File:VFPt Dipole field.svg
From KYNNpedia
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Original file (SVG file, nominally 700 × 600 pixels, file size: 39 KB)
Summary
| Description |
English: Schematic dipole field around the earth. (monochromatic) |
| Date | |
| Source | Own work |
| Author | Geek3 |
| Other versions | Dipole field.svg |
| SVG development | |
| Source code | Python code# paste this code at the end of VectorFieldPlot 1.3
doc = FieldplotDocument('VFPt_Dipole_field', commons=True, width=700, height=600, unit=100)
R = 1.55
sca = 2.4; lw = 1.0
field = Field({'dipoles':[[0, 0, 0, -1]]})
F = lambda t: sc.dot(field.F([R*cos(t), R*sin(t)]), [cos(t), sin(t)])
Fi = lambda t1: ig.quad(F, 0, t1)[0] * R
Fsum = Fi(pi)
line = FieldLine(field, [0, 5], directions='forward', maxr=10)
doc.draw_line(line, linewidth=lw, arrows_style={'dist':6-2*R, 'scale':sca,
'max_arrows':2, 'min_arrows':2, 'fixed_ends':[False, True, True, False]})
n = 15
p = -0.3
for i in range(n):
a = (i + 0.5 + p) / (n + 2*p)
t = op.brentq(lambda t:Fi(t) - a*Fsum, 0, pi)
if abs(i - n/2) > 4:
line = FieldLine(field, [R*cos(t), R*sin(t)], directions='both')
doc.draw_line(line, linewidth=lw, arrows_style={'dist':2*R, 'scale':sca,
'max_arrows':2, 'min_arrows':1, 'fixed_ends':[True, False, False, True]})
elif (i != 7):
line = FieldLine(field, [R*cos(t), R*sin(t)], directions='both', maxr=3)
doc.draw_line(line, linewidth=lw, arrows_style={'dist':2*R, 'scale':sca,
'max_arrows':1, 'min_arrows':1, 'fixed_ends':[False, False, False, True]})
line = FieldLine(field, [R*cos(t), -R*sin(t)], directions='both', maxr=3)
doc.draw_line(line, linewidth=lw, arrows_style={'dist':2*R, 'scale':sca,
'max_arrows':1, 'min_arrows':1, 'fixed_ends':[True, False, False, False]})
n2 = 3
for j in [-1,1]:
for i in range(n2):
a = (i + 0.5 - p) / (n + 2*p)
t = op.brentq(lambda t1: ig.quad(lambda r:field.F([r, 0.])[1], R, t1)[0] - a*Fsum, 0.1, R)
line = FieldLine(field, [j*t, 0.], directions='both')
doc.draw_line(line, linewidth=lw, arrows_style={'dist':2*R, 'scale':sca,
'max_arrows':1, 'min_arrows':1})
Re = 0.855
earth = doc.draw_object('g', {'id':'earth'})
doc.draw_object('circle', {'r':Re, 'cx':'0', 'cy':'0',
'style':'fill:#ffffff; stroke:#000000; stroke-width:0.01'}, group=earth)
doc.draw_object('path', {'d':'M -{0},0 A {0},{1} 0 0 1 {0},0'.format(Re, 0.2*Re),
'style':'fill:none; stroke:#000000; stroke-width:0.01'}, group=earth)
text_N = doc.draw_object('text', {'text-anchor':'middle', 'x':'0', 'y':37,
'transform':'translate(0,0.7) scale(0.002,-0.002)',
'style':'fill:#000000; stroke:none; font-size:100px; font-family:Bitstream Vera Sans'})
text_N.text = 'N'
text_S = doc.draw_object('text', {'text-anchor':'middle', 'x':'0', 'y':37,
'transform':'translate(0,-0.7) scale(0.002,-0.002)',
'style':'fill:#000000; stroke:none; font-size:100px; font-family:Bitstream Vera Sans'})
text_S.text = 'S'
doc.write()
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Licensing
I, the copyright holder of this work, hereby publish it under the following licenses:
|
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. |
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
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File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 22:44, 13 December 2010 | | 700 × 600 (39 KB) | wikimediacommons>Geek3 | own work |
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