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-- Video Live Stream by USTREAM ---- LIVE FROM THE HUNTER VALLEY, NSW, AUSTRALIA, 43SE144 11m VIDEO FEED

MRC 2009 in less than 5 months

Received this email off Tony, the director of The Mountain Radio Challenge. I'll be activating 'The Log Dump' up in the Barrington Tops National Park. Updates will be posted on this forum & on the SEDX home site.

Hello All,

Its now less than 5 months until MRC2009 (Nov 28th), and I have been chatting to a few of you about it, including some new people. I've made a few updates to the website at www.mrc.cat.net.au

MRC 2010 will be our 20th year Anniversary, and as such Im keen to make it the biggest MRC ever. MRC 2009 will be a good opportunity to try something new, in preparation for next year. It may also be a time to try something low key, saving your efforts for 2010.

Id like to get things moving, so can you please let me know if you'd like to participate this year, and your preferred location. We can start to create the chain for the message, or consider opportunities that new locations & people, may present.

It has been suggested we could benefit from a regular (ie monthly / fortnightly / weekly) online discussion. Can you let me know you preference in applications such as; Skype, PalTalk, eQso which all have multi user chat capabilities.

Please reply so we can get started on MRC2009.

Thanks

Tony vft355

Hi all, I'd like to welcome our 2 newest members to the Sierra Echo 11m DX Group, Mr Robert, 2SE50, from Sth Carolina USA & Mr Dustin, 2SE787, from Colorado USA.

http://www.sierraecho11mdx.com/
http://www.sierraecho11mdx.com/43se144
The Sierra Echo 11m DX Group has it's own domain name. The 43 Sierra Echo 144 home page is now in the SEDX domain, the NEW URL is above. Updates will be posted on this forum.
There will be times when the site is not available, due to work in progress, so I'm sorry for any inconvenience.
SEDX Admin
Pete

June 17, 2009: The sun is in the pits of a century-class solar minimum, and sunspots have been puzzlingly scarce for more than two years. Now, for the first time, solar physicists might understand why.

At an American Astronomical Society press conference today in Boulder, Colorado, researchers announced that a jet stream deep inside the sun is migrating slower than usual through the star's interior, giving rise to the current lack of sunspots.

Rachel Howe and Frank Hill of the National Solar Observatory (NSO) in Tucson, Arizona, used a technique called helioseismology to detect and track the jet stream down to depths of 7,000 km below the surface of the sun. The sun generates new jet streams near its poles every 11 years, they explained to a room full of reporters and fellow scientists. The streams migrate slowly from the poles to the equator and when a jet stream reaches the critical latitude of 22 degrees, new-cycle sunspots begin to appear.

Howe and Hill found that the stream associated with the next solar cycle has moved sluggishly, taking three years to cover a 10 degree range in latitude compared to only two years for the previous solar cycle.

The jet stream is now, finally, reaching the critical latitude, heralding a return of solar activity in the months and years ahead.

"It is exciting to see", says Hill, "that just as this sluggish stream reaches the usual active latitude of 22 degrees, a year late, we finally begin to see new groups of sunspots emerging."

The current solar minimum has been so long and deep, it prompted some scientists to speculate that the sun might enter a long period with no sunspot activity at all, akin to the Maunder Minimum of the 17th century. This new result dispells those concerns. The sun's internal magnetic dynamo is still operating, and the sunspot cycle is not "broken."

Because it flows beneath the surface of the sun, the jet stream is not directly visible. Hill and Howe tracked its hidden motions via helioseismology. Shifting masses inside the sun send pressure waves rippling through the stellar interior. So-called "p modes" (p for pressure) bounce around the interior and cause the sun to ring like an enormous bell. By studying the vibrations of the sun's surface, it is possible to figure out what is happening inside. Similar techniques are used by geologists to map the interior of our planet.

In this case, researchers combined data from GONG and SOHO. GONG, short for "Global Oscillation Network Group," is an NSO-led network of telescopes that measures solar vibrations from various locations around Earth. SOHO, the Solar and Heliospheric Observatory, makes similar measurements from space.

"This is an important discovery," says Dean Pesnell of NASA's Goddard Space Flight Center. "It shows how flows inside the sun are tied to the creation of sunspots and how jet streams can affect the timing of the solar cycle."

"We still don't understand exactly how jet streams trigger sunspot production," says Pesnell. "Nor do we fully understand how the jet streams themselves are generated."

To solve these mysteries, and others, NASA plans to launch the Solar Dynamics Observatory (SDO) later this year. SDO is equipped with sophisticated helioseismology sensors that will allow it to probe the solar interior better than ever before.

"The Helioseismic and Magnetic Imager (HMI) on SDO will improve our understanding of these jet streams and other internal flows by providing full disk images at ever-increasing depths in the sun," says Pesnell.

Continued tracking and study of solar jet streams could help researchers do something unprecedented--accurately predict the unfolding of future solar cycles. Stay tuned for that!