At 08:16 20/09/00 , Christian Ackermann wrote: >Hi all, >does anyone know where I can find altitude/pressure profiles of the >atmosphere under normal conditions and during increased solar >activity? Is there an overall atmospheric density increase during >solar maximum or does the atmosphere pump up *only* during >geomagnetic storms? Christian, You will find altitude vs density plots in King-Hele's book observing Eath satellites. Yes there is an overall increase in atmospheric density at heights we are concerned with due to the extra ultraviolet radiation produced during solar maximum. The exosphere is hotter and hence denser. The height of transition bewtween a mainly helium composition and a hydrogen also changes , further complicating things, as this changes the scale height. Geomagnetic storm heating is produced by the extra electric currents in the auroral zone during the active phase of a goemagnetic storm. Its ordinary resistive heating like ones electric radiator. Tony Beresford ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/seesat/seesatindex.html
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