"Jim Lux" napisal w wiadomosci
...
Szczepan Bialek wrote:


"The Earth is constantly immersed in the solar wind, a rarefied flow of
hot plasma (gas of free electrons and positive ions) emitted by the Sun
in all directions, a result of the two-million-degree heat of the Sun's
outermost layer, the corona. The solar wind usually reaches Earth with a
velocity around 400 km/s, density around 5 ions/cm3 and magnetic field
intensity around 2-5 nT (nanoteslas; Earth's surface field is typically
30,000-50,000 nT). These are typical values. During magnetic storms, in
particular, flows can be several times faster; the interplanetary
magnetic field (IMF) may also be much stronger."


Sure... the number density of ionized particles is somewhat bigger than
the 5/cc you describe above, so solar wind is actually not a big
contributor to it. Most of the ionization comes from UV ionizing the air
atoms/molecules. (that's what the whole daytime sky wave off the F layer
is all about, after all.. working Australia from the California on 20
meters at 5AM CA time probably isn't a good bet)

In space is also the dust. The ionized particles can come from them also.
The Moon is a big dust.

The aurora is NOT caused by acoustic waves.

" In the explosive event that a coronal mass ejection (CME) is reported
it's time to hop into action because this super-charged solar wind is
traveling fast (maybe 3-to-5 million miles per hour). When this energy
sweeps by the earth 1-to-3 nights later there is a very good chance of
aurora activity". From: http://aurorahunter.com/aurora-prediction.php


That's not acoustic. That's just particles streaming out into space, and
because there's not many other particles to bump into, most of them get to
Earth

Cars produce the hot wind (exhaust pipe) with the acoustic waves. Is
possible to produce only streaming?
There must be the oscillatory flow.
S*