Event Title

Neutral Winds and Energy Dissipation Rates in the Auroral E Region

Location

Yosemite National Park

Start Date

2-7-1974 9:45 AM

End Date

2-7-1974 10:00 AM

Description

The Chatanika, Alaska incoherent scatter radar facility has provided simultaneous measurements of the ion drift velocities and densities in the E and F regions. From these data are calculated the magnetospheric electric field, E region mean effective neutral wind (up to about 160 km), the electrical currents flowing transverse to the geomagnetic field and the subsequent Joule dissipation rate. Height-integrated Joule dissipation rates of 1 erg/cm2/sec and larger are commonly measured near the auroral oval, and a peak rate of 94 ergs/cm2/sec was observed once. Because of the nature of the measurements one is able to distinguish the work done by (or on) the sources of the electric field and by the neutral wind. Evidence is found for dynamo action by the neutral wind, but the convection electric field is the major energy source for the Joule dissipation.

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Feb 7th, 9:45 AM Feb 7th, 10:00 AM

Neutral Winds and Energy Dissipation Rates in the Auroral E Region

Yosemite National Park

The Chatanika, Alaska incoherent scatter radar facility has provided simultaneous measurements of the ion drift velocities and densities in the E and F regions. From these data are calculated the magnetospheric electric field, E region mean effective neutral wind (up to about 160 km), the electrical currents flowing transverse to the geomagnetic field and the subsequent Joule dissipation rate. Height-integrated Joule dissipation rates of 1 erg/cm2/sec and larger are commonly measured near the auroral oval, and a peak rate of 94 ergs/cm2/sec was observed once. Because of the nature of the measurements one is able to distinguish the work done by (or on) the sources of the electric field and by the neutral wind. Evidence is found for dynamo action by the neutral wind, but the convection electric field is the major energy source for the Joule dissipation.