[1] In 2011, Hill's research, which had used helioseismography to monitor streams below the surface of the Sun, attracted considerable media attention.
[2] The study in question therefore suggested that the sunspot cycle was going to take longer than expected to reach its next peak, or, according to Hill, might not happen at all.
[3][4] Although Hill and his colleagues refused to discuss the possible effects this weaker solar cycle would have on climate,[5] this was reported on by some media, including the Global Warming Policy Foundation, as evidence that a "mini ice age" was imminent.
"[6] In an NSO press release, Hill added that "In my opinion, it is a huge leap from that to an abrupt global cooling, since the connections between solar activity and climate are still very poorly understood.
My understanding is that current calculations suggest only a 0.3 degree C decrease from a Maunder-like minimum, too small for an ice age.