Longitudinal and seasonal variations of the equatorial ionospheric density and drift velocities during solar minimum

Details Longitudinal and seasonal variations of the equatorial ionospheric density and drift velocities during solar minimum Longitudinal and seasonal variations of the equatorial ionospheric density and drift velocities during solar minimum

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa31a1706m&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA31A-1706

Physics

[0343] Atmospheric Composition And Structure / Planetary Atmospheres

Scientific paper

The C/NOFS satellite sensors measure the ion density, electric and magnetic fields, ion drift, ion and electron temperatures, neutral wind, total electron content and ionsopheric scintillation. The extended solar minimum prevailing during C/NOFS mission allow us to establish a baseline model of the seasonal variations of the topside equatorial ionosphere. The 13-degree inclination of the C/NOFS orbit causes the perigee to advances through all local times in about 66 days. This allows seasonal sampling of the ionsopheric density and drift velocity as a function of local time, magnetic latitude, altitude, and longitude. Measurements taken near the spacecraft's perigee at about 420 km altitude indicate an unusually cold low-density ionosphere with an O+ to H+ ratio of approximately 4 during nighttime conditions. Our analysis focuses on the behavior of the longitudinal structure of the equatorial ionospheric density and velocity at all the local times during the equinox months (August 21 to October 21st, February 21 to April 21st), northern summer months (April 21 to August 21st) and northern winter (October 21 to February 21) months for the year 2008 and 2009 near the perigee. The systematic study of the ion velocity and ion density with longitude will reveal new characteristics of the low latitude ionosphere during extreme solar minimum conditions.

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