A Space & astronomy forum. SpaceBanter.com

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » SpaceBanter.com forum » Astronomy and Astrophysics » Research
Site Map Home Authors List Search Today's Posts Mark Forums Read Web Partners

Parker Solar Probe



 
 
Thread Tools Display Modes
  #1  
Old August 13th 18, 05:48 PM posted to sci.astro.research
Richard D. Saam
external usenet poster
 
Posts: 232
Default Parker Solar Probe

The Eugene Parker Solar Probe has just launched
to investigate close up solar magnetic and electric fields.
In his book:
"Conversations on Electric and Magnetic Fields in the Cosmos"
Dr Parker notes:
a SI charge non 'mass, length and time' definition as coulomb
is a limitation for dimensional analysis of such EM problems.
One wonders if his 'mass, length and time' analysis
of such EM problems in cgs units system
provided him with scientific reasoning in regards to solar EM fields
deemed crazy by his peers at the time 50 years ago
but which are currently accepted as true
and the basis for his named solar probe.

Richard D Saam

[[Mod. note -- Actually, there's very little dimensional analysis in
Parker's 1958 paper. That paper can be read online (open-access!) at
http://adsabs.harvard.edu/full/1958ApJ...128..664P
-- jt]]
Ads
  #2  
Old August 14th 18, 07:28 PM posted to sci.astro.research
Bruce D. Scott[_2_]
external usenet poster
 
Posts: 3
Default Parker Solar Probe

| [[Mod. note -- Actually, there's very little dimensional analysis in
| Parker's 1958 paper. That paper can be read online (open-access!) at
| http://adsabs.harvard.edu/full/1958ApJ...128..664P
| -- jt]]

When I was a student we learned from

Cosmical magnetic fields: Their origin and their activity
E N Parker
Oxford, Clarendon Press; New York, Oxford University Press, 1979

which was just out then!

Unfortunately it is 250 USD and up on Amazon

--
ciao,
Bruce

drift wave turbulence: http://www.rzg.mpg.de/~bds/
  #3  
Old August 15th 18, 06:07 AM posted to sci.astro.research
Richard D. Saam
external usenet poster
 
Posts: 232
Default Parker Solar Probe

On 8/13/18 11:48 AM, Richard D. Saam wrote:
The Eugene Parker Solar Probe has just launched
to investigate close up solar magnetic and electric fields.
In his book:
"Conversations on Electric and Magnetic Fields in the Cosmos"
Dr Parker notes:
a SI charge non 'mass, length and time' definition as coulomb
is a limitation for dimensional analysis of such EM problems.
One wonders if his 'mass, length and time' analysis
of such EM problems in cgs units system
provided him with scientific reasoning in regards to solar EM fields
deemed crazy by his peers at the time 50 years ago
but which are currently accepted as true
and the basis for his named solar probe.

Richard D Saam

[[Mod. note -- Actually, there's very little dimensional analysis in
Parker's 1958 paper. That paper can be read online (open-access!) at
http://adsabs.harvard.edu/full/1958ApJ...128..664P
-- jt]]

Thanks for Parker's paper.
His paper actually has a (mass(M), Length(L) Time(T)
dimensional point of view:

Dimensional
energy m*v^2 and k*T M^1*L^2*T^-2
gravitational force G*M*M/r^2
M^1*L^1*T^-2 = (M^-1*L^3*T^-2)(M^2*L^0*T^0)(M^0*L^-2*T^0)
thermal conductivity M^1*L^0*T^-3
appear throughout his paper
but consider the last equation (bottom of page 674)
that describes the torque
caused by spiraling waves from the sun's magnetic field (B)
with the physically descriptive equation:

Torque(M^1*L^2*T^-2) = force(M^1*L^1*T^-2)*distance(M^0*L^1*T^0)
=(9/15)*b^4(M^0*L^1*T^0)^4*omega((M^0*L^0*T^-1)*(1/v)(M^0*L^-1*T^1)
*B^2(M^1/2*L^-1/2*T^-1)^2*(1+b/r(M^0*L^0*T^0)

This conceptually reduces to

Torque ~ space volume containing magnetic field * magnetic field squared

or

Torque (in units of energy) = volume * energy/volume

The magnetic field B definition as

M^1/2*L^-1/2*T^-1

makes everything dimensionally flow.

Parker probably assumed the B and H field were equal (vacuum)
having the same M^1/2*L^-1/2*T^-1 units
where B = mu*H and permeability(mu) = 1

Of course, this all can be done in SI
with the Coulomb addition
but my mind hurts to think
how to make physical sense of it,
the finer points to which Parker addressed in his book.

One note:
Parker's secretary left out the '/sec'
after the angular velocity 2.7 x 10^-4
at the top of page 674.

Such a simple (and certainly not crazy)
scientific pen and paper reasoning thing
done by Parker
in part resulting in the Solar Probe in his name.

RDS
 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
[PS] Parker Solar Probe preview: 10 hot facts about NASA's coolmission to the Sun William Elliot[_4_] Science 4 August 20th 18 03:34 AM
Launch of NASA's Parker Solar Probe [email protected] Policy 9 August 15th 18 12:24 PM
Solar probe will FAIL RichA[_1_] Amateur Astronomy 7 April 28th 12 06:45 PM
> > > > the date of birth of matt parker is sep 13 1965 matt parker was born on 09 13 1965 matt parker alias e van lindt hout matt parker alias geronimojones matt parker stalks and tracks down clients to scam and blackmail them matt parker alias Saul Levy Misc 0 September 14th 04 10:19 PM


All times are GMT +1. The time now is 06:09 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright 2004-2018 SpaceBanter.com.
The comments are property of their posters.