Dalton Minimum

Dalton Minimum image

The Dalton minimum in the 400-year history of sunspot numbers

The Dalton Minimum was a period of low sunspot count, representing low solar activity, named after the English meteorologist John Dalton, lasting from about 1790 to 1830 or 1796 to 1820, corresponding to the period solar cycle 4 to solar cycle 7. While the Dalton Minimum is often compared with the Maunder Minimum, its sunspot number was slightly higher and reported sunspots distributed in both solar hemispheres unlike the Maunder Minimum. The coronal streamers are visually confirmed in Ezra Ames and José Joaquin de Ferrer’s eclipse drawings in 1806 and indicates similarity of its magnetic field not with that of the Maunder Minimum but with that of the modern solar cycles.

Contents

Temperature

Like the Maunder Minimum and Spörer Minimum, the Dalton Minimum coincided with a period of lower-than-average global temperatures. During that period, there was a variation of temperature of about 1:°C in Germany.

The cause of the lower-than-average temperatures and their possible relation to the low sunspot count are not well understood. Recent papers have suggested that a rise in volcanism was largely responsible for the cooling trend.

While the Year Without a Summer, in 1816, occurred during the Dalton Minimum, the prime reason for that year's cool temperatures was the highly explosive 1815 eruption of Mount Tambora in Indonesia, which was one of the two largest eruptions in the past 2000 years. One must also consider that the rise in volcanism may have been triggered by lower levels of solar output as there is a weak but statistically significant link between decreased solar output and an increase in volcanism.

See also

Notes

  1. ^ Komitov and Kaftan 2004
  2. ^ Archibald, p. 32
  3. ^ Hayakawa et al. 2020a
  4. ^ Hayakawa et al. 2020b
  5. ^ File:Temperaturreihe Deutsc... ...read more

Solar minimum
4 months ago

Solar minimum ... Solar minimum is the period of least solar activity in the 11-year solar cycle of the Sun. During this time, sunspot and solar flare activity diminishes...

John Dalton
5 months ago

John Dalton ... Collections. Dalton (unit) Dalton Minimum – a period of low solar activity Daltonism Democritus Pneumatic chemistry Dalton believed that his vitreous...

Maunder Minimum
5 months ago

Maunder Minimum ... cosmogenic isotopes; these include the Spörer Minimum (1450–1540), and less markedly the Dalton Minimum (1790–1820). In a 2012 study, sunspot minima have...

1815 eruption of Mount Tambora
4 months ago

1815 eruption of Mount Tambora ... ten times) less. Furthermore, the 1815 eruption occurred during a Dalton Minimum, a period of unusually low solar radiation. Volcanism plays a large...

Year Without a Summer
5 months ago

Year Without a Summer ... the end of the Little Ice Age. This period also occurred during the Dalton Minimum (a period of relatively low solar activity), specifically Solar Cycle...

1811–1812 New Madrid earthquakes
5 months ago

1811–1812 New Madrid earthquakes ... printing.) "A New Dalton Minimum?". Retrieved October 13, 2019. "A New Dalton Minimum?". Retrieved October 13, 2019. "A New Dalton Minimum?". Retrieved October...

Solar maximum
5 months ago

Solar maximum ... 8220 BC, 9170 BC. There was also the maunder minimum 1645 to 1715. Solar wind Solar variation Solar minimum List of solar cycles – table of solar cycles...

Solar cycle
5 months ago

Solar cycle ... years. Solar maximum and solar minimum refer to periods of maximum and minimum sunspot counts. Cycles b from one minimum to the next. Sunspots were first...

Spörer Minimum
5 months ago

Spörer Minimum ... The Spörer Minimum is a hypothesized 90-year b of low solar activity, from about 1460 until 1550, which was identified and named by John A. Eddy in...

Solar cycle 6
4 months ago

Solar cycle 6 ... beginning in August 1810 and ending in May 1823 (thus falling within the Dalton Minimum). The maximum smoothed sunspot number (SIDC formula) observed during...

List of articles related to the Sun
4 months ago
List of periods and events in climate history
4 months ago
Solar cycle 5
4 months ago
Solar cycle 14
4 months ago
Solar cycle 4
4 months ago
Little Ice Age
6 months ago
Gnevyshev-Ohl rule
4 months ago
Nuclear winter
6 months ago
Solar cycle 7
4 months ago
This article is copied from an article on Wikipedia® - the free encyclopedia created and edited by its online user community. This article is distributed under the terms of GNU Free Documentation License.