<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=iso-8859-1"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
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</o:shapelayout></xml><![endif]--></head><body lang=PT link=blue vlink=purple><div class=WordSection1><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><img width=750 height=563 id="Imagem_x0020_1" src="cid:image001.jpg@01CD640D.84108500" alt="Descrição: http://www.dxbrasil.net/wp/wp-content/uploads/2012/07/532572_296245257140442_539201452_n.jpg"></span><span lang=PT-BR style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p><p class=MsoNormal><span lang=PT-BR style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>Não é preciso ser <i>expert </i>em propagação para entender o gráfico acima. Este é o gráfico do Índice K, gerado a cada 3 horas a partir da medição da atividade geomagnética em estações terrestres. O K representa o distúrbio do componente horizontal do campo magnético da Terra. O índice K é uma escala para o chamado “ak” que varia entre 0 e 400, de acordo com a tabela abaixo</span><span lang=PT-BR style='font-size:9.0pt;font-family:"Verdana","sans-serif";mso-fareast-language:PT'>:</span><span lang=PT-BR style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p><p class=MsoNormal><span lang=PT-BR style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p> </o:p></span></p><table class=MsoNormalTable border=0 cellspacing=3 cellpadding=0 width=625 style='width:375.0pt'><tr><td width="9%" style='width:9.0%;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:13.5pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>K</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p></td><td width="9%" style='width:9.0%;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:13.5pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>0</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p></td><td width="9%" style='width:9.0%;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:13.5pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>1</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p></td><td width="9%" style='width:9.0%;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:13.5pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>2</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p></td><td width="9%" style='width:9.0%;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:13.5pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>3</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p></td><td width="9%" style='width:9.0%;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:13.5pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>4</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p></td><td width="9%" style='width:9.0%;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:13.5pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>5</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p></td><td width="9%" style='width:9.0%;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:13.5pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>6</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p></td><td width="9%" style='width:9.0%;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:13.5pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>7</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p></td><td width="10%" style='width:10.0%;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:13.5pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>8</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p></td><td width="11%" style='width:11.0%;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:13.5pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>9</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p></td></tr><tr><td style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:13.5pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>ak</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p></td><td style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:13.5pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>0</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p></td><td style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:13.5pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>3</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p></td><td style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:13.5pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>7</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p></td><td style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:13.5pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>15</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p></td><td style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:13.5pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>27</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p></td><td style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:13.5pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>48</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p></td><td style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:13.5pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>80</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p></td><td style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:13.5pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>140</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p></td><td style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:13.5pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>240</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p></td><td style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:13.5pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>400</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p></td></tr></table><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=PT-BR style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>Infelizmente o Índice K atrapalhou um pouco o fim-de-semana no rádio (15/16 de Julho), principalmente os participantes que esperavam bons contatos nas bandas altas (10,15 e 20m). O K acima de 4 gera os chamados “blackout” ou apagões em HF e mais fortemente acima de 10MHz.<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=PT-BR style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'>Fonte: © 2012, <a href="http://www.dxbrasil.net/wp"><span style='color:blue'>DXBrasil</span></a>. Alguns direitos reservados. </span><a href="http://www.dxbrasil.net/wp/dxbrasil/licenciamento-do-nosso-contedo/" target="_blank"><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:blue;mso-fareast-language:PT;text-decoration:none'><img border=0 width=56 height=19 id="Imagem_x0020_2" src="cid:image002.png@01CD640D.84108500" alt="Descrição: Licença Creative Commons"></span></a><span lang=PT-BR style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT'><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>