You are viewing the page for Feb. 10, 2007
  Select another date:
<<back forward>> -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids
Science news and information about the Sun-Earth environment.


Solar Wind
speed: 373.4 km/s
0.4 protons/cm3
explanation | more data
Updated: Today at 2246 UT

X-ray Solar Flares
6-hr max:
A0 1940 UT Feb10
24-hr: A2 0145 UT Feb10
explanation | more data
Updated: Today at 2245 UT

Daily Sun: 10 Feb '07

Departing sunspot 941 poses no threat for strong solar flares. Credit: SOHO/MDI!

Sunspot Number: 11
What is the sunspot number?
Updated: 09 Feb 2007

Far Side of the Sun

This holographic image confrms the presence of a moderately large spot on the far side of the sun. Image credit: SOHO/MDI

Interplanetary Mag. Field
Btotal: 5.5 nT
2 nT south
explanation | more data
Updated: Today at 2247 UT

Coronal Holes:

A solar wind stream flowing from the indicated coronal hole could reach Earth as early as Feb 13th. Credit: SOHO Extreme UV Telescope


Solar Flares: Probabilities for a medium-sized (M-class) or a major (X-class) solar flare during the next 24/48 hours are tabulated below.
Updated at 2007 Feb 10 2203 UTC
FLARE 0-24 hr 24-48 hr
CLASS M 01 % 01 %
CLASS X 01 % 01 %

Geomagnetic Storms: Probabilities for significant disturbances in Earth's magnetic field are given for three activity levels: active, minor storm, severe storm
Updated at 2007 Feb 10 2203 UTC
0-24 hr 24-48 hr
ACTIVE 20 % 25 %
MINOR 15 % 20 %
SEVERE 05 % 10 %

High latitudes
0-24 hr 24-48 hr
ACTIVE 25 % 30 %
MINOR 20 % 25 %
SEVERE 10 % 15 %

What's Up in Space -- 10 Feb 2007
Subscribe to Space Weather News

Cards, flowers, chocolate... what's missing? The heavens. Spaceweather PHONE for Valentine's Day.

WEEKEND RINGS: This weekend Saturn is at its closest to Earth: 762 million miles. It thus looks bigger and brighter both to the naked eye and through a telescope than it will at any other time in 2007. Look for Saturn rising in the east at sunset and soaring nearly overhead at midnight: sky map.

DOUBLE FLARE: An Iridium flare is unforgettable. Sunlight hits a flat surface on one of the Iridium satellites and--wow!--it looks like a supernova.

Make that two supernovas. Last night, Chris White witnessed a double Iridium flare over the Church of St. Peter in Mendota Heights, Minnesota:

Photo details: Canon 350D, 32mm lens, f/4, 800ASA, 14s

"The flares came from two Iridium satellites, numbers 59 and 96," explains White. "Less than 1 second elapsed between the two flashes, in fact I saw no noticeable delay at all."

There are 66 active and 13 spare Iridium satellites swarming around Earth in six different polar orbits. What are the odds of catching two bright glints from two different satellites within one second? It must not be as rare as it sounds. On the same night in Raron, Switzerland, Peter Heinzen photographed two flares one almost-on-top of the other: image. And in St. Paul, Minnesota, Tony Bombardo photographed the same pair that Chris White saw: image.

Would you like to see an Iridium flare, or two? Visit Heaven's Above for local predictions.

FARSIDE OF THE SUN: An active sunspot may be coming. On Feb. 5th, helioseismic holography revealed a seemingly-large active region on the sun's farside:

Photo details: Canon 350D, Tamron 19-35mm lens, 800 iso, 30 seconds

And today, a coronal mass ejection (CME) billowed over the sun's eastern limb: movie. Are the two observations connected? We'll know more in a few days. The sun's rotation should carry the farside spot over the eastern limb on Feb 12th or 13th, giving us a better view of its size and explosive potential. Stay tuned.

Potentially Hazardous Asteroids (PHAs) are space rocks larger than approximately 100m that can come closer to Earth than 0.05 AU. None of the known PHAs is on a collision course with our planet, although astronomers are finding new ones all the time.

On 10 Feb 2007 there were 842 known Potentially
Hazardous Asteroids

Feb-Mar 2007 Earth-asteroid encounters




2006 AM4

Feb. 1

5.2 LD


180 m
2007 BZ48

Feb. 7

4.5 LD


30 m
2006 VV2

Mar. 31

8.8 LD


2 km
Notes: LD is a "Lunar Distance." 1 LD = 384,401 km, the distance between Earth and the Moon. 1 LD also equals 0.00256 AU. MAG is the visual magnitude of the asteroid on the date of closest approach.

Essential Web Links

NOAA Space Environment Center -- The official U.S. government bureau for real-time monitoring of solar and geophysical events, research in solar-terrestrial physics, and forecasting solar and geophysical disturbances.

Atmospheric Optics -- the first place to look for information about sundogs, pillars, rainbows and related phenomena.

Solar and Heliospheric Observatory -- Realtime and archival images of the Sun from SOHO. (European Mirror Site)

Daily Sunspot Summaries -- from the NOAA Space Environment Center.

Current Solar Images -- from the National Solar Data Analysis Center

X-ray images of the Sun: GOES-12 and GOES-13

Recent Solar Events -- a summary of current solar conditions from

What is the Magnetosphere?

The Lion Roars -- visit this site to find out what the magnetosphere sounds like.

List of Potentially Hazardous Asteroids -- from the Harvard Minor Planet Center.

Observable Comets -- from the Harvard Minor Planet Center.

Real-time Solar Wind Data -- from NASA's ACE spacecraft.

How powerful are solar wind gusts? Not very! Read this story from Science@NASA.

More Real-time Solar Wind Data -- from the Solar and Heliospheric Observatory Proton Monitor.

Lists of Coronal Mass Ejections -- from 1996 to 2006

Mirages: Mirages in Finland; An Introduction to Mirages;

NOAA Solar Flare and Sunspot Data: 1994, 1995, 1996, 1997, 1998, 1999; 2000; 2001; 2002; 2003; 2004; 2005; Jan-Mar 2006; Apr-Jun 2006; Jul-Sep 2006; Oct-Dec 2006.

This site is penned daily by Dr. Tony Phillips: email

©2013 All rights reserved.