news
Submitted on 2004-06-14
Every first day of the month, the Monthly Sunspot bulletin is broadcast. Data of many worldwide distributed stations is used to calculate "The International Sunspot Number".
Submitted on 2004-06-01
In the morning of June 8, 2004 - visible in the whole of Europe - we can witness a rare astronomical event: the passage of Venus in front of the Sun. This is indeed rare: the last passage took place in 1882 and was only seen partially in Europe.
Submitted on 2004-05-17
Since May 12, the Pleiades are visible in images taken by LASCO/C3, a coronograph onboard of SOHO. As this cluster of stars 'travels' from left to right in a series of LASCO images, they will disappear end May. View in the image underneath the Pleiades in the field of view of LASCO/C3.
Submitted on 2004-05-11
CACTus is not a plant, it's a software tool "Computer Aided CME Tracking" developed by the SIDC to autonomously detect coronal mass ejections (CMEs) in a series of pictures taken by LASCO, the coronograph onboard of SOHO. On May 10, CACTus detected a partial halo CME. There is only a small chance that the glancing blow in two of three days affects the earth magnetic field.
Submitted on 2004-05-06
Late April 29, we could witness the birth of a sunspot which made already some fuzz before it even got a name. With an amazing speed the baby became an adult with a complex magnetic configuration. May 1 and May 2 turned out to be its glory days.
Fragment of the weekly bulletin from April 26 until May 2:
Submitted on 2004-04-29
The SOHO team announced on April 27, 2004 at 21:00 UT that SOHO is back in normal mode. The satellite can continue its scientific mission. This is indeed a great relief for us, forecasters. Underneath the first EIT-movies made since the satellite is again in normal mode.
EIT 171
Submitted on 2004-04-23
The EIT-telescope as well as LASCO have become temporarily blind. An onboard computer remarked a virtual malfunction and ordered the satellite to go into the 'safe' mode in which only vital functions are kept alive.
Newsflash broadcast on the SOHO-webpage on April 21, 2004
"... SOHO entered ESR (safe) mode at 05:37 UT. The ESR was triggered by the FSPAAD (Fine Sun Pointing Attitude Anomaly Detector)."
Submitted on 2004-04-02
On March 24 and 25, two M-flares were registered from an active region still behind the east limb. First visible in SOHO/MDI on March 25, 16:06 the group seemed to have a promising flaring future. It fell short of our expectations. But, on March 31, the giant woke up and produced a long duration event continuing for more than 24 hours!
Submitted on 2004-03-18
Last week, a large coronal hole played the leading part in the space weather news, just as it also did 27 days ago.
Submitted on 2004-03-08
Since 1998, shutterless EIT campaigns led by the SIDC, were run to spot particular solar events. "Small scale" - "short time variations" are two of the key words of these campaigns. The last shutterless campaign was held on February 18 and 25, 2004.
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