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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: 644.9 km/s
density:
1.8 protons/cm3
explanation | more data
Updated: Today at 2245 UT


X-ray Solar Flares

6-hr max:
M3 2020 UT Jun16
24-hr: M3 2020 UT Jun16
explanation | more data
Updated: Today at 2245 UT

Daily Sun: 16 Jun '05

Sunspot 779 didn't exist two days ago; now it's many times wider than Earth. This fast-growing spot could soon pose a threat for strong solar flares. Departing sunspot 775 unleashed an M4-class flare today. The blast was not Earth-directed. Credit: SOHO/MDI


Sunspot Number: 64
What is the sunspot number?
Updated: 15 Jun 2005

Far Side of the Sun

This holographic image reveals a big sunspot on the far side of the sun. Image credit: SOHO/MDI

Interplanetary Mag. Field
Btotal: 4.5 nT
Bz:
1.8 nT south
explanation | more data
Updated: Today at 2246 UT

Coronal Holes:

A solar wind stream flowing from the indicated coronal hole could reach Earth on June 19th. Image credit: NOAA Solar X-ray Imager


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 2005 Jun 15 2206 UTC
FLARE 0-24 hr 24-48 hr
CLASS M 10 % 10 %
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 2005 Jun 15 2206 UTC
Mid-latitudes
0-24 hr 24-48 hr
ACTIVE 25 % 35 %
MINOR 10 % 25 %
SEVERE 05 % 10 %

High latitudes
0-24 hr 24-48 hr
ACTIVE 35 % 40 %
MINOR 25 % 30 %
SEVERE 10 % 15 %

What's Up in Space -- 16 Jun 2005
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Auroras for Father's Day? It could happen. Sign him up for SpaceWeather PHONE.

IMPACT: A coronal mass ejection (CME) swept past Earth on June 16th at 0900 UT. The impact caused a mild geomagnetic storm, which has since subsided. Sky watchers at high latitudes should remain alert for auroras, however, because a solar wind stream trailing the CME continues to buffet Earth's magnetic field. Intermittent magnetic storming is possible tonight.

JUPITER AND THE MOON: When the sun goes down tonight, step outside and look south. You'll see Jupiter and the Moon side by side. It's a beautiful sight--no telescope required.

Jupiter and the Moon are very bright. Today in Australia, Richard Challis of Adelaide Hills photographed the pair in broad daylight:

"Jupiter was barely visible to the naked eye on account of thin cirrostratus clouds," notes Challis.

STRANGE SHADOW: Glencoe is a misty, moody place in western Scotland, a place full of history and magic. No wonder shadows there look ... a little odd. Ronnie Williams was standing atop Glencoe's sheer Aonoch Eagach mountain ridge on May 25th when he looked down and saw his silhouette lancing strangely into the clouds below:

Atmospheric optics expert Les Cowley explains: "Sunshine through mountain mist has created two effects, one from shadows and the other by a mysterious wave process inside the mist droplets. The highly distorted shadow is the famous 'Brocken Spectre.' It is your shadow stretching away through the mist towards a point directly opposite the sun. The colored rings are a 'Glory' produced when minuscule fog droplets diffract and somehow aided by surface waves reflect sunlight directly backwards. You can see a glory, but not the Brocken Spectre, when looking down at the clouds from an airplane."



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 are on a collision course with our planet, although astronomers are finding new ones all the time.

On 16 Jun 2005 there were 703 known Potentially
Hazardous Asteroids

June-July 2005 Earth-asteroid encounters
ASTEROID

 DATE (UT)

 MISS DISTANCE

 MAG.
2005 LM3

June 3

4.0 LD

 18
2005 LU3

June 4

4.9 LD

 20
2005 LD

June 19

7.1 LD

 17
2000 AG6

July 22

8.7 LD

 20
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

The Sun from Earth -- daily images of our star 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.

Aurora Forecast --from the University of Alaska's Geophysical Institute

Daily Solar Flare and Sunspot Data -- from the NOAA Space Environment Center.

Lists of Coronal Mass Ejections -- from 1998 to 2001

What is an Iridium flare? See also Photographing Satellites by Brian Webb.

What is an Astronomical Unit, or AU?

Mirages: Mirages in Finland; An Introduction to Mirages;

NOAA Solar Flare and Sunspot Data: 1999; 2000; 2001; 2002; 2003; 2004; Jan-Mar., 2005;

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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