Thompson, R. J. <br/><br/>
Recurrent geomagnetic disturbances in 53 years of Ap indices / 
R.J. Thompson 
 - Darlinghurst :  IPS Radio and Space Services,  1985 
 - i, 20p. :  ill. 
 - Technical report /  TR-85-06 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Magnetism, Terrestial