Dayside/nightside asymmetry of ion densities and velocities in Saturn's inner magnetosphere
2014 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 41, no 11, 3717-3723 p.Article in journal, Letter (Refereed) Published
We present Radio and Plasma Wave Science Langmuir probe measurements from 129 Cassini orbits, which show a day/night asymmetry in both ion density and ion velocity in the radial region 4–6 RS (1 RS = 60,268 km) from the center of Saturn. The ion densities ni vary from an average of ∼35 cm−3 around noon up to ∼70 cm−3 around midnight. The ion velocities vi,θ vary from ∼28–32 km/s at the lowest dayside values to ∼36–40 km/s at the highest nightside values. The day/night asymmetry is suggested to be due to the radiation pressure force acting on negatively charged nanometer-sized dust of the E ring. This force will introduce an extra grain and ion drift component equivalent to the force of an additional electric field of 0.1–2 mV/m for 10–50 nm sized grains.
Place, publisher, year, edition, pages
2014. Vol. 41, no 11, 3717-3723 p.
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:uu:diva-227095DOI: 10.1002/2014GL060229ISI: 000339280200005OAI: oai:DiVA.org:uu-227095DiVA: diva2:728434