<p>Using spectropolarimeter one can measure vector Magnetic field.</p>

<p>A spectropolarimeter based on a ferroelectric liquid-crystal modulator is described. An optical system with spatial modulation of the positions of the components of Zeeman splitting is a specific feature of this instrument. In comparison to the familiar instruments, the developed spectropolarimeter utilizes the light flux more efficiently and contains only one photodetector array. An operating spectropolarimeter developed at the Sayan Solar Observatory is considered as an example. Comparative estimates of noises in different operating modes are presented.</p>

<p>(Ref: Kolobov, D.Y., Kobanov, N.I. &amp; Grigoryev, V.M. Instrum Exp Tech (2008) 51: 124. <a href="https://doi.org/10.1134/S0020441208010156" rel="nofollow noreferrer">https://doi.org/10.1134/S0020441208010156</a>)</p>

CC BY-SA 4.0
2018-07-06T02:18:24.057Z
2018-07-06T02:18:24.057Z
Kartik Chhajed
<p>Magnetic field strength is measured using Zeeman splitting. This is the one of the way Sun's magnetic field strength is measured. Now, how one measure vector magnetic field?
Vector magnetic field = Magnetic field and it's components.</p>

CC BY-SA 4.0
2018-07-03T13:13:48.750Z
Look at the flow of plasma. This might help you understand more: https://www.nasa.gov/feature/goddard/2016/understanding-the-magnetic-sun
Kornpob Bhirombhakdi
CC BY-SA 4.0
2018-07-06T02:11:58.807Z
That page again says "Additionally, the footpoints on the sun’s surface, or photosphere, of these magnetic loops can be more precisely measured using an instrument called a magnetograph, which measures the strength and direction of magnetic fields." --- And this was my question too!
Kartik Chhajed
CC BY-SA 4.0
2018-07-06T02:20:58.057Z
We scientist use vector magnetogram to extrapolate magnetic field in Sun's Corona and uses phenomena happening on Sun to match the result. What I didn't know was, how do one measure vector magnetogram. Now it's clear.
Kartik Chhajed
<magnetic-field>
How does one measure vector magnetic field of astrophysical object?
Kartik Chhajed
# How does one measure vector magnetic field of astrophysical object?

(Asked by: username_0 on 2018-06-30)

Magnetic field strength is measured using Zeeman splitting. This is the one of the way Sun's magnetic field strength is measured. Now, how one measure vector magnetic field?
Vector magnetic field = Magnetic field and it's components.

**Tags:** magnetic-field
> **Comments:**
> **username_1**: Look at the flow of plasma. This might help you understand more: https://www.nasa.gov/feature/goddard/2016/understanding-the-magnetic-sun  
> **username_0**: That page again says "Additionally, the footpoints on the sun’s surface, or photosphere, of these magnetic loops can be more precisely measured using an instrument called a magnetograph, which measures the strength and direction of magnetic fields." --- And this was my question too!  
> **username_0**: We scientist use vector magnetogram to extrapolate magnetic field in Sun's Corona and uses phenomena happening on Sun to match the result. What I didn't know was, how do one measure vector magnetogram. Now it's clear.  

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## 1 answers

### Answer by username_0 on 2018-07-06. Score: 0 | Accepted answer

Using spectropolarimeter one can measure vector Magnetic field.

A spectropolarimeter based on a ferroelectric liquid-crystal modulator is described. An optical system with spatial modulation of the positions of the components of Zeeman splitting is a specific feature of this instrument. In comparison to the familiar instruments, the developed spectropolarimeter utilizes the light flux more efficiently and contains only one photodetector array. An operating spectropolarimeter developed at the Sayan Solar Observatory is considered as an example. Comparative estimates of noises in different operating modes are presented.

(Ref: Kolobov, D.Y., Kobanov, N.I. & Grigoryev, V.M. Instrum Exp Tech (2008) 51: 124. <https://doi.org/10.1134/S0020441208010156>)


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