You are viewing the page for Apr. 1, 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: 586.0 km/s
3.0 protons/cm3
explanation | more data
Updated: Today at 2246 UT

X-ray Solar Flares
6-hr max:
A0 2235 UT Apr01
24-hr: A1 1325 UT Apr01
explanation | more data
Updated: Today at 2245 UT

Daily Sun: 01 Apr '07

Tiny, disintegrating sunspot 949 poses no threat for solar flares. Credit: SOHO/MDI

Sunspot Number: 15
What is the sunspot number?
Updated: 31 Apr 2007

Far Side of the Sun

This holographic image reveals no large sunspots on the far side of the sun. Image credit: SOHO/MDI

Interplanetary Mag. Field
Btotal: 8.2 nT
7.3 nT south
explanation | more data
Updated: Today at 2246 UT

Coronal Holes:

Earth is entering a solar wind stream flowing from the indicated coronal hole. 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 Apr 01 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 Apr 01 2203 UTC
0-24 hr 24-48 hr
ACTIVE 35 % 35 %
MINOR 20 % 20 %
SEVERE 05 % 05 %

High latitudes
0-24 hr 24-48 hr
ACTIVE 40 % 40 %
MINOR 25 % 25 %
SEVERE 10 % 10 %

What's Up in Space -- 1 Apr 2007
Subscribe to Space Weather News

Did you miss last night's auroras? Next time get a wake-up call from Spaceweather PHONE.

AURORA WATCH: Sky watchers from Scandinavia to Alaska should be alert for auroras tonight. A solar wind stream is buffeting Earth's magnetic field, causing mild but pretty geomagnetic storms.

3D FLYBY: Get ready to cross your eyes. On March 28th, when asteroid 2006 VV2 flew past spiral galaxy M81, two photographers on opposite sides of the USA photographed the encounter. A cross-eyed view of their photos makes the asteroid pop out in startling 3D:

(Hint: Stare at the middle of this image and cross your eyes until the two galaxies overlap. Focus on the asteroid. The longer you stare, the more pronounced the 3D sensation becomes.)

"I produced this stereogram by combining the images of William Keel in Tuscaloosa, AL, and Robert Long in Vado, NM," explains Colorado astronomer Chris Peterson. "Because the asteroid was so close (4.6 million km), and the baseline between the images so long (1780 km), the parallax between the asteroid and the background stars is significant, and the stereo effect is quite real." [more]

MOONS OF JUPITER: Friday morning, March 23rd, was "amazing," says astrophotographer Mike Salway of Australia. "The sky was clear, seeing was superb," and this is what he saw when he pointed his 12-inch telescope at Jupiter:

The orb at lower right is Jupiter's giant moon Ganymede, almost as large as Mars. Just above it hovers Europa, home to the solar system's largest underground oceans.

Now click on the image to set the scene in motion!

"I love watching Ganymede and Europa move across Jupiter -- they give a 3D perspective and really do appear to float above the planet," says Salway. "There's detail on Ganymede in practically every frame as well, even when it is in front of Jupiter."

Ready to see for yourself? Wake up at dawn and point your telescope south. Jupiter is the brightest "star" in the morning sky--you can't miss it.

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 1 Apr 2007 there were 855 known Potentially
Hazardous Asteroids

March 2007 Earth-asteroid encounters




2007 EH

Mar. 11

0.5 LD


10 m
2007 EK

Mar. 13

0.7 LD


5 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

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

©2019 All rights reserved.