Propagation

Useful information about Propagation:

DXing.info - conditions having influence on reception of MW stations.

Wikipedia - how radiowaves are propagated.

ARRL Amateur Radio - Solar Update.

NOAA - Space Weather, weekly

10/07-2010

Erupting sunspot will soon face Earth
NASA's Solar Dynamics Observatory recorded a flare during the early hours of 8 July. It heralds the approach of a sunspot - possibly a big one - that has been erupting on the far side of the sun for days.
Read more at
http://www.spaceweather.com/archive.php?view=1&day=08&month=07&year=2010
SpaceWeather.com (8/7-2010) via Mike Terry via dxld yg (10/7-2010)

26/06-2010

The K7RA Solar Update
May 21st, 2010 http://www.arrl.org/news/the-k7ra-solar-update-118
Steve Lare via dxld yg (26/6-2010)

06/05-2010

Space Weather News
A high-speed solar wind stream hit Earth's magnetic field last night (May 2-3), sparking a geomagnetic storm that lasted more than 15 hours. In Scandinavia, the Northern Lights were so bright they could be seen through the glow of the midnight sun. Red auroras spilled across the Canadian border and were spotted in several US states.
Details and images are features in today's edition of http://spaceweather.com.
(Not known if any unusual propagation effects reported).
Mike Terry via dxld yg (3/5-2010)

24/04-2010

12/04-2010

Geomagnetic storm
A strong geomagnetic storm on Monday and Tuesday, April 5-6, was the biggest since 2006, at least in terms of high planetary A index.
Details here http://www.arrl.org/
Mike Terry via dxld yg (10/4-2010)

30/03-2010

Radio-active sunspot
Over the weekend, big sunspot 1057 emitted a series of radio bursts that caused roaring sounds to issue from the loudspeakers of shortwave receivers.
Visit today's edition of http://spaceweather.com to hear a sample "roar" and to find out how you can build your own solar radio burst monitor.
Space Weather News for March 29, 2010 http://spaceweather.com
Mike Terry via dxld yg (30/3-2010)

18/03-2010

Geomagnetic storm alert as solar wind and coronal mass ejection head for Earth.
A solar wind stream is heading for Earth, and so is a coronal mass ejection. Together, they add up to a geomagnetic storm alert for March 17th and 18th.
More at http://www.spaceweather.com/
http://www.rsgb.org/news/articlelinks.php?id=0054
There is more information about solar activity and radio propagation at
http://hamwaves.com/propagation/solar/radionetherlands/explanation2.html
Mike Terry via dxld yg (17/3-2010)

16/03-2010

Sun begins new solar cycle, flinging radiation at the Earth.
As a new solar cycle of activity begins this year, the Earth will once again be bombarded with increased radiation from the sun. This effect may damage satellites and interfere with GPS, television and communications...
Full story at http://www.dw-world.de/dw/article/0,,5323618,00.html
Mike Terry via dxld yg (15/3-2010)

We experienced a bit of a scare this week when four days went by with no sunspots. That's right -- for the first time in three months we saw more than a single day with a sunspot number of zero, and that last period was back during November 23 through December 8...
Full story at http://www.southgatearc.org/propagation/2010/k7ra/march_13.htm
Mike Terry via dxld yg (15/3-2010)

08/02-2010

Big sunspot sparks solar activity
Spaceweather reports that the sudden emergence of big sunspot 1045 over the weekend has caused a sharp uptick in solar activity.
The active region has produced three M-class and almost a dozen C-class solar flares since it appeared on Saturday.
The strongest blast, an M6-class eruption on February 7th, may have hurled a coronal mass ejection toward Earth.
High-latitude sky watchers should be alert for auroras in the nights ahead as a result of this activity. Also, ham radio operators are picking up strong solar radio bursts using shortwave receivers.
Sample sounds and images may be found at http://spaceweather.com
http://www.southgatearc.org/news/february2010/big_sunspot_sparks_solar_activity.htm
Mike Terry, dxld yg (8/2-2010)