You are viewing the page for Sep. 15, 2005
  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: 730.3 km/s
density:
0.8 protons/cm3
explanation | more data
Updated: Today at 2244 UT


X-ray Solar Flares

6-hr max:
M1 1910 UT Sep15
24-hr: M8 0840 UT Sep15
explanation | more data
Updated: Today at 2245 UT

Daily Sun: 15 Sep '05

Sunspot 798 poses a continuing threat for strong X-flares. Credit: SOHO/MDI


Sunspot Number: 86
What is the sunspot number?
Updated: 14 Sep 2005

Far Side of the Sun

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

Interplanetary Mag. Field
Btotal: 5.3 nT
Bz:
1.5 nT north
explanation | more data
Updated: Today at 2246 UT

Coronal Holes:

There are no large coronal holes on the Earth-facing side of the sun.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 Sep 14 2216 UTC
FLARE 0-24 hr 24-48 hr
CLASS M 75 % 70 %
CLASS X 50 % 40 %

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 Sep 14 2216 UTC
Mid-latitudes
0-24 hr 24-48 hr
ACTIVE 10 % 35 %
MINOR 20 % 20 %
SEVERE 60 % 10 %

High latitudes
0-24 hr 24-48 hr
ACTIVE 10 % 35 %
MINOR 20 % 35 %
SEVERE 70 % 20 %

What's Up in Space -- 15 Sep 2005
Subscribe to Space Weather News

Would you like a call when auroras are brewing over your hometown? Sign up for SpaceWeather PHONE.

SOLAR MINIMUM EXPLODES: With so much activity on the sun, solar minimum is looking strangely like Solar Max. Get the full story from Science@NASA.

AURORA WATCH: High-latitude sky watchers should be alert for auroras tonight. A fast solar wind stream is buffeting Earth's magnetic field, causing mild to moderate geomagnetic storms. This comes in the wake of a CME that swept past Earth this morning. At first the CME did little to spark auroras, but now the storm is intensifying, raising hopes for a display tonight.

Above: Northern Lights over Wasilla, Alaska, on Sept 15th. Photo credit: Penny Gillen.

The source of the CME was sunspot 798. That giant 'spot is still facing Earth and crackling with solar flares. More CMEs and auroras are therefore possible in the days ahead.

September 2005 Aurora Gallery

HARVEST MOON: Step outside tonight at sundown and look for the bright moon rising in the east. That's the Harvest Moon, the full moon closest to the beginning of northern Fall.

There's something special about the Harvest Moon; do you know what? Get the answer from Science@NASA.


The full Moon, photographed by Shahriar Davoodian of Iran.

TEACHERS AND HOMESCHOOLERS: Sign up for Sky Calls to get lesson plans and activities--and phone alerts--about ongoing events in the sky: samples.



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 15 Sep 2005 there were 710 known Potentially
Hazardous Asteroids

August 2005 Earth-asteroid encounters
ASTEROID

 DATE (UT)

 MISS DISTANCE

 MAG.
1992 UY4

August 8

16 LD

 12
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

You are visitor number 33456725 since January 2000.
©2019 Spaceweather.com. All rights reserved.