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Sunspots made a solid reappearance over this reporting week (June 4-10) with average daily sunspot number rising from 3.3 to 14. As expected, solar flux also increased, and the average daily 10.7 cm solar flux rose from 69.6 to 71.3. With renewed solar activity, so many radio amateurs staying home, and the increasing popularity of […] Read more
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A new sunspot is emerging over the sun’s southeastern limb. Provisionally numbered AR2765, it is inset in this magnetic map of the sun’s surface from NASA’s Solar Dynamics Observatory: AR2765 is a member of new Solar Cycle 25. We know this because of its magnetic polarity. According to Hale’s Law, sunspots switch polarities from one solar […] Read more
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No significant solar activity over the past week, and still no sunspots observed since the end of April. According to Spaceweather.com, the percentage of spotless days in 2020 has inched up another notch to 79%. The percentage of days showing no sunspots for all of 2019 was 77%. Average daily solar flux for last week was […] Read more
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Still no sunspots to report. Spaceweather.com reported on May 20 that the current stretch of days with no sunspots has now reached 18. And with that the 2020 percentage of days with no sunspots has risen to 77%, equal to 2019. Until May 15 that statistic stood at 76%. Average daily solar flux for the […] Read more
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No sunspots appeared last week. The previous seven days had only one big sunspot group on one day, with a sunspot number of 35. Over the seven-day period this averaged out to a sunspot number of 5, so average daily sunspot numbers declined from 5 to 0 this week. Average daily solar flux also declined, […] Read more
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99 years ago this week, people around the world woke up to some unusual headlines. “Telegraph Service Prostrated, Comet Not to Blame” — declared the Los Angeles Times on May 15, 1921. “Electrical Disturbance is ‘Worst Ever Known’” — reported the Chicago Daily Tribune. “Sunspot credited with Rail Tie-up” — deadpanned the New York Times. […] Read more
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There were several sunspot appearances this week. Sunspot numbers on April 25-29 were 11, 14, 12, 0 and 24, giving a weekly average of 8.7. Average daily solar flux changed from 69 to 69.2. Geomagnetic activity remains quiet, with average daily planetary A index declining from 7.3 to 5.6. On Thursday, new sunspot activity continued, […] Read more
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Today, there are two sunspots in the sun’s southern hemisphere. Their magnetic polarity reveals something interesting: They come from different solar cycles. Take a look at this magnetic map of the sun’s surface (with sunspots inset) from NASA’s Solar Dynamics Observatory: One sunspot (AR2760) belongs to old Solar Cycle 24, while the other (AR2761) belongs […] Read more
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