SOLAR SECTOR BOUNDARY CROSSING: High-latitude auroras are possible on Jan. 21st when Earth crosses through a fold in the heliospheric current sheet. This is called a "solar sector boundary crossing," and NOAA forecasters estimate a 25% chance of polar geomagnetic storms when it occurs. Aurora alerts: text, voice.
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Solar wind
speed: 301.4 km/sec
density: 3.3 protons/cm3
explanation | more data
Updated: Today at 1727 UT
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X-ray Solar Flares
6-hr max: C1 1459 UT Jan20
24-hr: C3 0220 UT Jan20
explanation | more data
Updated: Today at: 1700 UT
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Daily Sun: 20 Jan 14
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A phalanx of new sunspots on the sun's southeastern limb poses a threat for M-class solar flares, not Earth-directed. Credit: SDO/HMI
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Sunspot number: 91
What is the sunspot number?
Updated 19 Jan 2014
Spotless Days
Current Stretch: 0 days
2014 total: 0 days (0%)
2013 total: 0 days (0%)
2012 total: 0 days (0%)
2011 total: 2 days (<1%)
2010 total: 51 days (14%)
2009 total: 260 days (71%)
Update 19 Jan 2014
The Radio Sun
10.7 cm flux: 130 sfu
explanation | more data
Updated 19 Jan 2014
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Current Auroral Oval:
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Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/POES
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Planetary K-index
Now: Kp= 1 quiet
24-hr max: Kp= 1 quiet
explanation | more data
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Interplanetary Mag. Field
Btotal: 5.1 nT
Bz: 2.4 nT south
explanation | more data
Updated: Today at 1727 UT
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Coronal Holes: 18 Jan 14
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Solar wind flowing from the indicated coronal hole could reach Earth on Jan. 22-23.. Credit: SDO/AIA.
