a class of analytic solutions for force-free electromagnetic fields

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    F

    F F(F)

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    A

    F = dA

    d A F

    A = Adx

    F = ,,

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    F F = 0, (F)F = 0

    K

    K (A F)

    K = 0, d K = 0;

    F = s1s2 s2s1

    s1 s2

    F = ds1 ds2

    A = s1ds2 + d

    ds1 ds2

    J =1

    4dh d1 d2

    h, 1, 2

    dF = 0, d F = dh d1 d2

    F = hd1 d2

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    F = h (d1 d2)

    dF = d (h (d1 d2)) = 0

    R = (d1 d2)

    R =1

    2i

    (1 + )2

    R = 1

    2i

    1 + 2

    dR = 0 d R = 0

    R = d1 d2

    R = du1 du2

    = Sexp(i2) = Sexp(i2)

    1 =1

    1 + S2, 2 = , u1 =

    1

    1 + S2, u2 =

    h = u1

    F = u1R

    F = u1 R = u1du1 du2 = d (u1)

    2

    2 du2

    F

    f = FJ = F

    1

    3! (J)

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    f = (u1du1 du2)1

    3!

    1

    4du1 d1 d2

    f = u1u1u21

    3!

    1

    4

    du1 d1 d2 f = u1u1

    1

    3!

    1

    4u2u112

    f =1

    12u1u1FF

    FF = 0

    RR

    = 0

    J F = 0;

    h = f(u1, u2)

    JJ = 0

    S3 S2

    (r

    , t) =

    (Ax tz) + i(Ay + t(A 1))

    (Az + tx) + i(A(A 1) ty)

    (r, t) =(Ay + t(A 1)) + i(Az + tx)

    (Ax tz) + i(A(A 1) ty)

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    A =x2 + y2 + z2 t2 + 1

    2

    1 = 11 +

    , 2 = 14i

    ln(

    )

    u1 =1

    1 + , u2 =

    1

    4iln(

    )

    2 u2

    h = u1

    F = R

    1 +

    (n)(r, t) =

    (Ax tz) + i(Ay + t(A 1))

    (Az + tx) + i(A(A 1) ty)

    n

    (n)(r, t) =

    (Ay + t(A 1)) + i(Az + tx)

    (Ax tz) + i(A(A 1) ty)

    n

    RR = R(R) = FF = F(F) = 0

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