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Space Weather Update: 09/30/2016

By, 09/30/2016

NEARLY-SPOTLESS SUN: With the departure of active region AR2597, the sunspot number is dropping to zero again. This continues a year-long trend of falling sunspot numbers that heralds the approach of Solar Minimum. Weekend forecast: blank suns and no solar flares. Free: Space Weather Alerts

NEW MAPS OF THE SOUTH ATLANTIC ANOMALY: Researchers have long known that one of the van Allen Radiation Belts dips down toward Earth over South America, creating a zone of high radiation called "The South Atlantic Anomaly" (SAA). Since its discovery in 1958, the SAA has been shape-shifting, growing larger and intensifying.  A map published just last week in the American Geophysical Union's journal Space Weather Quarterly outlines the anomaly with new precision:


When a spacecraft in low-Earth orbit passes through the anomaly, "the radiation causes faults in spacecraft electronics and can induce false instrument readings," explains Bob Schaefer of the Johns Hopkins University Applied Physics Lab, lead author of the paper reporting the results. "We actually used these spurious signals to map out the radiation environment at an altitude of 850 km."

Specifically, they looked at pulses of noise in an ultraviolet photometer carried aboard many polar orbiting Defense Meteorological Satellite Program (DMSP) satellites. When high-energy protons in the SAA pass through these sensors, theyproduce spurious signals--or, in the case of this study, valuable data. By monitoring the rate of spurious UV pulses, the researchers were able to trace the outlines of the anomaly and monitor its evolution over a period of years.

They found that the anomaly is slowly drifting north and west at rates of 0.16 deg/yr and 0.36 deg/yr, respectively. Currently, it is most intense over a broad region centered on Sao Paulo, Brazil, including much of Paraguay, Uruguay, and northern Argentina. They also detected a seasonal variation: On average, the SAA is most intense in February and again in September-October. In this plot, yearly average counts have been subtracted to reveal the double-peaked pattern:


One maximum coincides with an equinox, but the other does not. The authors were not able to explain the origin of this unexpected pattern.  

The solar cycle matters, too, as the data revealed a yin-yang anti-correlation with sunspots. "During years of high solar activity, the radiation intensity is lower, while during solar quiet years the radiation intensity is higher," writes Schaefer.

According to orthodox thinking, the SAA reaches down from space to within about 200 km of Earth's surface. Below that altitude, its effects should be mitigated by the shielding of Earth's atmosphere and geomagnetic field. To test this idea, and Earth to Sky Calculus have undertaken a program to map the SAA from below using weather balloons equipped with radiation sensors.  Next week we will share the results of our first flight from a launch site in Chile.  Stay tuned!

Realtime Space Weather Photo Gallery

SOLAR WIND STORM: Four days ago, Earth entered a fast-moving stream of solar wind. We're still inside. On Sept. 30th, the solar wind is clocking speeds in excess of 650 km/s (1.5 million mph) with little sign of slackening. This is putting pressure on Earth's magnetic field and sparking auroras around the poles. Ian Griffin photographed the colorful glow last night from Otago, New Zealand:


"A beautiful pastel aurora daubed the sky above Hoopers Inlet on the Otago Peninsula on Sept. 29th," says Griffin. "Despite clouds, the view was absolutely sublime."

More auroras are possible tonight. NOAA forecasters estimate a 35% chance ofG1-class geomagnetic storms on Sept. 30th as the solar wind continues to blow.Free: Aurora Alerts

Realtime Aurora Photo Gallery

Realtime Sprite Photo Gallery


 Cosmic Rays in the Atmosphere

Updated: Sept. 29 2016 // Next Flight: Oct. 1, 2016

Sept. 20, 2016: Readers, thank you for your patience while we continue to develop this new section of We've been working to streamline our data reduction, allowing us to post results from balloon flights much more rapidly, and we have developed a new data product, shown here:


This plot displays radiation measurements not only in the stratosphere, but also at aviation altitudes. Dose rates are expessed as multiples of sea level. For instance, we see that boarding a plane that flies at 25,000 feet exposes passengers to dose rates ~10x higher than sea level. At 40,000 feet, the multiplier is closer to 50x. These measurements are made by our usual cosmic ray payload as it passes through aviation altitudes en route to the stratosphere over California.

What is this all about? 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. Furthermore, there are studies ( #1#2#3#4) linking cosmic rays with cardiac arrhythmias and sudden cardiac death in the general population. Our latest measurements show that cosmic rays are intensifying, with an increase of more than 12% since 2015:


Why are cosmic rays intensifying? The main reason is the sun. Solar storm clouds such as coronal mass ejections (CMEs) sweep aside cosmic rays when they pass by Earth. During Solar Maximum, CMEs are abundant and cosmic rays are held at bay. Now, however, the solar cycle is swinging toward Solar Minimum, allowing cosmic rays to return. Another reason could be the weakening of Earth's magnetic field, which helps protect us from deep-space radiation.

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.

The data points in the graph above correspond to the peak of the Reneger-Pfotzer maximum, which lies about 67,000 feet above central California. When cosmic rays crash into Earth's atmosphere, they produce a spray of secondary particles that is most intense at the entrance to the stratosphere. Physicists Eric Reneger and Georg Pfotzer discovered the maximum using balloons in the 1930s and it is what we are measuring today.

 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 Sep. 30, 2016, the network reported 24 fireballs.
(24 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 September 30, 2016 there were 1731 potentially hazardous asteroids.

Recent & Upcoming Earth-asteroid encounters:Asteroid


Miss Distance


2016 SW3

Sep 26

1 LD

10 m

2016 SX1

Sep 26

2.2 LD

9 m

2016 SG

Sep 27

2.3 LD

21 m

2016 SW1

Sep 28

1.3 LD

9 m

2016 SL2

Sep 29

2.4 LD

35 m

2016 SZ1

Sep 29

6.1 LD

21 m

2009 UG

Sep 30

7.3 LD

101 m

2016 SR2

Oct 7

3.8 LD

22 m

2100 Ra-Shalom

Oct 9

58.3 LD

1.1 km

2014 UR

Oct 18

12 LD

21 m

2005 SE71

Oct 24

72.2 LD

1.0 km

2003 TL4

Oct 27

10.1 LD

565 m

2003 YT1

Oct 31

13.5 LD

850 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.


Current Conditions

Solar wind
speed: 595.8 km/sec
density: 2.6 protons/cm3

explanation | more data
Updated: Today at 1905 UTX-ray Solar Flares
6-hr max: B2
1645 UT Sep30
24-hr: B3 1031 UT Sep30
explanation | more data
Updated: Today at: 1900 UTDaily Sun: 30 Sep 16Departing sunspot AR2597 has a stable magnetic field that poses little threat for strong solar flares. Credit: SDO/HMI

Sunspot number: 17
What is the sunspot number?
Updated 30 Sep 2016

Spotless Days
Current Stretch: 0 days
2016 total: 20 days (7%) 
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 30 Sep 2016

The Radio Sun
10.7 cm flux: 83 sfu

explanation | more data
Updated 30 Sep 2016

Current Auroral Oval:


Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/OvationPlanetary K-index
Now: Kp= 3 quiet
24-hr max: Kp= 4
explanation | more data
Interplanetary Mag. Field
Btotal: 4.7 nT
Bz: 0.8 nT south

explanation | more data
Updated: Today at 1906 UTCoronal Holes: 30 Sep 16
Earth is inside a stream of solar wind flowing from the indicated coronal hole. Credit: NASA/SDO.Noctilucent Clouds NASA's AIM spacecraft has suffered an anomaly, and a software patch is required to fix it. As a result, current noctilucent cloud images will not return until late September 2016.


Switch view: Europe, USA, Asia, PolarUpdated at: 08-06-2016 16:55:02

NOAA Forecasts

Updated at: 2016 Sep 29 2200 UTC


0-24 hr

24-48 hr


01 %

01 %


01 %

01 %

Geomagnetic Storms:
Probabilities for significant disturbances in Earth's magnetic field are given for three activity levels: activeminor stormsevere stormUpdated at: 2016 Sep 29 2200 UTCMid-latitudes

0-24 hr

24-48 hr


40 %

35 %


20 %

15 %


10 %

05 %

High latitudes

0-24 hr

24-48 hr


20 %

15 %


25 %

20 %


35 %

30 %