Space Weather Update ~ Quiet Sun

QUIET SUN: With the departure of sunspot AR1654, a new spell of low solar activity is underway. NOAA forecasters put the odds of a strong solar flare today at less than 5%. Solar flare alerts: text, voice.

LUNAR ECLIPSE OF JUPITER: Last night, the Moon passed by Jupiter only a fraction of a degree away. In parts of South America, the close encounter was so close, it became an eclipse. Luis Argerich sends this photo from Buenos Aires, Argentina:

"I captured half a Jupiter floating next to the Moon with my telescope as the occultation was in progress," says Argerich. "It was incredible to see Jupiter disappear behind the Moon's dark limb."

Another occultation of Jupiter is less than a month away. The people of southern Australia will see it on Feb. 18th. Meanwhile, browse the photo gallery for more shots of last night's display.

Realtime Moon-Jupiter Photo Gallery

AWASH IN JUPITER RADIO BURSTS: The planet Jupiter is a powerful source of shortwave radio bursts. They come from natural radio lasers in the giant planet's polar magnetosphere that sometimes sweep past Earth as Jupiter rotates. On Jan. 21st, as Jupiter and the Moon were converging for their Monday conjunction, a series of Jupiter's radio laser beams hit Earth. Amateur astronomer Thomas Ashcraft recorded the static-y sounds coming from the loudspeaker of his shortwave radio telescope in New Mexico:

Dynamic spectrum courtesy of Wes Greenman, Radio Alachua Observatory

"Sometimes when people are outside Jupiter-gazing they might also be awash in Jovian radio beam sweeps and not know it," says Ashcraft. "On Sunday, a Jovian radio storm produced a few minutes of strong radio waves. As I was outside my observatory looking up at Jupiter I was also hearing the waves on my radio telescope speakers and realized that my own body was, in that moment, being bathed in electromagnetic beams from Jupiter. What a nice feeling!"

Realtime Space Weather Photo Gallery

NORTHERN LIGHTS: A CME hit Earth's magnetic field during the late hours of Jan. 19th, producing Northern Lights so bright, they woke up the Arctic fox:

Vladimir Scheglov sends the picture from the Kupol mine in the Chukotka region of Russia. "The Kupol mine has banned hunting, so wild animals are not afraid of people," he explains.

More lights are possible on Jan. 23th when a negative-polarity solar wind stream is expected to hit Earth's magnetic field. NOAA forecasters estimate a 20% chance of polar geomagnetic storms. Aurora alerts: text, voice.

Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/POES

Planetary K-index
Now: Kp= 0 quiet
24-hr max: Kp= 0 quiet
explanation | more data

Interplanetary Mag. Field
B_total: 3.6 nT
B_z: 1.2 nT south
explanation | more data
Updated: Today at 0037 UT

Coronal Holes: 21 Jan 13

Solar wind flowing from this southern coronal hole should read Earth approximately five days from now. Credit: SDO/AIA.