The structure of the magnetic field of a magnetar. a) The magnetic lines with induction <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle ~B}"><semantics><mrow class="MJX-TeXAtom-ORD"><mstyle displaystyle="true" scriptlevel="0"><mtext> </mtext><mi>B</mi></mstyle></mrow><annotation encoding="application/x-tex">{\displaystyle ~B}</annotation></semantics></math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/9b0f733e87842725692fbe008e10b1182254de73" class="mwe-math-fallback-image-inline" aria-hidden="true" style="vertical-align: -0.338ex; width:2.345ex; height:2.176ex;" alt="{\displaystyle ~B}"></span>. <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle ~P_{m}}"><semantics><mrow class="MJX-TeXAtom-ORD"><mstyle displaystyle="true" scriptlevel="0"><mtext> </mtext><msub><mi>P</mi><mrow class="MJX-TeXAtom-ORD"><mi>m</mi></mrow></msub></mstyle></mrow><annotation encoding="application/x-tex">{\displaystyle ~P_{m}}</annotation></semantics></math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/ed7d0dab302b75eff9ab353cc1b87ae834c412f5" class="mwe-math-fallback-image-inline" aria-hidden="true" style="vertical-align: -0.671ex; width:3.748ex; height:2.509ex;" alt="{\displaystyle ~P_{m}}"></span> and <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle ~L_{m}}"><semantics><mrow class="MJX-TeXAtom-ORD"><mstyle displaystyle="true" scriptlevel="0"><mtext> </mtext><msub><mi>L</mi><mrow class="MJX-TeXAtom-ORD"><mi>m</mi></mrow></msub></mstyle></mrow><annotation encoding="application/x-tex">{\displaystyle ~L_{m}}</annotation></semantics></math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/c04a2a200220a165349104b5ad712ea5be07e7d0" class="mwe-math-fallback-image-inline" aria-hidden="true" style="vertical-align: -0.671ex; width:3.839ex; height:2.509ex;" alt="{\displaystyle ~L_{m}}"></span> are the magnetic moment and the star’s spin. b) The orientation of the magnetic moments and spins of neutrons and protons in the equatorial plane; <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle ~P_{n}}"><semantics><mrow class="MJX-TeXAtom-ORD"><mstyle displaystyle="true" scriptlevel="0"><mtext> </mtext><msub><mi>P</mi><mrow class="MJX-TeXAtom-ORD"><mi>n</mi></mrow></msub></mstyle></mrow><annotation encoding="application/x-tex">{\displaystyle ~P_{n}}</annotation></semantics></math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/f447726d70f3c778cc44addd2bc6f272ee01e13f" class="mwe-math-fallback-image-inline" aria-hidden="true" style="vertical-align: -0.671ex; width:3.291ex; height:2.509ex;" alt="{\displaystyle ~P_{n}}"></span> and <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle ~L_{n},}"><semantics><mrow class="MJX-TeXAtom-ORD"><mstyle displaystyle="true" scriptlevel="0"><mtext> </mtext><msub><mi>L</mi><mrow class="MJX-TeXAtom-ORD"><mi>n</mi></mrow></msub><mo>,</mo></mstyle></mrow><annotation encoding="application/x-tex">{\displaystyle ~L_{n},}</annotation></semantics></math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/562d927a4f70b7c0e82726bd61d435ddeffef9bd" class="mwe-math-fallback-image-inline" aria-hidden="true" style="vertical-align: -0.671ex; width:4.029ex; height:2.509ex;" alt="{\displaystyle ~L_{n},}"></span>  <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle ~P_{p}}"><semantics><mrow class="MJX-TeXAtom-ORD"><mstyle displaystyle="true" scriptlevel="0"><mtext> </mtext><msub><mi>P</mi><mrow class="MJX-TeXAtom-ORD"><mi>p</mi></mrow></msub></mstyle></mrow><annotation encoding="application/x-tex">{\displaystyle ~P_{p}}</annotation></semantics></math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/c057abfd62994058b83efbc4c4218bd72a8c79ce" class="mwe-math-fallback-image-inline" aria-hidden="true" style="vertical-align: -1.005ex; width:3.132ex; height:2.843ex;" alt="{\displaystyle ~P_{p}}"></span> and <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle ~L_{p}}"><semantics><mrow class="MJX-TeXAtom-ORD"><mstyle displaystyle="true" scriptlevel="0"><mtext> </mtext><msub><mi>L</mi><mrow class="MJX-TeXAtom-ORD"><mi>p</mi></mrow></msub></mstyle></mrow><annotation encoding="application/x-tex">{\displaystyle ~L_{p}}</annotation></semantics></math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/0aff16ec8e5cf4b5e1948d6adb13b41ffc797424" class="mwe-math-fallback-image-inline" aria-hidden="true" style="vertical-align: -1.005ex; width:3.223ex; height:2.843ex;" alt="{\displaystyle ~L_{p}}"></span> are the magnetic moments and spins of neutrons and protons, respectively.
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