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Space Weather Update: 05/04/2016

By, 05/04/2016

METEORS FROM HALLEY'S COMET: Earth is entering a stream of debris from Halley's Comet, source of the annual eta Aquariid meteor shower. Forecasters expect the shower to peak on the nights around May 5th and 6th with 30+ meteors per hour. The best time to look, no matter where you live, is probably during the dark hours before sunrise on Friday.

"Although the shower's peak is still days away, the Canadian Meteor Orbit Radar (CMOR) is already detecting strong activity from the eta Aquariid shower," reports physics professor Peter Brown of the University of Western Ontario. The pink "hot spot" in this all-sky radar map from May 3rd shows the location of the shower's radiant (ETA):


"Processing from last night shows more than 200 eta Aquariids with orbits loosely matching that of comet 1P/Halley," Brown says. "The equivalent visible rates are about 40 per hour – almost one per minute! Based on these numbers it is clear that sky watchers are in for a treat over the next few nights."

Got clouds? No problem. You can still experience this meteor shower by listening to it. Meteor radar echoes are being streamed live on Space Weather Radio.

Realtime Space Weather Photo Gallery

"SPACE LIGHTNING" OVER THE CARIBBEAN: Sprite season is definitely underway. Only a few days after a widespread display appeared over Texas, more sprites have popped up near Puerto Rico. Frankie Lucena photographed them on May 1st from Cabo Rojo:


"They appeared right beside Mars and Saturn in the constellation Scorpius," says Lucena. "The sprites were over the Caribbean Sea just south of Cabo Rojo."

Sprites are an exotic form of upper atmospheric electricity, sometimes called "space lightning" because they reach altitudes associated with meteors, noctilucent clouds and auroras. Some researchers believe they are linked to cosmic rays: Subatomic particles from deep space striking the top of Earth's atmosphere produce secondary electrons that, in turn, could provide the spark that triggers sprites.

Lucena's ocean-going sprites are somewhat unusual. "A satellite study by Chen et al. 2008 (JGR) showed 49% of sprites to occur over land, 28% over the ocean and the remaining ones near the coastlines," explains lightning scientist Oscar van der Velde of the Technical University of Catalonia, Spain. "As oceans cover a greater area, this indicates sprites are more common over land-based storms."

Although sprites have been seen for at least a century, most scientists did not believe they existed until after 1989 when sprites were photographed by cameras onboard the space shuttle. Now "sprite chasers" routinely photograph sprites from their own homes. "They are easily detected by certain cameras," says van der Velde, "and if a storm is in the mood, you may record one every few minutes." Give it a try!

Realtime Sprite Photo Gallery

Realtime Aurora Photo Gallery

Realtime Comet Photo Gallery

 All Sky Fireball Network

Every night, a network of NASA all-sky cameras scans the skies above the United States for meteoritic fireballs. Automated software maintained by NASA's Meteoroid Environment Office calculates their orbits, velocity, penetration depth in Earth's atmosphere and many other characteristics. Daily results are presented here on

On May. 4, 2016, the network reported 30 fireballs.
(18 eta Aquariids, 12 sporadics)



In this diagram of the inner solar system, all of the fireball orbits intersect at a single point--Earth. The orbits are color-coded by velocity, from slow (red) to fast (blue). [Larger image] [movies]


 Near Earth Asteroids

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 May 4, 2016 there were 1697 potentially hazardous asteroids.

Recent & Upcoming Earth-asteroid encounters:Asteroid


Miss Distance


2016 HP6

May 2

8.9 LD

39 m

2016 HD3

May 2

2.2 LD

11 m

2016 JB

May 4

4.1 LD

15 m

2016 HN

May 4

12.4 LD

131 m

2008 TZ3

May 5

13.1 LD

355 m

2014 JG55

May 8

7.6 LD

7 m

2016 GS2

May 18

3.4 LD

109 m

2016 HF3

May 18

8.5 LD

61 m

2009 DL46

May 24

6.2 LD

215 m

1997 XF11

Jun 10

70 LD

1.8 km

2015 XZ378

Jun 13

9.7 LD

16 m

2009 CV

Jun 20

12.4 LD

60 m

2010 NY65

Jun 24

10.7 LD

215 m

Notes: LD means "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.

 Cosmic Rays in the Atmosphere

Situation Report -- Oct. 30, 2015Stratospheric Radiation (+37o N)

Cosmic ray levels are elevated(+6.1% above the Space Age median). The trend is flat. Cosmic ray levels have increased +0% in the past month.

Sept. 06: 4.14 uSv/hr (414 uRad/hr)

Sept. 12: 4.09 uSv/hr (409 uRad/hr)

Sept. 23: 4.12 uSv/hr (412 uRad/hr)

Sept. 25: 4.16 uSv/hr (416 uRad/hr)

Sept. 27: 4.13 uSv/hr (413 uRad/hr)

Oct. 11: 4.02 uSv/hr (402 uRad/hr)

Oct. 22: 4.11 uSv/hr (411 uRad/hr)

These measurements are based on regular space weather balloon flights: learn more.

Approximately once a week, and the students of Earth to Sky Calculus fly "space weather balloons" to the stratosphere over California. These balloons are equipped with radiation sensors that detect cosmic rays, a surprisingly "down to Earth" form of space weather. Cosmic rays can seed cloudstrigger lightning, and penetrate commercial airplanes. Our measurements show that someone flying back and forth across the continental USA, just once, can absorb as much ionizing radiation as 2 to 5 dental X-rays. For example, here is the data from a flight on Oct. 22, 2015:


Radiation levels peak at the entrance to the stratosphere in a broad region called the "Pfotzer Maximum." This peak is named after physicist George Pfotzer who discovered it using balloons and Geiger tubes in the 1930s. Radiation levels there are more than 80x sea level.

Note that the bottom of the Pfotzer Maximim is near 55,000 ft. This means that some high-flying aircraft are not far from the zone of maximum radiation. Indeed, according to the Oct 22th measurements, a plane flying at 45,000 feet is exposed to 2.79 uSv/hr. At that rate, a passenger would absorb about one dental X-ray's worth of radiation in about 5 hours.

The radiation sensors onboard our helium balloons detect X-rays and gamma-rays in the energy range 10 keV to 20 MeV. These energies span the range of medical X-ray machines and airport security scanners.


Current Conditions

Solar wind
speed: 413.3 km/sec
density: 1.7 protons/cm3

explanation | more data
Updated: Today at 1750 UTX-ray Solar Flares
6-hr max: C1
1351 UT May04
24-hr: C1 1351 UT May04
explanation | more data
Updated: Today at: 1700 UTDaily Sun: 04 May 16Not one of these sunspots has the type of unstable magnetic field that poses a threat for strong flares. Solar activity is low. Credit: SDO/HMI

Sunspot number: 57
What is the sunspot number?
Updated 04 May 2016

Spotless Days
Current Stretch: 0 days
2016 total: 0 days (0%) 
2015 total: 0 days (0%) 

2014 total: 1 day (<1%)
2013 total: 0 days (0%)
2012 total: 0 days (0%)
2011 total: 2 days (<1%)
2010 total: 51 days (14%)
2009 total: 260 days (71%)

Updated 04 May 2016

The Radio Sun
10.7 cm flux: 90 sfu

explanation | more data
Updated 04 May 2016

Current Auroral Oval:


Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/OvationPlanetary K-index
Now: Kp= 1 quiet
24-hr max: Kp= 2
explanation | more data
Interplanetary Mag. Field
Btotal: 3.7 nT
Bz: 1.5 nT north

explanation | more data
Updated: Today at 1749 UTCoronal Holes: 04 May 16Solar wind flowing from the indicated coronal hole could reach Earth on or about May 7th. Credit: SDO/AIA.Noctilucent Clouds The southern season for noctilucent clouds began on Dec. 13, 2015. It is expected to end in late February or March 2016.


Switch view: Ross Ice Shelf, Antarctic Peninsula, East Antarctica, PolarUpdated at: 02-12-2016 16:55:02

NOAA Forecasts

Updated at: 2016 May 03 2200 UTC


0-24 hr

24-48 hr


05 %

05 %


01 %

01 %

Geomagnetic Storms:
Probabilities for significant disturbances in Earth's magnetic field are given for three activity levels: activeminor stormsevere stormUpdated at: 2016 May 03 2200 UTCMid-latitudes

0-24 hr

24-48 hr


10 %

10 %


01 %

01 %


01 %

01 %

High latitudes

0-24 hr

24-48 hr


15 %

15 %


15 %

15 %


10 %

10 %