document.write('<br>\nWINLINK Exercise for week 05/18/2026.  Please reply using a ICS-213 message form to K7ACT.<br>\n<br>\nWhat does the \"K-index\" indicate? <br>\nA. The relative position of sunspots on the surface of the sun. <br>\nB. The short term stability of the Earth\'s magnetic field. <br>\nC. The stability of the Sun\'s magnetic field. <br>\nD. The solar radio flux at Boulder, Colorado. <br>\n\n <br>\n\n');