April 5, 2016: Further to AAVSO Alert Notice 536, close monitoring of the cataclysmic variable SS Cyg is urgently requested. Immediate notification of the beginning of the anticipated outburst is crucial and is requested.
The success of the multiwavelength (radio and optical) observing campaign on SS Cyg underway depends on immediate reporting of outburst behavior to trigger multi-site radio observations.
January 4, 2013: Dr. Bob Zavala (U.S. Naval Observatory, Flagstaff) has requested AAVSO assistance in obtaining multicolor photometry of the bright triple system b Per in order to prepare for and detect a possible eclipse of the AB components by the C component predicted for 2013 January 23. At 4.5V, b Per, which is also a radio source, is an excellent target for photoelectric photometrists and DSLR observers.
September 10, 2011: Dr. Gregory Sivakoff (U. of Alberta) requests observations of the X-ray binary star MAXI J1836-194 as part of the JACPOT collaboration studying stellar radio jets from compact binaries. There is no predetermined duration for this campaign, but observations are requested now to coincide with ongoing X-ray and radio observations.
Starting on Friday, May 13th, the AAVSO will have a section on the radio show "Espacio Profundo Radio", that's on the air every Friday between 20 and 21 GMT. The program is sponsored by Espacio Profundo, one of the most popular astronomy websites in Latin America.
A partir del viernes 13 de mayo, la AAVSO tendrá una sección en el programa Espacio Profundo Radio, que se emite todos los viernes entre las 20 y 21 GMT. El programa es conducido por Cristina Ruffa y auspiciado por Espacio Profundo, una de los sitios web más conocidos en el ámbito latinoamericano.
When the ultraviolet rays from the Sun hit the Earths atmosphere the energy they possess work to knock electrons off of the atoms and molecules that the atmosphere is made up of. These free electrons make up a region of the atmosphere known as the Ionosphere. The region is strongest on the daytime side of the earth since it is dependant on the energy from the solar ultra violet rays.
VERY LOW FREQUENCY (VLF) RADIO STATIONS
Station Station Frequency Radiated
Site ID (kHz) Power
Cutler, ME NAA 24.0 1000
Jim Creek, WA NLK 24.8 250
Lualualei, HI NPM 21.4 566
LaMoure, ND NML 25.2 500