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Low-altitude ion heating, downflowing ions, and BBELF waves in the return current region by Shen, Yangyang; Knudsen, David J.; Burchill, Johnathan K.; Howarth, Andrew D.; Yau, Andrew W.; Miles, David M.; James, H. Gordon; Perry, Gareth W.; Cogger, Leroy is a scholarly article available to read on EtoBox.

What is Low-altitude ion heating, downflowing ions, and BBELF waves in the return current region about?

Heavy (O+) ion energization and field-aligned motion in and near the ionosphere are still not well understood. Based on observations from the CASSIOPE Enhanced Polar Outflow Probe (e-POP) at altitudes between 325 km and 730 km over one year, we present a statistical study (24 events) of ion heating and its relation to field-aligned ion bulk flow velocity, low-frequency waves and field-aligned currents (FACs). The ion temperature and field-aligned bulk flow velocity are derived from 2-D ion velocity distribution functions measured by the suprathermal electron imager (SEI) instrument. Consistent ion heating and flow velocity characteristics are observed from both the SEI and the rapid-scanning ion mass spectrometer (IRM) instruments. We find that transverse O+ ion heating in the ionosphere can be intense (up to 4.5 eV), confined to very narrow regions (~ 2 km across B), is more likely to occur in the downward current region, and is associated with broadband extremely low frequency (BBELF) waves. These waves are interpreted as linearly polarized perpendicular to the magnetic field. The amount of ion heating cannot be explained by frictional heating, and the correlation of ion heating

Author

Shen, Yangyang; Knudsen, David J.; Burchill, Johnathan K.; Howarth, Andrew D.; Yau, Andrew W.; Miles, David M.; James, H. Gordon; Perry, Gareth W.; Cogger, Leroy

Published

2018

Language

EN