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Fraser
2005-Nov-28, 07:44 PM
SUMMARY: The Solar and Heliospheric Observatory (SOHO) is celebrating its 10th anniversary of operations on December 2nd, 2005. Over the course of these 10 years, SOHO has revealed the nature of the Sun's atmosphere, the links between its magnetic fields and coronal mass ejections, and even discovered more than 1,000 comets. Scientists even figured out how to use SOHO to probe the far side of the Sun.

View full article (http://www.universetoday.com/am/publish/soho_ten_year_anniversary.html)
What do you think about this story? post your comments below.

galacsi
2005-Nov-30, 07:58 PM
I am asking myself why SOHO is finding so much comets ?
Is it because sungrazing comets are the more common comets ? Or SOHO has the best equipment or a better position to observe ?

If the first case is true , how one can explain it ?

ToSeek
2005-Nov-30, 08:12 PM
SOHO is the only spacecraft I can think of that has gone from being a scientific research satellite to an operational one during its lifetime.

galacsi
2005-Nov-30, 09:59 PM
SOHO is the only spacecraft I can think of that has gone from being a scientific research satellite to an operational one during its lifetime.

Er , what do you mean ? Searching being done from the internet ?

Sorry but you loose me.

Wolverine
2005-Nov-30, 10:22 PM
Any idea how long the spacecraft can continue operations? I'd imagine all that bombardment would take its toll after a decade. Quite a milestone, regardless.

George
2005-Dec-01, 12:12 AM
It sure would be nice to send these folks something to show our admiration. You know, let's add a little sunshine to their life. [ok, maybe they are exempt from that metaphor. ;)]

Here are other accomplishments to date....
[

140 Ph.D. theses have been written on or about SOHO data.
289 scientific meetings on subjects related to SOHO appear on our meetings pages.
944 news stories appear on our newsroom pages (only recorded between 1997 and 2005!).
1000 comets have been found. SOHO is the most prolific comet-finder observatory of all times, and has identified almost half of all comets for which an orbit determination has been made.
2300 reviewed papers using SOHO data have been published.
2300 scientists (approximately) appear in the author lists of those papers (we like to say that every current solar scientist has had the chance to work with SOHO data).
3230 science planning meetings have been held.
2 000 000 command blocks have been sent to the spacecraft by the ground system.
5 000 000 distinct files have been served by the web server.
10 000 000 exposures (almost!) have been made by the CDS instrument.
16 000 000 distinct hosts have been served by the web server.
50 000 000 exposures have been taken by MDI. They're probably quite high on the list of "the world's most durable camera shutters". Don't try to beat it with your favourite SLR camera!
266 000 000 web page requests have been served.
16 000 000 000 000 bytes (16 Terabytes) of data are contained in the SOHO archive.
85 000 000 000 000 bytes (85 Terabytes) of web pages/data have been served.

From SOHO (http://sohowww.nascom.nasa.gov/)

zephyr46
2005-Dec-01, 01:39 AM
Ulysses (http://helio.estec.esa.nl/Ulysses/) 6 10 1990 celebrated 15 years.

Steve_Farmer_Jr
2005-Dec-02, 06:57 PM
SOHO finds so many comets because it has an occulting disk in front of the CCD imager that causes an "artificial eclipse" of the sun and blocks the extreme light. By doing this, it allows comets to become visible that would normally be missed by earthbound telescopes. Most SOHO comets that are discovered belong to a group of comets known as the Kreutz Group.

A complete list of SOHO comet discoverers is at this link.

http://home.earthlink.net/~tonyhoffman/SOHOleaderboard.htm

Steve Farmer Jr.
SOHO Comet Discoverer

Wolverine
2006-Jan-02, 01:18 PM
Earlier I'd asked:


Any idea how long the spacecraft can continue operations? I'd imagine all that bombardment would take its toll after a decade. Quite a milestone, regardless.

In case anyone else was curious, I found a partial answer (http://skyandtelescope.com/news/article_1640_1.asp):


In fact, SOHO's service is now being extended at least until 2007, a decade longer than originally planned, so it can cover a complete 11-year solar cycle.

Sweet! Talk about gravy.