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References in periodicals archive ?
The bottom-left X-ray image was taken on 7 April 2009, at activity minimum, and shows equatorial and polar coronal holes.
[13] who showed that jets preferably occur inside the polar coronal holes. Culhane et al.
[35] used the full-disk He ii 304 [Angstrom] movies from the Atmospheric Imaging Assembly on SDO to study the cool (T ~ [10.sup.5] K) component of X-ray jets observed in polar coronal holes by XRT.
Falconer, "Magnetic untwisting in solar jets that go into the outer corona in polar coronal holes," Astrophysical Journal, vol.
Teriaca, "Characteristics of polar coronal hole jets," Astronomy & Astrophysics, vol.
It is clearly shown here that the fast wind at high latitudes is closely associated with polar coronal holes where the magnetic field is open, and also that the slow wind at the equator is mostly linked to either the boundary region of polar coronal holes or the isolated low-latitude coronal holes.
(2008) Weaker solar wind from the polar coronal holes and the whole Sun.
Similar low-speed winds have been identified from the CAT analysis of our IPS observations over the pole at solar maximum, when the polar coronal hole shrinks in size before and after its disappearance.
In contrast to recent minima, it displayed low sunspot numbers, a delayed new-cycle activity, weak polar magnetic fields, and smaller polar coronal holes with less open flux.
Yet X-ray images of the Sun taken by the Japanese Yohkoh satellite show that the polar coronal holes were no closer to the equator than 60 [degrees] at the time, so the streamer belt near the surface of the Sun should have been much wider, roughly 120 [degrees] in latitude.
Phillips and others at Los Alamos National Laboratory traced the fast stream back to an equatorward extension of the southern polar coronal hole. The slower wind originated in the so-called coronal streamer belt that encircles the Sun's magnetic equator.