news
Submitted on 2013-05-21
Early last week, the Sun produced 4 X-class solar flares in rapid succession. They all originated from NOAA 1748, a magnetically complex region located near the east solar limb. In summary, there was an X1.7 flare on 13 May peaking at 02:17UT, an X2.8 the same day at 16:05UT, an X3.2 early on 14 May at 01:11UT, and the final X1.2 on 15 May at 01:48UT. The SDO images underneath show for each flare the outlook of the region 1.5 hours before the maximum, the maximum itself, and 1.5 hours after the x-ray peak (resp. left, middle and right frame).
Submitted on 2013-05-17
This news item was written by Frederic Clette, WDC - Sunspot Index.
Many solar cycle predictions are based on mathematical or physical models. Current models are only able to produce a smooth global envelope to describe the variation of solar activity during one 11-year cycle, as illustrated in figure below. So, we are used to consider a solar cycle as a rather smooth bell-shaped curve with some asymmetry. This is definitely affecting the current interpretations of the rise of cycle 24.
Submitted on 2013-05-16
Solar observers were enchanted by a beautiful prominence appearance last week. The picture underneath was taken through a small 4cm H-alpha telescope on 9 May at 8:24UT, just hours before the prominence spectacularly erupted (movie).
Submitted on 2013-05-13
SWAP, an EUV images onboard of PROBA2 captured 3 moon walks on May 9 and 10: 2 lunar passages in front of the solar disk and 1 'rolling coin' passage.
The simulation shows 2 extra, however less spectacular lunar passages: the moon passes the Sun from 'far'. These data were not sent to the ground station. Solar eclipses are used to calibrate SWAP and analyse the effect of instrumental stray light.
Submitted on 2013-05-07
On 29 April, members of the BRAMS network observed radio disturbances at 49.97 MHz. BRAMS is short for Belgian RAdio Meteor Stations, and consists mostly of Belgian radio amateurs listening for meteor reflections from a beacon signal sent out by the Geophysical Centre of Dourbes. The main purpose is to study features of the meteors and their source-particles.
Submitted on 2013-05-06
On April 25, the Space Pole was flooded with kids and teenagers. That day, their self-made experiment was hooked on a weather balloon and took off to the border of space.
All-round and Hands-on
|
Submitted on 2013-05-02
During the last fortnight, two coronal holes (one on each solar hemisphere) transited the solar disk, as shown in this clip from GOES15/SXI imagery. Passing the disk's centre around 22-23 April, the high speed gusts of energetic particles created active geomagnetic conditions on 25 April and even a brief minor storm period on 26 April.
Submitted on 2013-04-26
It's always impressive to see sunspots develop from scratch, and cluster into an ominously looking sunspot group. Early on Friday 19 April, magnetic fields pushed through the solar surface and did just that in less than 24 hours. NOAA 1726 was born, and it was a quite large group: In the image underneath, there is room to easily fit 10 Earths between the outer edges of the two main spots!
Submitted on 2013-04-18
No doubt about it: The M6 flare in sunspot group NOAA 1719 was the highlight of last week's space weather activity.
A movie was created showing the various aspects of this flare and its impact on Earth. Some additional details can be found underneath.
Submitted on 2013-04-11
Sunspots are magnetic disturbances on the surface of the Sun. This was discovered back in 1908 by George Ellery Hale. In the next few decades, technology improved and during the 1950's and 60's, Horace Welcome Babcock and Robert Benjamin Leighton developed the magnetograph (see note 1) to display the magnetic field of the entire Sun. These maps are known as magnetograms. They show essentially white and black patches, mostly corresponding to active regions and sunspot groups (See 4 April 2013 SDO image underneath).
Pages
Zircon - This is a contributing Drupal Theme
Design by
WeebPal.
