting light.

Cassini used its Ultraviolet Imaging Spectrograph to capture this final view of ultraviolet auroral emissions in Saturn's north polar region on Sept. 14, 2017.

Moreover, Hallinan et al. (2015) showed that since the observed auroral emissions depended mainly on magnetic dipole moment and rotation (and may have been weakly coupled to other physical characteristics), aurora may be present at detectable levels even in the faintest T and Y dwarfs and bodies as well as from exoplanets.

Recently, signatures of CO Cameron and CO2 + doublet ultraviolet auroral emissions have been detected with SPICAM (Gérard et al. 2015); they showed that the Mars aurora is a temporary and spatially localized phenomenon appearing near the open - closed magnetic field line boundary in cusp - like structures.

Auroral emissions, occurring when charged particles in a planetary object's magnetosphere collide with atoms in its upper atmosphere, causing them to glow, are an important demonstration of planetary space weather.

Cassini UVIS observations revealed recently the presence of small - scale structures in the dayside main auroral emissions indicative of magnetopause Kelvin - Helmholtz instabilities, which are key elements of the solar wind - magnetosphere viscous interaction (Grodent et al. 2011).

Recently, Hallinan et al. (2015) reported simultaneous radio and optical spectroscopic observations (obtained with the Karl G. Jansky Very Large Array (VLA) radio telescope and the Double Spectrograph (DBSP) on the 5.1 - m Hale telescope, respectively) of auroral emissions of an object at the end of the stellar main sequence (i.e. at the boundary between stars and brown dwarfs).

The appearance of the plumes in this graphic is based on spectroscopic observations of oxygen and hydrogen in the auroral emissions.

However, the energetic particles associated with Jovian auroras are very different from those that power the most intense auroral emissions at Earth.»

«This is our best look yet at the rapidly changing patterns of auroral emission,» said Wayne Pryor, a Cassini co-investigator at Central Arizona College in Coolidge, Ariz. «Some bright spots come and go from image to image.

Not exact matches

While the cause of the auroral oval emissions is reasonably well understood, the origin of the theta aurora was unclear until now.

For one, with this discovery, scientists now know there are unknown chemical processes taking place in the sub auroral zone that can lead to this light emission.