You are viewing the page for Apr. 20, 2006
  Select another date:
<<back forward>>
SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids

SpaceWeather.com
Science news and information about the Sun-Earth environment.

SPACE WEATHER
Current
Conditions

Solar Wind
speed: 401.2 km/s
density:
1.1 protons/cm3
explanation | more data
Updated: Today at 2245 UT


X-ray Solar Flares

6-hr max:
B1 1905 UT Apr20
24-hr: B1 1905 UT Apr20
explanation | more data
Updated: Today at 2245 UT

Daily Sun: 20 Apr '06

New sunspot 874 poses no threat for strong solar flares. Credit: SOHO/MDI.


Sunspot Number: 38
What is the sunspot number?
Updated: 19 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: 4.0 nT
Bz:
0.3 nT north
explanation | more data
Updated: Today at 2246 UT

Coronal Holes:

A solar wind stream flowing from this large, weakly-organized coronal hole could reach Earth on or about April 24th. 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 19 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 19 2203 UTC
Mid-latitudes
0-24 hr 24-48 hr
ACTIVE 15 % 15 %
MINOR 05 % 05 %
SEVERE 01 % 01 %

High latitudes
0-24 hr 24-48 hr
ACTIVE 20 % 20 %
MINOR 05 % 05 %
SEVERE 01 % 01 %

What's Up in Space -- 20 Apr 2006
Subscribe to Space Weather News

Did you sleep through the auroras of April? Next time get a wake-up call. Sign up for Spaceweather PHONE.

METEOR ALERT: Earth is about to skirt the dusty tail of Comet Thatcher (C/1861 G1), and this will cause the annual Lyrid meteor shower. Forecasters expect the shower to peak on April 22nd, producing about 10 meteors per hour--modest, but pretty. The best time to look is during the hours before dawn on Saturday morning. Go to a dark site away from city lights, if possible. [full story]

The Moon will also encounter the comet's tail on April 22nd, which raises an interesting possibility: Amateur astronomers may be able to see flashes of light on the Moon when comet debris hits the lunar surface and explodes. All that's required is a backyard telescope and lots of patience.


Simulated lunar Lyrid impacts. Image credit: Pete Gural, SAIC.

Want to try? Train your telescope on the dark side of the Moon, which rises around 3 a.m. on Saturday: sky map. Lyrids will be raining down on the northern third of the visible disk. In the eyepiece, watch for fleeting, point-like flashes. Better yet, let a video camera do the watching for you. Brian Cudnik, who coordinates amateur observations of lunar impacts for the Association of Lunar and Planetary Observers, explains how.

SUN SERPENT: Yesterday, astrophotographer Gary Palmer of Los Angeles, California, claims to have spotted the Loch Ness Monster--on the Sun. You decide:

This fluffy solar filament does indeed resemble a sea serpent. In a few days, though, it'll look like something utterly different. The sun's rotation is carrying the filament toward the sun's limb. Soon, it will hang out over the edge, blazing bright against the black space beyond, transforming a dark serpent into a hot glowing ... what? Stay tuned!

more images: from Mike Taormina of Palatine, Illinois;



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 20 Apr 2006 there were 778 known Potentially
Hazardous Asteroids

April-May 2006 Earth-asteroid encounters
ASTEROID

 DATE
(UT)

MISS DISTANCE

MAG.

 SIZE
(meters)
2006 GY2

May 16

6.7 LD

13+

~0.8 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. 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

You are visitor number 33879668 since January 2000.
©2019 Spaceweather.com. All rights reserved.