För er som prenumerar på mitt twitterflöde så kanske ni fångade upp följande meddelande från NOAA (National Oceanic & Atmospheric Administration):
Space Weather Message Code: WARK07 WARNING: Geomagnetic K-index of 7 or greater (G3 or greater)
Vid närmare titt så ser hela meddelandet ut så här:
Serial Number: 32
Issue Time: 2011 Aug 05 2146 UTCWARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2011 Aug 05 2200 UTC
Valid To: 2011 Aug 06 0300 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater – Strong to Extreme
”G3″ hänvisar till en skala som används för att beskriva styrkorna i dessa utbrott och vilken påverkan de kan tänkas ha. Skalan återfinns på Space Weather Prediction Centers hemsida
Till skillnad från Aftonbladet som valt att ta betalt för att låta er läsa om det vill jag tillhandahålla ovanstående information så ni kan bilda er egen uppfattning av vad detta innebär för er. En ”G3″ eller starkare innebär följande:
G3:
Power systems: voltage corrections may be required, false alarms triggered on some protection devices.Spacecraft operations: surface charging may occur on satellite components, drag may increase on low-Earth-orbit satellites, and corrections may be needed for orientation problems.
Other systems: intermittent satellite navigation and low-frequency radio navigation problems may occur, HF radio may be intermittent, and aurora has been seen as low as Illinois and Oregon
G4:
Power systems: possible widespread voltage control problems and some protective systems will mistakenly trip out key assets from the grid.Spacecraft operations: may experience surface charging and tracking problems, corrections may be needed for orientation problems.
Other systems: induced pipeline currents affect preventive measures, HF radio propagation sporadic, satellite navigation degraded for hours, low-frequency radio navigation disrupted, and aurora has been seen as low as Alabama and northern California
G5:
Power systems: : widespread voltage control problems and protective system problems can occur, some grid systems may experience complete collapse or blackouts. Transformers may experience damage.Spacecraft operations: may experience extensive surface charging, problems with orientation, uplink/downlink and tracking satellites.
Other systems: pipeline currents can reach hundreds of amps, HF (high frequency) radio propagation may be impossible in many areas for one to two days, satellite navigation may be degraded for days, low-frequency radio navigation can be out for hours, and aurora has been seen as low as Florida and southern Texas
Så här skriver Reuters om det hela:
Three large explosions from the Sun over the past few days have prompted U.S. government scientists to caution users of satellite, telecommunications and electric equipment to prepare for possible disruptions over the next few days.
”The magnetic storm that is soon to develop probably will be in the moderate to strong level,” said Joseph Kunches, a space weather scientist at the Space Weather Prediction Center, a division of the U.S. National Oceanic and Atmospheric Administration (NOAA).
He said solar storms this week could affect communications and global positioning system (GPS) satellites and might even produce an aurora visible as far south as Minnesota and Wisconsin.
Oklart om SJ-resenärer kommer bli drabbade… men det krävs ju numera inga solstormar för sånt.
Källor:
http://www.spaceref.com/news/viewsr.html?pid=37912
http://twitter.com/#!/spaceweather/status/99606818225000448
http://www.reuters.com/article/2011/08/05/us-utilities-noaa-solarstorms-idUSTRE7746UA20110805
http://twitter.com/centrifugen
Den 8:e november passerar en rymdbumling innanför månbanan. Närmare bestämt 0,85 månavstånd från jorden. Den är 400 meter i diameter och ”enkelt synlig” för oss på norra jordklotet. Vi kan känna oss lyckligt lottade att den inte väljer att komma närmare, fast å andra sidan så är medvetna val begränsat till oss själva och möjligen andra civilisationer i en galax långt långt borta…
Här är mer information från Near Earth Object Programs hemsida:
Near-Earth asteroid 2005 YU55 will pass within 0.85 lunar distances from the Earth on November 8, 2011. The upcoming close approach by this relatively large 400 meter-sized, C-type asteroid presents an excellent opportunity for synergistic ground-based observations including optical, near infrared and radar data. The attached animated illustration shows the Earth and moon flyby geometry for November 8th and 9th when the object will reach a visual brightness of 11th magnitude and should be easily visible to observers in the northern and southern hemispheres. The closest approach to Earth and the Moon will be respectively 0.00217 AU and 0.00160 AU on 2011 November 8 at 23:28 and November 9 at 07:13 UT.
Givetvis kommer denna information också med lite reserverationer från NASA:
Although classified as a potentially hazardous object, 2005 YU55 poses no threat of an Earth collision over at least the next 100 years. However, this will be the closest approach to date by an object this large that we know about in advance and an event of this type will not happen again until 2028 when asteroid (153814) 2001 WN5 will pass to within 0.6 lunar distances.
De må vara små bumlingar (några tiotals meter i diameter) men de kommer riktigt nära denna gången. Imorgon (8:e september) susar två bumlingar (asteroider) förbi jorden på avståndet 0.2 resp. 0.6 LD (månavstånd). Som jämförelse var nedfallet i Ryska Tunguska orsakat av en meteorid på dryga 60 meter i diameter.
0.2 LD är bara dryga 7688 mil från jorden.
Källa:
http://neo.jpl.nasa.gov/ca
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