Determination of ionospheric conductivities from FUV auroral emissions

Details Determination of ionospheric conductivities from FUV auroral emissions Determination of ionospheric conductivities from FUV auroral emissions

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9923297g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A12, p. 23,297-23,305

Physics

22

Auroras, Energy Distribution, Extreme Ultraviolet Radiation, Geomagnetism, Ionospheric Conductivity, Oxygen Spectra, Solar Activity, Ultraviolet Emission, Ionospheric Currents, Magnetosphere-Ionosphere Coupling, Particle Precipitation

Scientific paper

The purpose of this paper is to examine the viability of using Lyman-Birge-Hopfeld (LBH) emission ratios to infer auroral conductances and to quantify the strengths and weaknesses of this technique. We show that column-integrated Hall and Pedersen conductances may be determined from a single remote measurement of a pair of auroral LBH emissions, one in the region of strong O2 absorption (1464 A) and one lying outside of this region (1838 A). The dependence of the determined conductivities on incident average energy, total energy flux, and changes in solar and magnetic activity levels is examined. We show that, for eneriges above 5 keV, auroral conductances may be scaled by the square root of the incident energy flux with errors less than about 20%. For lower energies, however, the scaling may deviate significantly from a power of 0.5. We provide appropriate scaling factors as a function of average energy. We also note that the choice of either a Gaussian or Maxwellian distribution can significantly affect low-energy (less than keV) conductance calculations. Finally, we quantify the conditions under which the mean energy of a Gaussian energy distribution may differ significantly from the characteristic energy.

Affiliated with

Also associated with

No associations

Rating

Determination of ionospheric conductivities from FUV auroral emissions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Determination of ionospheric conductivities from FUV auroral emissions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Determination of ionospheric conductivities from FUV auroral emissions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1411661