{"id":515,"date":"2009-06-26T20:52:31","date_gmt":"2009-06-27T03:52:31","guid":{"rendered":"https:\/\/www.wkiri.com\/today\/?p=515"},"modified":"2009-06-26T20:54:50","modified_gmt":"2009-06-27T03:54:50","slug":"radio-emissions-from-jupiter-and-other-large-planets","status":"publish","type":"post","link":"https:\/\/www.wkiri.com\/today\/?p=515","title":{"rendered":"Radio emissions from Jupiter&#8230; and other large planets"},"content":{"rendered":"<p><img decoding=\"async\" class=floatRight width=150 src=\"http:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/e\/e2\/Jupiter.jpg\/240px-Jupiter.jpg\">Tune to the right radio frequency, and you can listen to Jupiter!  Electrons passing through Jupiter&#8217;s magnetic field are accelerated and give off radio waves, a process called <a href=\"http:\/\/en.wikipedia.org\/wiki\/Cyclotron_radiation\">cyclotron radiation<\/a>.  The intensity varies with Jupiter&#8217;s longitude, and careful tracking of the radio waves has enabled a more precise estimate of Jupiter&#8217;s rotation period (previously estimated based on cloud features, which naturally are not stationary).  NASA&#8217;s <a href=\"http:\/\/radiojove.gsfc.nasa.gov\/\">Radio Jove<\/a> project encourages teachers, students, amateurs (and you) to listen in to Jupiter&#8217;s &#8220;broadcasts.&#8221;  Here are examples of the two main radio burst types you might hear:<\/p>\n<blockquote>\n<ul>\n<li><a href=\"http:\/\/www.radiosky.com\/lbursts.wav\">L (long) burst<\/a> from Jupiter\n<li><a href=\"http:\/\/www.radiosky.com\/sbursts.wav\">S (short) burst<\/a> from Jupiter\n<\/ul>\n<\/blockquote>\n<p>The frequency of the radio waves is proportional to the strength of the magnetic field.  <a href=\"http:\/\/radiojove.gsfc.nasa.gov\/library\/sci_briefs\/decametric.htm\">Jupiter&#8217;s frequency varies between 10 and 40 MHz<\/a>, yielding &#8220;decametric&#8221; waves (where the wavelength is measured in tens of meters).  Other planets would have different frequencies.  In fact, there&#8217;s an ongoing effort to determine if we can detect known exoplanets via radio observations (with <a href=\"http:\/\/lofar.org\/p\/geninfo.htm\">LOFAR<\/a> or <a href=\"http:\/\/www.skatelescope.org\/\">SKA<\/a>)&#8212;and if so, then add this to the growing list of <a href=\"http:\/\/en.wikipedia.org\/wiki\/Methods_of_detecting_extrasolar_planets\">exoplanet detection techniques<\/a>.  As of today, we&#8217;re up to 353 exoplanets discovered&#8230; with more coming every day.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tune to the right radio frequency, and you can listen to Jupiter! Electrons passing through Jupiter&#8217;s magnetic field are accelerated and give off radio waves, a process called cyclotron radiation. The intensity varies with Jupiter&#8217;s longitude, and careful tracking of the radio waves has enabled a more precise estimate of Jupiter&#8217;s rotation period (previously estimated [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[36],"tags":[],"_links":{"self":[{"href":"https:\/\/www.wkiri.com\/today\/index.php?rest_route=\/wp\/v2\/posts\/515"}],"collection":[{"href":"https:\/\/www.wkiri.com\/today\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wkiri.com\/today\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wkiri.com\/today\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wkiri.com\/today\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=515"}],"version-history":[{"count":9,"href":"https:\/\/www.wkiri.com\/today\/index.php?rest_route=\/wp\/v2\/posts\/515\/revisions"}],"predecessor-version":[{"id":523,"href":"https:\/\/www.wkiri.com\/today\/index.php?rest_route=\/wp\/v2\/posts\/515\/revisions\/523"}],"wp:attachment":[{"href":"https:\/\/www.wkiri.com\/today\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=515"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wkiri.com\/today\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=515"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wkiri.com\/today\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=515"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}