To: Eric  who wrote (1522855 ) 2/14/2025 8:11:36 PM From: maceng2  1 RecommendationRecommended By  longz
    Read Replies (3)  | Respond to    of 1569841  From the presentation:  Total solar irradiance (TSI) reduction during Maunder Minimum Let us explore what has happened with the solar irradiance during the previous grand solar minimum – Maunder Minimum. During this period, very few sunspots appeared on the surface of the Sun, and the overall brightness of the Sun was slightly decreased. The reconstruction of the cycle-averaged solar total irradiance back to 1610 (Figure 4, top plot) suggests a decrease of the solar irradiance during Maunder minimum by a value of about 3 W/m2 (Lean et al., 1995), or about 0.22% of the total solar irradiance in 1710 , after the Maunder minimum was over.Temperature decrease during Maunder minimum  From 1645 to 1710, the temperatures across much of the Northern Hemisphere of the Earth plunged when the Sun entered a quiet phase now called the Maunder Minimum. This was likely occurred because the total solar irradiance was reduced by 0.22% shown in Fig. 4 (top plot) (Lean et al, 1995) that led to a decrease of the average terrestrial temperature measured mainly in the Northern hemisphere in Europe by 1.0-1.5 C as shown in Fig. 4 (bottom plot) (Easterbrook, 2016). This seemingly small decrease of the average temperature in the Northern hemisphere led to frozen rivers, cold long winters and cold summers. Figure 4. Top plot: restored total solar irradiance from 1600 until 2014 by Lean et al., 1995. Modified by Easterbrook (2016)  from Lean, J.L., Beer, J., Bradley, R., 1995. Bottom plot: Central England temperatures (CET) recorded continuously since 1658. Blue areas are reoccurring cool periods; red areas are warm periods. All times of solar minima were coincident with cool periods in central England. Adopted from Easterbrook, 2016 with the Elsevier publisher permissions.The surface temperature of the Earth was reduced all over the Globe (see Fig.1 in Shindell et al., 2001), especially, in the countries of Northern hemisphere. Europe and North America went into a deep freeze: alpine glaciers extended over valley farmland; sea ice crept south from the Arctic; Dunab and Thames rivers froze regularly during these years as well as the famous canals in the Netherlands.   Grand solar cycle and minimum – Valentina Zharkova's GSM