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SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids

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Science news and information about the Sun-Earth environment.

SPACE WEATHER
Current
Conditions

Solar Wind
speed: 530.3 km/s
density:
7.8 protons/cm3
explanation | more data
Updated: Today at 2245 UT


X-ray Solar Flares

6-hr max:
A5 1940 UT Apr13
24-hr: B1 0205 UT Apr13
explanation | more data
Updated: Today at 2240 UT

Daily Sun: 13 Apr '06

None of these sunspots pose a threat for strong solar flares. Credit: SOHO/MDI.


Sunspot Number: 79
What is the sunspot number?
Updated: 12 Apr 2006

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: 18.4 nT
Bz:
0.5 nT north
explanation | more data
Updated: Today at 2246 UT

Coronal Holes:

A solar wind stream flowing from the indicated coronal hole could hit Earth's magnetic field on April 14th or 15th. Credit: SOHO Extreme UV Telescope


SPACE WEATHER
NOAA
Forecasts

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 2006 Apr 13 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 2006 Apr 13 2203 UTC
Mid-latitudes
0-24 hr 24-48 hr
ACTIVE 30 % 30 %
MINOR 10 % 10 %
SEVERE 05 % 05 %

High latitudes
0-24 hr 24-48 hr
ACTIVE 40 % 40 %
MINOR 15 % 15 %
SEVERE 10 % 10 %

What's Up in Space -- 13 Apr 2006
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Did you sleep through the auroras? Next time get a wake-up call. Sign up for Spaceweather PHONE.

A PLANET NAMED GEORGE: This month Venus can lead you to a naked-eye planet that ancient astronomers inexplicably failed to notice. Get the full story from Science@NASA.

EGG MOON: According to folklore, tonight's full moon is the Egg Moon. Go outside and take a look; what you see may give you some good ideas for coloring Easter eggs. Craters. Rays. Mountain ranges. Finally, you can put all those cracked shells to good use!

Above: The Egg Moon photographed by Darrell Spangler of Drake, Colorado.

Other names for April's full moon are the Pink Moon, the Fish Moon, the Sprouting Grass Moon and even the Tax Moon. So close to Easter, however, Egg Moon seems best.

COMET NEWS: Astronomers are monitoring the many fragments of dying comet 73P/Schwassmann-Wachmann as it approaches Earth for a close encounter in May 2006. Two new developments: Fragment B is in an accelerated state of decay. The mini-comet has become elongated and no longer displays a central condensation, according to IAU Electronic Telegram No. 473. (continued below)

Above: High-resolution images of Fragment B on April 12th. Photo credit: Aletti Andrea and Buzzi Luca of the Schiaparelli Observatory in Varese, Italy.

Pictured above, fragment B is glowing like a 9th magnitude star, making it an easy target for backyard telescopes and CCD cameras. Amateur astronomers can actually watch this comet fall apart: sky map, ephemeris.

Meanwhile, further along the "string of pearls," fragment G has also split. Fresh ice exposed by the disruption is vaporizing, causing the comet to brighten nearly 15-fold since April 2nd. With a visual magnitude of 12 (IAU Circular No. 8701), fragment G is more challenging for amateurs, but no less tempting: sky map, ephemeris.



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 13 Apr 2006 there were 777 known Potentially
Hazardous Asteroids

April-May 2006 Earth-asteroid encounters
ASTEROID

 DATE
(UT)

MISS DISTANCE

MAG.

 SIZE
(meters)
2000 PN9

March 6

7.9 LD

12

~2 km
2006 EH1

March 7

2.0 LD

18

~20 m
2006 EC

March 8

0.7 LD

16

~19 m
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. See also Snow Crystals.

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 --a gallery of up-to-date solar pictures from the National Solar Data Analysis Center at the Goddard Space Flight Center. See also the GOES-12 Solar X-ray Imager.

Recent Solar Events -- a nice summary of current solar conditions from lmsal.com.

SOHO Farside Images of the Sun from SWAN and MDI.

The Latest SOHO Coronagraph Images -- from the Naval Research Lab

Daily images from the sun -- from the Big Bear Solar Observatory

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

Observable Comets -- from the Harvard Minor Planet Center.

What is the Interplanetary Magnetic Field? -- A lucid answer from the University of Michigan. See also the Anatomy of Earth's Magnetosphere.

Real-time Solar Wind Data -- from NASA's ACE spacecraft. How powerful are solar wind gusts? 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 1998 to 2001

Mirages: Mirages in Finland; An Introduction to Mirages;

NOAA Solar Flare and Sunspot Data: 1996, 1997, 1998, 1999; 2000; 2001; 2002; 2003; 2004; 2005; Jan-Mar 2006;

Space Audio Streams: (University of Florida) 20 MHz radio emissions from Jupiter: #1, #2, #3, #4; (NASA/Marshall) INSPIRE: #1; (Stan Nelson of Roswell, New Mexico) meteor radar: #1, #2;

Recent International Astronomical Union Circulars

GLOSSARY | SPACE WEATHER TUTORIAL

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

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