Computer Science – Sound
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh11a0363r&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH11A-0363
Computer Science
Sound
2447 Modeling And Forecasting, 2467 Plasma Temperature And Density, 2481 Topside Ionosphere, 2768 Plasmasphere
Scientific paper
Improved representation of F layer topside and plasmasphere electron density and temperature in the International Reference Ionosphere (IRI) [Bilitza, Radio Sci., 38(6), 261-275, 2001] are the goal of a new LWS TR&T tools project -TOPLA. Measurements by the radio plasma imager (RPI) on the IMAGE satellite [Reinisch et al., Geophys. Res. Ltts., 28, 24, 4521-4524, 2001] provide electron density profiles of the plasmasphere down to altitudes of ~3000 km. Groundbased observations with ionosondes and incoherent scatter radars led to empirical electron density models of the ionosphere like the IRI. We discuss the use of a Chapman-like function with a scale height that varies continuously with height, the "vary-Chap" function, for connecting the RPI plasmasphere density profile to the ionosphere profile above hmF2. While the original Chapman theory assumed the scale height of the neutral EUV-absorbing gas (atomic oxygen) to be constant, we allow it to vary with height, initially slowly near hmF2 [Reinisch et al., Adv. Space Res., 34, 2026-2031, 2004], and then rapidly at altitudes where [O] is replaced by [H] and/or [He] as the dominant species. A hyperbolic tangent function suitably represents this variation; we use it to parameterize the scale height function in terms of the transition height hT, the scale height HT at hT, and a parameter b characterizing the steepness of the transition. We also make use of ISIS 2 topside sounder profiles [Huang et al., Annali di Geofisica, 45 (1), 125-130, 2002] to develop an F2 topside-to-plasmasphere Ne model (TOPLA). The large database of ISIS profiles makes it possible to statistically evaluate the behavior of the scale height parameters hT, HT, and b, and show their dependence on season and latitude. In addition to electron density, the TOPLA modeling project includes an effort to improve the electron temperature Te profile for the IRI model in the topside ionosphere and an extension to the plasmasphere. A first step is to include the AKEBONO Te model developed by Kutiev et al. ( Adv. Space Res. 33, 1459, 2004) in the IRI model.
Bilitza Dieter
Huang Xing
Nsumei P.
Reinisch Bodo. W.
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