Auroral Poles

Luminosity variations in several parallel auroral arcs before auroral breakup

Variation of the luminosity in two parallel auroral arcs before auroral breakup has been studied by using digitised TV-data with high temporal and spatial resolution. The intervals when a new arc appears near already existing one were chosen for analysis. It is shown, for all cases, that the appearance of a new arc is accompanied by fading or disappearance of another arc. We have named these ev...

Section III Auroral Region

Jupiter’s polar auroral emissions

[1] This paper reports a study of Jupiter’s polar auroral emissions observed in an extended series of FUV images. They were obtained on seven days, during winter 2000–2001, with the STIS camera on board the Hubble Space Telescope. The fixed pointing yielded highly accurate and consistent tracking of emisson features as Jupiter rotated, allowing the analysis of the auroral morphology and brightn...

Focusing on spindle poles.

Spindle poles are discernible by light microscopy as the sites where microtubules converge at the ends of both mitotic and meiotic spindles. In most cell types centrosomes are present at spindle poles due to their dominant role in microtubule nucleation. However, in some specialized cell types microtubules converge into spindle poles in the absence of centrosomes. Thus, spindle poles in centros...

Governance of both poles.

AT THE END OF THIS MONTH, THE ANTARCTIC TREATY SUMMIT IN WASHINGTON, DC, WILL CELEBRATE the 50th anniversary of an international agreement that has been centered around science, promoting cooperation to manage nearly 10% of Earth for peaceful purposes since 1 December 1959 (see www.atsummit50.aq). As the world moves toward negotiating effective policies related to climate change, lessons from t...