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The Dunn Solar Telescope, also known as the Richard B. Dunn Solar Telescope, [ 1] is a unique vertical-axis solar telescope that specializes in high-resolution imaging and spectroscopy. It is located at Sacramento Peak in Sunspot, New Mexico. It is the main telescope at the Sunspot Solar Observatory, operated by New Mexico State University in ...
1964 [7] San Diego State University (SDSU) is a public research university in San Diego, California. Founded in 1897, it is the third-oldest university and southernmost in the 23-member California State University (CSU) system. SDSU is the oldest higher education institution in San Diego; its academic roots were established as a normal school ...
Sunspot number is correlated with the intensity of solar radiation over the period since 1979, when satellite measurements became available. The variation caused by the sunspot cycle to solar output is on the order of 0.1% of the solar constant (a peak-to-trough range of 1.3 W·m −2 compared with 1366 W·m −2 for the average solar constant).
Sunspot AR3664 has been growing over the past few days and is roughly 124,000 miles across-more than 15 times wider than the Earth. A sunspot this large is easy enough to see from Earth; all that ...
List of solar cycles. Solar cycles are nearly periodic 11-year changes in the Sun 's activity that are based on the number of sunspots present on the Sun's surface. The first solar cycle conventionally is said to have started in 1755. The source data are the revised International Sunspot Numbers (ISN v2.0), as available at SILSO. [1]
Solar cycle 25 is the current solar cycle, the 25th since 1755, when extensive recording of solar sunspot activity began. It began in December 2019 with a minimum smoothed sunspot number of 1.8. [2] It is expected to continue until about 2030. [3][4]
Sunspot and infrared spectral line measurements made in the latter part of the first decade of the 2000s suggested that sunspot activity may again be disappearing, possibly leading to a new minimum. [48] From 2007 to 2009, sunspot levels were far below average. In 2008, the Sun was spot-free 73 percent of the time, extreme even for a solar minimum.
The history of San Diego State University began in the late 19th century with the establishment of a normal school in San Diego, California. Founded on March 13, 1897, the school opened on November 1, 1898, with a class of 135 students. By 1921, the school had become San Diego State Teachers College, allowing it to grant certificates and degrees.