octupole

Definitions

noun physics Anything having eight poles or electrodes, but especially a combination of two quadrupoles used for controlling beams of charged particles

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The reported anomalies the team examined are many – two prominent cold spots, strength of the quadrupole, lack of large angular scale CMB power, alignment of the quadrupole and octupole components, hemispherical or dipole power asymmetry, to name but a handful – but the reasons for the apparent anomalies are few.

Seven-Year WMAP Results: No, They're NOT Anomalies | Universe Today 2010
Nevertheless, the supermode idea is still constrained — the dipole cancels, but there are higher-order effects (quadrupole and octupole) that are observable.

Superhorizon Perturbations and the Cosmic Microwave Background Sean 2008
We show that an adiabatic superhorizon perturbation in a LCDM universe does not generate a CMB temperature dipole, and we derive constraints to the amplitude and wavelength of a superhorizon potential perturbation from measurements of the CMB quadrupole and octupole.

Superhorizon Perturbations and the Cosmic Microwave Background Sean 2008
In particular, the octupole moment (l = 3) is now in much better agreement than it used to be.

WMAP results — cosmology makes sense! Sean 2006
2S1 / 2-2F7 / 2 electric octupole transition in a single 171Yb+ ion, Phys.

PhysOrg.com - latest science and technology news stories 2009
"But we still need to develop a narrower probe laser to drive the octupole clock transition more efficiently and without perturbing the ion's spectrum too much.

PhysOrg.com - latest science and technology news stories 2009