{"id":28182,"date":"2017-09-08T06:20:34","date_gmt":"2017-09-08T10:20:34","guid":{"rendered":"https:\/\/swling.com\/blog\/?p=28182"},"modified":"2017-09-08T06:20:34","modified_gmt":"2017-09-08T10:20:34","slug":"hf-radio-blackouts-in-wake-of-solar-flares","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2017\/09\/hf-radio-blackouts-in-wake-of-solar-flares\/","title":{"rendered":"HF Radio blackouts in wake of solar flares"},"content":{"rendered":"<div id=\"attachment_28184\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/swling.com\/blog\/wp-content\/uploads\/2017\/09\/GeoStormForecast-e1504865980755.jpeg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-28184\" class=\"wp-image-28184 size-full\" src=\"https:\/\/swling.com\/blog\/wp-content\/uploads\/2017\/09\/GeoStormForecast-e1504865980755.jpeg\" alt=\"\" width=\"800\" height=\"452\" \/><\/a><p id=\"caption-attachment-28184\" class=\"wp-caption-text\">(Image Source: NASA)<\/p><\/div>\n<p>(Source: <a href=\"http:\/\/www.arrl.org\/news\/solar-flares-spark-radio-blackouts-auroral-displays-possible\" target=\"_blank\" rel=\"noopener\">ARRL<\/a> via Mike Terry)<\/p>\n<blockquote><p>NOAA\u2019s Space Weather Prediction Center (SWPC) has issued a strong (G3) geomagnetic storm watch for September 7 through September 9. The SWPC said the watch for September 7 remains in effect due to the arrival of a coronal mass ejection (CME) and the effects of a CME on September 4.<\/p>\n<p>\u201cAdditionally, a G3 watch is now in effect for the 8 and 9 September UTC days in anticipation of the arrival of another CME associated with the X9.3 flare (R3 \u2014 strong radio blackout) on 6 September at 1202 UTC (0802 ET),\u201d the SWPC said early on September 7. \u201cAnalysis indicates likely CME arrival late on 8 September into early 9 September.\u201d The September 6 flare is being called the strongest in more than a decade.<\/p>\n<p>Its effect on HF radio propagation has adversely affected the Hurricane Watch Net (HWN), currently operating on 20 and 40 meters as Hurricane Irma sweeps through the Caribbean.<br \/>\nAs of September 7 at 1400 UTC, the solar flux index stood at 127, the sunspot number at 27, the A index at 11, and the K index at 4. All HF conditions are being deemed as no better than fair. The possibility of extended auroral displays could work to the benefit of VHF and UHF operators who aim their antennas north to take advantage of \u201cbuzz\u201d mode. SWPC posts a 30-minute forecast of visible aurora.[&#8230;]<\/p><\/blockquote>\n<p style=\"text-align: center;\"><a href=\"http:\/\/www.arrl.org\/news\/solar-flares-spark-radio-blackouts-auroral-displays-possible\" target=\"_blank\" rel=\"noopener\">Click here to read the full article at the ARRL.<\/a><\/p>\n<p>Also, check out Tamitha Skov&#8217;s forecast <a href=\"https:\/\/youtu.be\/oMAl5b5cXm0\" target=\"_blank\" rel=\"noopener\">on YouTube<\/a>:<\/p>\n<p><span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"625\" height=\"352\" src=\"https:\/\/www.youtube.com\/embed\/oMAl5b5cXm0?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=en-US&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox\"><\/iframe><\/span><\/p>\n<p>Last night, I tested a couple of HF radios and all but the strongest shortwave broadcasters (WRMI, RHC) were wiped out. Even the strong stations sounded like weak DX. This is truly an HF blackout.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>(Source: ARRL via Mike Terry) NOAA\u2019s Space Weather Prediction Center (SWPC) has issued a strong (G3) geomagnetic storm watch for September 7 through September 9. The SWPC said the watch for September 7 remains in effect due to the arrival of a coronal mass ejection (CME) and the effects of a CME on September 4. [&hellip;]<\/p>\n","protected":false},"author":15,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[545,3,43,810],"tags":[2011,809,808,1126,4107,6394],"class_list":["post-28182","post","type-post","status-publish","format-standard","hentry","category-ham-radio","category-news","category-shortwave-radio","category-space-weather","tag-arrl","tag-cme","tag-coronal-mass-ejections","tag-solar-flares","tag-space-weather","tag-tamitha-skov"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pn3uc-7ky","jetpack-related-posts":[{"id":6805,"url":"https:\/\/swling.com\/blog\/2013\/06\/geomagnetic-storms-in-weekend-forecast\/","url_meta":{"origin":28182,"position":0},"title":"Geomagnetic storms in weekend forecast","author":"Thomas","date":"June 29, 2013","format":false,"excerpt":"Heads up! Geomagnetic storms may make it a challenge to hear the test broadcast of Hamburger Lokalradio this weekend or any shortwave broadcaster for that matter. Full details at Spaceweather.com and the ARRL (below): (Source: ARRL) Spaceweather.com\u00a0reports a strong geomagnetic storm is in progress as Earth passes through a region\u2026","rel":"","context":"In &quot;News&quot;","block_context":{"text":"News","link":"https:\/\/swling.com\/blog\/category\/news\/"},"img":{"alt_text":"(Source: SpaceWeather.com)","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2012\/01\/CMEm9-300x300.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":2645,"url":"https:\/\/swling.com\/blog\/2012\/01\/large-coronal-mass-ejection-cme-to-hit-earth-january-24th\/","url_meta":{"origin":28182,"position":1},"title":"Large Coronal Mass Ejection (CME) to hit earth January 24th","author":"Thomas","date":"January 23, 2012","format":false,"excerpt":"CME's have a very negative effect on shortwave radio. This particular CME\u00a0is the largest to hit earth in 7 years--certain high-flying airplanes may even be re-routed. On the positive note, the strong ensuing geo-magnet storms should create some beautiful aurorasin northern latitudes. More details: (Source: Space Weather) The Solar and\u2026","rel":"","context":"In &quot;Current Events&quot;","block_context":{"text":"Current Events","link":"https:\/\/swling.com\/blog\/category\/current-events\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2012\/01\/CMEm9-300x300.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":51730,"url":"https:\/\/swling.com\/blog\/2022\/02\/february-2-2021-a-low-hazard-cme-could-bring-auroras-to-low-latitudes-and-affect-hf-propagation\/","url_meta":{"origin":28182,"position":2},"title":"February 2, 2022: A low-hazard CME could bring auroras to low latitudes and affect HF propagation","author":"Thomas","date":"February 1, 2022","format":false,"excerpt":"Many thanks to SWLing Post contributor, Ed, who shares the following news from Spaceweather.com: GEOMAGNETIC STORM WATCH: A coronal mass ejection (CME) is heading for Earth. Estimated time of arrival: Feb. 2nd. This movie from SOHO shows the halo CME leaving the sun: It was hurled into space during the\u2026","rel":"","context":"In &quot;Ham Radio&quot;","block_context":{"text":"Ham Radio","link":"https:\/\/swling.com\/blog\/category\/ham-radio\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2022\/02\/CME-1.jpeg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":2650,"url":"https:\/\/swling.com\/blog\/2012\/01\/npr-explains-space-weather-and-the-cme-heading-our-way\/","url_meta":{"origin":28182,"position":3},"title":"NPR explains space weather and the CME heading our way","author":"Thomas","date":"January 24, 2012","format":false,"excerpt":"I think this is one of the best, simple explanations of space weather that I've seen lately: (Source: NPR) Space weather, as it is called, originates with solar magnetic activity. The sun is a giant spinning ball of charged particles. In addition to its spin, the heat released from the\u2026","rel":"","context":"In &quot;News&quot;","block_context":{"text":"News","link":"https:\/\/swling.com\/blog\/category\/news\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2012\/01\/CMEm9-300x300.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":58468,"url":"https:\/\/swling.com\/blog\/2023\/12\/x2-8-class-solar-flare-strongest-of-this-solar-cycle\/","url_meta":{"origin":28182,"position":4},"title":"X2.8-Class Solar Flare: Strongest of this solar cycle","author":"Thomas","date":"December 15, 2023","format":false,"excerpt":"Many thanks to SWLing Post Contributor, Troy Riedel, who shares the following news via Spaceweather.com: (UPDATED) STRONGEST FLARE OF THE CURRENT SOLAR CYCLE: Sunspot 3514 erupted on Dec. 14th (1702 UT), producing a strong X2.8-class solar flare. This is the strongest flare of Solar Cycle 25 (so far) and the\u2026","rel":"","context":"In &quot;News&quot;","block_context":{"text":"News","link":"https:\/\/swling.com\/blog\/category\/news\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/12\/lopsidedhalo_dice_opt.gif?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":59351,"url":"https:\/\/swling.com\/blog\/2024\/03\/a-large-cme-could-bring-g3-class-geomagnetic-storms\/","url_meta":{"origin":28182,"position":5},"title":"A large CME could bring G3-class geomagnetic storms","author":"Thomas","date":"March 23, 2024","format":false,"excerpt":"Many thanks to SWLing Post contributor, Troy Riedel, who shares the following news from Spaceweather.com: A BIG CME IS COMING:\u00a0This morning's X1-class solar flare hurled a bright CME toward Earth. NASA\u00a0and\u00a0NOAA models\u00a0agree that the storm cloud should reach our planet by the early hours of March 25th. A direct hit\u2026","rel":"","context":"In &quot;News&quot;","block_context":{"text":"News","link":"https:\/\/swling.com\/blog\/category\/news\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2024\/03\/CME-1.jpeg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/28182","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/users\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/comments?post=28182"}],"version-history":[{"count":0,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/28182\/revisions"}],"wp:attachment":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/media?parent=28182"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/categories?post=28182"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/tags?post=28182"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}