kommt drauf an (mT)

verfasst von offthspc, 27.07.2004, 21:51

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Flares (sudden brightenings) affect the ionosphere immediately, with adverse effects upon communications and radio navigation (GPS and LORAN). Accompanying radio bursts from the Sun are expected to exceed cell phone system noise tolerances 2 - 3 times per solar cycle.

Solar energetic particles arrive in 20 minutes to several hours, threatening the electronics of spacecraft and unprotected astronauts, as they rise to 10,000 times the quiet background flux.

Ejected bulk plasma and its pervading magnetic field arrive in 30 - 72 hours (depending upon initial speed and deceleration) setting off a geomagnetic storm, causing currents to flow in the magnetosphere and particles to be energized. The currents cause atmospheric heating and increased drag for satellite operators; they also induce voltages and currents in long conductors at ground level, adversely affecting pipelines and electric power grids. The energetic particles cause the northern lights, as well as surface and deep dielectric charging of spacecraft; subsequent electrostatic discharge of the excess charge build-up can damage spacecraft electronics. The ionosphere departs from its normal state, due to the currents and the energetic particles, thereby adversely affecting communications and radionavigation.

Rayleigh-Taylor instability often occurs in tropical latitudes, causing rising bubbles to ascend out of the top of the ionosphere and substantially distorting the normal layering. This causes radio beams propagating through the rising columns to suffer up to 30 dB of scintillation; GPS receivers lose lock and communication signals break up as a result.

Quelle: http://sec.noaa.gov/info/FAQ.html#g7


mfG
offthspc

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