{"id":470,"date":"2009-05-03T13:38:56","date_gmt":"2009-05-03T13:38:56","guid":{"rendered":"http:\/\/perezmedia.net\/beltofvenus\/2009\/05\/03\/solar_h-alpha_m\/"},"modified":"2021-11-28T01:21:39","modified_gmt":"2021-11-28T01:21:39","slug":"solar_h-alpha_m","status":"publish","type":"post","link":"https:\/\/perezmedia.net\/beltofvenus\/2009\/05\/03\/solar_h-alpha_m\/","title":{"rendered":"Solar H-Alpha: MAY 3, 2009 &#8211; 18:30 UT"},"content":{"rendered":"<div class=\"imageblock\"><a href=\"http:\/\/www.perezmedia.net\/beltofvenus\/archives\/images\/2009\/img2009050301_Solarlg.jpg\" onmouseover=\"rollover('img2009050301')\" onmouseout=\"rollout('img2009050301')\"><img decoding=\"async\" src=\"http:\/\/www.perezmedia.net\/beltofvenus\/archives\/images\/2009\/img2009050301_SolarA.jpg\" name=\"img2009050301\" alt=\"Solar H-Alpha Sketch - MAY 03, 2009 - 18:30 UT\"><\/a><br \/>\n<script type=\"text\/javascript\"><br \/>\n<!--\nsetrollover(\"http:\/\/www.perezmedia.net\/beltofvenus\/archives\/images\/2009\/img2009050301_SolarB.jpg\");\n\/\/--><br \/>\n<\/script><\/p>\n<p class=\"caption\">H-Alpha Solar Sketch<\/p>\n<p><i>Move mouse over sketch above to view labels<br \/>\nClick image for larger version.<\/i><\/p>\n<\/div>\n<p><b>Observation Notes:<\/b><\/p>\n<p>The solar limb extruded a fantastic prominence today at PA 210 degrees. It took the shape of a calligrapher&#8217;s X, or perhaps something like a Cretaceous claw reaching over from the Sun&#8217;s far side. I measured it at 1.3\/31.2 solar diameters in height, or 58,000 km (36,000 miles). It&#8217;s pretty awesome to consider 5 earths could be stacked along its length. Several other gouts of plasma levitated over the solar limb. One in particular at about PA 220 degrees looked like it might form a loop with two bright spots beneath it; however I was only able to spot a brighter segment of the arc. The limb otherwise steadied enough at times to give the impression of sharp, faint, thorny protrusions everywhere. These can&#8217;t be spicules, so I need to figure out what they actually are.<\/p>\n<p>Edit &#8211; MAY 04, 2005: Alan Friedman posted images he shot of the same prominence at the same time I was making this observation. So I was able to get some photoglaphic feedback on the sketch:<\/p>\n<p style=\"text-align: center\"><img decoding=\"async\" src=\"http:\/\/www.perezmedia.net\/beltofvenus\/archives\/images\/2009\/img2009050302_SolarComp.jpg\" alt=\"Comparison photograph and sketch of solar prominence - MAY 3, 2009 - 18:45 UT\"><br \/>\n<i>Comparison of photographic and visual sketch of prominence<br \/>\nMAY 3, 2009 &#8211; 18:45 UT<br \/>\nPhoto posted with permission of Alan Friedman.<\/i><\/p>\n<p>I obviously didn&#8217;t catch the finer detail, but the broad details seem to match up fairly well. Be sure to have a look at the excellent astrophotography at Alan&#8217;s site: <a href=\"http:\/\/www.avertedimagination.com\/\" target=\"_blank\" rel=\"noopener\">Averted Imagination<\/a>.<\/p>\n<table class=\"objectdata\">\n<tbody>\n<tr>\n<td><b>Subject<\/b><\/td>\n<td class=\"subject\">Solar H-Alpha<\/td>\n<\/tr>\n<tr>\n<td><b>Sunspots<\/b><\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td><b>Sunspot Groups<\/b><\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td><b>Date\/Time<\/b><\/td>\n<td>MAY 03, 2009 11:30 &#8211; 11:50 AM MST<br \/>\n(MAY 03, 2009 18:30 &#8211; 18:50 UT<\/td>\n<\/tr>\n<tr>\n<td><b>Observing Loc.<\/b><\/td>\n<td>Flagstaff, AZ &#8211; Home<\/td>\n<\/tr>\n<tr>\n<td><b>Instrument<\/b><\/td>\n<td>Coronado PST &#8211; 40 mm f\/10<\/td>\n<\/tr>\n<tr>\n<td><b>Eyepieces\/Mag.<\/b><\/td>\n<td>Pentax XW 10 (40X); Meade Astrometric Eyepiece (33X)<\/td>\n<\/tr>\n<tr>\n<td><b>Conditions<\/b><\/td>\n<td>Few Clouds, Breezy<\/td>\n<\/tr>\n<tr>\n<td><b>Seeing<\/b><\/td>\n<td>Ant. III<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>Solar 2009050301<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[97,15,98],"tags":[],"class_list":["post-470","post","type-post","status-publish","format-standard","hentry","category-sg-solar","category-sketch-gallery","category-solar"],"jetpack_featured_media_url":"","jetpack-related-posts":[{"id":498,"url":"https:\/\/perezmedia.net\/beltofvenus\/2009\/10\/25\/solar_h-alpha_o\/","url_meta":{"origin":470,"position":0},"title":"Solar H-Alpha: OCT 25, 2009 &#8211; 21:00 UT","author":"jperez1690","date":"October 25, 2009","format":false,"excerpt":"Solar 2009102501","rel":"","context":"In &quot;SG-Solar&quot;","block_context":{"text":"SG-Solar","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/sg-solar\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":489,"url":"https:\/\/perezmedia.net\/beltofvenus\/2009\/09\/27\/solar_h-alpha_s\/","url_meta":{"origin":470,"position":1},"title":"Solar H-Alpha: SEP 27, 2009 &#8211; 21:15 UT","author":"jperez1690","date":"September 27, 2009","format":false,"excerpt":"Solar 2009092701","rel":"","context":"In &quot;SG-Solar&quot;","block_context":{"text":"SG-Solar","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/sg-solar\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":467,"url":"https:\/\/perezmedia.net\/beltofvenus\/2009\/04\/23\/h-alpha_solar_a\/","url_meta":{"origin":470,"position":2},"title":"Solar H-Alpha: APR 24, 2009 &#8211; 00:55 UT","author":"jperez1690","date":"April 23, 2009","format":false,"excerpt":"Solar 2009042301","rel":"","context":"In &quot;SG-Solar&quot;","block_context":{"text":"SG-Solar","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/sg-solar\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":574,"url":"https:\/\/perezmedia.net\/beltofvenus\/2011\/07\/28\/drawn_to_the_un_23\/","url_meta":{"origin":470,"position":3},"title":"Drawn to the UniverseJUNE 2011 &#8211; H-Alpha Solar","author":"jperez1690","date":"July 28, 2011","format":false,"excerpt":"H-Alpha Sketch of SunClick image to view larger version. Subject:H-Alpha Sun Issue:June 2011 Astronomy Now Basic Media:Graphite and erasers white stock Featured Technique:Preparing an H-Alpha Solar Sketch that captures surface features and prominences along the limb. Suggested Sketching Materials: Clipboard and acid-free drawing paper HB and 2H graphite pencils Charcoal\u2026","rel":"","context":"In &quot;Article&quot;","block_context":{"text":"Article","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/article\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":584,"url":"https:\/\/perezmedia.net\/beltofvenus\/2012\/05\/22\/annular_solar_e\/","url_meta":{"origin":470,"position":4},"title":"Annular Solar Eclipse &#8211; Monument Valley &#8211; May 20, 2012","author":"jperez1690","date":"May 22, 2012","format":false,"excerpt":"The annular eclipse that skidded out of Asia, across the Pacific and into the Western US put on a great show Sunday afternoon. 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