Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa52a0405g&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SA52A-0405
Other
2481 Topside Ionosphere
Scientific paper
Helium ion concentrations in the lower topside ionosphere over Arecibo are presented for low and high solar flux periods of the same season. Data from October 8-9, 1988, October 21-22, 1995, October 26-27, 1997, and October 12-13, 2001 are compared. Two of these datasets (1988 and 2001) are from high solar flux conditions, while the other two (1995 and 1997) are from low solar flux conditons. All datasets represent geomagnetic 'quiet' periods over Arecibo, and serve as examples of typical topside datasets. For solar minimum conditions the altitude distribution of the helium ions usually has a maximum near the O+ to H+ transition altitude (ht) during the night. The helium ion number densities tend to be quite low, 2 or 3 x 103 cm-3, or 10-15 percent of the topside plasma density. For the case with higher solar flux, the helium ions form a more distinct layer at an altitude that is slightly above ht. In addition, the relative abundance of He\pl\ can reach 60 percent of the topside plasma at the peak of this layer. In this case the number densities are much higher than during solar minimum, reaching 4 x 104 cm-3.
González Sixto A.
Kerr Robert
Nicolls Michael
Sulzer Michael P.
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