The relation between low-latitude neutral density variations near 400 km and magnetic activity indices

Details The relation between low-latitude neutral density variations near 400 km and magnetic activity indices The relation between low-latitude neutral density variations near 400 km and magnetic activity indices

Dec 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973p%26ss...21.2049a&link_type=abstract

Planetary and Space Science, Volume 21, Issue 12, p. 2049-2060.

Computer Science

1

Scientific paper

Neutral density data were obtained near 400km (1600 LT) from a microphone density gauge on OGO-6 from 0°G to 40°N magnetic latitude for 25 September-3 October 1969. Several geomagnetic storms occurred during this period (ap varied from 0 to 207). Least-squares fits were made to data points on density-ap and density-Dst scatter diagrams, where the density values selected were delayed in time behind ap and Dst. An equation representing the least-squares fit was computed for each delay time. The equation of best fit (and the corresponding time delay between the density and the magnetic index which resulted in this best fit) was found by choosing the equation that gave the minimum standard error. For example, the best fit at 10°N geomagnetic latitude occurred for ap at t - 3 hr, where t is the time of the density values. The implications of the time differences associated with the best fits at various latitudes and longitudes are discussed with regard to the time delays involved in geomagnetic heating of the neutral upper atmosphere. A low-latitude density bulge has been found between 0°N and 40°N whose magnitude varies with ap. DeVries (1972b) has independently discovered this daytime phenomenon. If the bulge is a semi-permanent feature near the equinoxes because of the enhanced geomagnetic activity, this may help explain the semi-annual effect in density, which was uncovered first in the drag data from low inclination satellites.

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