http://www.radio4all.net/series/NW7US%20Space%20Weather%20and%20Radio%20Propagation%20PodcastRadio Project Series: NW7US Space Weather and Radio Propagation PodcastTue, 01 Sep 2009 10:14:22 +0000240http://www.radio4all.net/program/35402Interview with Dr. Penn about research of sunspots and space weather. Trend in data suggests possible disappearing of sunspots by 2015, and mini-ice age conditions. Part One of TwoNW7USTue, 01 Sep 2009 10:14:22 +0000