{"id":3306,"date":"2021-10-01T19:41:23","date_gmt":"2021-10-01T18:41:23","guid":{"rendered":"http:\/\/www.popastro.com\/main_spa1\/solar\/?page_id=3306"},"modified":"2021-10-01T19:49:03","modified_gmt":"2021-10-01T18:49:03","slug":"solar-highlights-for-august-21","status":"publish","type":"page","link":"https:\/\/www.popastro.com\/solar\/solar-highlights-for-august-21\/","title":{"rendered":"Solar Highlights for August 21"},"content":{"rendered":"

Solar Rotation Nos: 2246 to 2247<\/p>\n

Overall, there was a decrease in sunspot activity this month. We saw mostly small spots and pores particularly on the 15th when several suddenly popped-up in one day! The exception to this trend was AR2860, which quickly developed into an active extensive sunspot group after it first appeared on the 25th.<\/p>\n

There was, however, frequent cloudy weather throughout much of August which impacted observations.<\/p>\n

Here are the solar highlights for August 2021 together with a selection of images.<\/p>\n

Sunspots<\/strong><\/p>\n

The Sun was spotless on the 1st.<\/p>\n

AR2850<\/strong> appeared on the 2nd near the southwest limb at the high southern latitude of -32\u00b0, type Cro. Being close to the limb it disappeared over it on the 6th.<\/p>\n

AR2851<\/strong> came into view near the Central Meridian (CM) on the 6th at +15\u00b0, type Bxo, it lasted a single day.<\/p>\n

AR2852<\/strong> appeared near the CM on the 6th at -11\u00b0, type Bxo, it too lasted just one day.<\/p>\n

The Sun was spotless on the 7th.<\/p>\n

AR2853<\/strong> came over the northeast limb at latitude +23\u00b0 on the 9th. Short-lived it seems to have just survived until the 16th.<\/p>\n

AR2854<\/strong> came into view on the 12th at -21\u00b0. This was a tiny single Axx type spot\/pore that had disappeared the following day.<\/p>\n

AR2855<\/strong> was another single Axx spot\/pore that appeared on the 12th but on the northern hemisphere at +13\u00b0. It disappeared after the 13th.<\/p>\n

The Sun was spotless on the 14th.<\/p>\n

AR2856<\/strong> appeared on the 15th at +14\u00b0. It went over the west limb around the 17th.<\/p>\n

AR2857<\/strong> also appeared on the 15th at latitude +18\u00b0. It disappeared after the 18th.<\/p>\n

AR2858<\/strong> popped into view near the CM at +12\u00b0 on the 19th. It remained visible until the 23rd.<\/p>\n

AR2859<\/strong> came over the northeast limb on the 22nd at latitude +20\u00b0, type Cao, and was minor solar flare active around the 26th. It remained visible up to the end of the month.<\/p>\n

\"2021
2021 August 23 @1247-1409UT White Light, Calcium H and Ha AR2859. Images by Carl Bowron.<\/figcaption><\/figure>\n

AR2860<\/strong> came over the southeast limb on the 25th at -28\u00b0, starting off as a type Bxo initially it increased in size and complexity over the following 2-3 days. By the time it reached the CM on the 28th, it was type Eki, and was multiple solar flare active. It remained visible right up until the end of the month.<\/p>\n

\"2021
2021 August 28 @0842-0945UT White Light, Calcium H and Ha AR2860. Images by Carl Bowron.<\/figcaption><\/figure>\n

AR2861<\/strong> appeared near the east limb on the 27th at +15\u00b0 but was gone by the 30th.<\/p>\n

AR2862<\/strong> appeared near the southwest limb at -28\u00b0 on the 28th, it had disappeared by the 30th.<\/p>\n

SPA Sunspot Mean Daily Frequency: 0.80 (was 1.95)<\/strong>
\nRelative Sunspot Number: 12.68 (was 27.17)<\/strong><\/p>\n

Solar Prominences, Plage, Filaments and Flares<\/strong><\/p>\n

Several small prominences were seen throughout the month with two exceptions.<\/p>\n

A tall extensive hedgerow type prominence was seen on the northeast limb on the 14th. It persisted quite a long time right up until the 16th though becoming quite a bit smaller by then.<\/p>\n

Another extensive hedgerow prominence was seen on the west limb on the 28th.<\/p>\n

\"2021
2021 August 27 @1325UT Ha disc drawing by Ian Lee.<\/figcaption><\/figure>\n
\"2021
2021 August 28 @1015UT Ha disc drawing by Ian Lee.<\/figcaption><\/figure>\n

Filaments were frequent on the southern hemisphere throughout the month. Some were long and elaborate in nature.<\/p>\n

Bright plage were seen around most of the sunspots though some plage were seen in isolation too. Widespread plage were visible with AR2859 and AR2860 towards the end of the month.<\/p>\n

 <\/p>\n

SPA Prominence Mean Daily Frequency: 3.33 (was 2.36)<\/strong><\/p>\n

Congratulations to Alan Heath who observed 26 days and to Michael Fullerton who observed 24 days and Jonathan Shanklin on 23 days.<\/p>\n

Detailed count records of Active Regions and Relative Sunspot Numbers came from: John Chapman-Smith, Michael Fullerton, Alan Heath, Ian Lee, Lee Macdonald, Jonathan Shanklin, Brendan Shaw and Bob Steele.<\/p>\n

Images and drawings were supplied by: Carl Bowron, John Fathers, Ian Lee and Cliff Meredith.<\/p>\n

Geoff Elston<\/p>\n","protected":false},"excerpt":{"rendered":"

Solar Rotation Nos: 2246 to 2247 Overall, there was a decrease in sunspot activity this month. We saw mostly small spots and pores particularly on the 15th when several suddenly popped-up in one day! The exception to this trend wasRead more<\/span><\/a><\/p>\n","protected":false},"author":17,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[],"tags":[],"class_list":["post-3306","page","type-page","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t