Cometary Cascades appear to be associated with periods of cooling in the last millennium.
Comet Shoemaker–Levy 9
21 fragments of Comet Shoemaker–Levy 9 collided with Jupiter in 1994.
The disintegration of Comet Shoemaker–Levy 9 illustrates a Cometary Cascade whereby the number of cometary fragments exponentially increases while the overall disintegration process accelerates because the total surface area of the remnants is [also] exponentially increasing.
The Kreutz Cometary Cascade
The mainstream is piecing together the history of the Kreutz Cometary Cascade.
The Kreutz sungrazers are a family of sungrazing comets, characterized by orbits taking them extremely close to the Sun at perihelion.
Many hundreds of smaller members of the family, some only a few meters across, have been discovered since the launch of the SOHO satellite in 1995.
The mainstream suggests the current Kreutz Cometary Cascade of “over 3000 small sungrazing comets” probably began sometime around 326 CE with a 150 km diameter comet.
By far the best candidate for the progenitor comet was that seen in 1106 (Great Comet of 1106): Ikeya–Seki’s derived orbital period gave a previous perihelion almost exactly at the right time, and while the Great Comet of 1882’s derived orbit implied a previous perihelion a few decades later, it would only require a small error in the orbital elements to bring it into agreement.
Comet Ikeya–Seki … was seen to break into three pieces just before its perihelion passage. … is a member of the Kreutz sungrazers, which are suggested to be fragments of a large comet which broke up in 1106.
… the Great Comet of 1106 … was observed to split into many pieces, forming the Great Comet of 1843, Great Comet of 1882, Comet Pereyra, Comet Ikeya–Seki and C/2011 W3 (Lovejoy), as well as over 3000 small sungrazing comets observed by the SOHO space telescope.
It is a member of the Kreutz Group, known as Subfragment I, a split from an earlier large (~150 km) comet that progressively fragmented under influence of the Sun.
The mainstream is also grappling with three other identified Cometary Cascades.
This is the second largest sungrazing group, and the only one with no discerned period.
This and the Marsden group, both are periodic, both with periods of approximately 3 years.
The History of Cometary Cascades
Whether the mainstream has a good handle on the evolutionary history of Cometary Cascades is debatable because the observational history of comets [before the invention of the telescope in 1608] suggests:
○ Cometary Cascades create repeating bands of cometary observations.
○ The duration of a Cometary Cascade Band increases with fragmentation.
The observational history of meteors and meteor showers from Korea suggests:
○ The Cometary Cascades began in the 1st century CE.
○ Cometary Cascade Bands are clearly identifiable in the 11th century CE.
Climate and Cometary Cascades
The Korean observational history for the 1st millennium makes it difficult to draw any clear conclusion regarding climate because the data is limited to meteor showers.
In the 2nd millennium the debris created by the Cometary Cascade Crescendo appears to be a contributory factor to the series of lower lows in Leona Libby’s Old Japanese Cedar Tree chronology.
The Cometary Cascade Banding during the Maunder Minimum appears to drive the shape of the associated low in Leona Libby’s Old Japanese Cedar Tree chronology.
However, it’s important to remember that correlation doesn’t prove causation and that synchronised attributes in any system may simply reflect a system-wide event.