What is the best frequency for detecting audible AM radio signals from magnetars?

On Jul 15, 11:52 am, "George Dishman" <geo...@briar.demon.co.uk> wrote
in http://groups.google.com/group/sci.a...2a2a514?hl=en&
:

> http://en.wikipedia.org/wiki/Heliosphere
> Both the material within the region and the ISM are almost
> entirely ionised so are in a form known as "plasma", a
> soup of charged particles. One of the feautures of plasma
> is that is absorbs low frequency signals below what is
> called the "plasma cutoff frequency". Basically below
> the VHF band, space becomes increasingly opaque and signals
> from stars don't reach us.

Then what is the best frequency for detecting audible AM radio signals
from magnetars?

It seems like a no win-situation here. Too low and plasmas will cut it
off. Too high and you lose strength really fast.

http://www.terabeam.com/support/calc...space-loss.php

>From the above link, it seems that a higher-frequency radio wave would
lose its strength faster than a lower-frequency radio wave of the same
original strength would.

At the start of the transmission, both the higher and lower
frequencies maybe at the same power [watts-per-meter-squared].
However, the higher frequency will lose its strength -- and likely
dissipate into the noise floor -- quicker than the lower-frequency.
Hence, reception of higher-frequencies requires that the transmitter
and receiver be closer together.

In rec.radio.amateur.space Radium <glucegen1@gmail.com> wrote:
> On Jul 15, 11:52 am, "George Dishman" <geo...@briar.demon.co.uk> wrote
> in http://groups.google.com/group/sci.a...2a2a514?hl=en&
> :

<snip>

> Then what is the best frequency for detecting audible AM radio signals
> from magnetars?

Radio astronomy

http://www.nrao.edu/whatisra/
http://www2.jpl.nasa.gov/radioastronomy/
http://www.haystack.mit.edu/edu/unde..._tutorial.html

What it sounds like:

http://www.radio-astronomy.net/

Amateur radio astronomy

http://www.nitehawk.com/rasmit/
http://www.signalone.com/radioastronomy/telescope/
http://www.radiosky.com/

<snip remaining crap>

--
Jim Pennino

Remove .spam.sux to reply.

	#1
Radium	What is the best frequency for detecting audible AM radio signals from magnetars? On Jul 15, 11:52 am, "George Dishman" <geo...@briar.demon.co.uk> wrote in http://groups.google.com/group/sci.a...2a2a514?hl=en& : > http://en.wikipedia.org/wiki/Heliosphere > Both the material within the region and the ISM are almost > entirely ionised so are in a form known as "plasma", a > soup of charged particles. One of the feautures of plasma > is that is absorbs low frequency signals below what is > called the "plasma cutoff frequency". Basically below > the VHF band, space becomes increasingly opaque and signals > from stars don't reach us. Then what is the best frequency for detecting audible AM radio signals from magnetars? It seems like a no win-situation here. Too low and plasmas will cut it off. Too high and you lose strength really fast. http://www.terabeam.com/support/calc...space-loss.php >From the above link, it seems that a higher-frequency radio wave would lose its strength faster than a lower-frequency radio wave of the same original strength would. At the start of the transmission, both the higher and lower frequencies maybe at the same power [watts-per-meter-squared]. However, the higher frequency will lose its strength -- and likely dissipate into the noise floor -- quicker than the lower-frequency. Hence, reception of higher-frequencies requires that the transmitter and receiver be closer together.

	#2
jimp@specsol.spam.sux.com	Re: What is the best frequency for detecting audible AM radio signals from magnetars? In rec.radio.amateur.space Radium <glucegen1@gmail.com> wrote: > On Jul 15, 11:52 am, "George Dishman" <geo...@briar.demon.co.uk> wrote > in http://groups.google.com/group/sci.a...2a2a514?hl=en& > : <snip> > Then what is the best frequency for detecting audible AM radio signals > from magnetars? Radio astronomy http://www.nrao.edu/whatisra/ http://www2.jpl.nasa.gov/radioastronomy/ http://www.haystack.mit.edu/edu/unde..._tutorial.html What it sounds like: http://www.radio-astronomy.net/ Amateur radio astronomy http://www.nitehawk.com/rasmit/ http://www.signalone.com/radioastronomy/telescope/ http://www.radiosky.com/ <snip remaining crap> -- Jim Pennino Remove .spam.sux to reply.