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19:45 UTC
SFI: 78 | Ap index:  7  | Kp index:  1  ( 3 @20:30,  5 @23:30) | X-ray flux:  B1.1 
SW: Density= 1.0 p/cm3 | Speed= 409.1 km/s | Temp=57(x1000)K
IMF: Bx=0.2nT | By=-3.7nT | Bz= -3.9 nT | Bt= 5.4 nT | Lat= -46.6 ° | Lon=273.7°
Sunspots: 23 | Area: 110 10-6/Hemi | New regions: 0
[i]X-ray flares: C=0 M=0 X=0 | Optical flares: M1=0 M2=0 M3=0 | Sub-flares=0
Latest images from the Solar Terrestrial Relations Observatory (STEREO - EUVI/COR1/COR2/HI1/HI2)
Downlink from STEREO Behind has been detected during the recovery track on August 21st. More info | All news.



Solar TErrestrial RElations Observatory (or STEREO) employs two nearly identical space-based observatories. One ahead of Earth in its orbit (STEREO A), the other trailing behind (STEREO B) to provide stereoscopic measurements to study the Sun and the nature of its CMEs. Check the current STEREO positions and ground station coverage.



Beacon images
These are the latest received images from both spacecraft. They are generally of lower quality and resolution. Some factors such as Deep Space Network schedule conflicts may result in delaying the beacon images. Check below for the latest high-resolution images (these are normally delayed by up to 72 hours).

Note: Both HI1 and HI2 images are processed using two different methods. You can swap the different versions by clicking on the full-size image in the popup window.


STEREO A (Earth is to the right (post solar conjunction) in EUVI, COR1 and COR2)
Stereo Ahead EUVI 195 Stereo Ahead COR1 Stereo Ahead COR2 Stereo Ahead HI1 Stereo Ahead HI2
EUVI 195Å COR1 COR2 HI1 STARS/HI1 CME HI2 STARS/HI2 CME
Stereo Behind EUVI 195 Stereo Behind COR1 Stereo Behind COR2 Stereo Behind HI1 Stereo Behind HI2
STEREO B (Earth is to the right in EUVI, COR1 and COR2)
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Latest high-resolution images


STEREO A STEREO B (no contact)

EUVI 171Å EUVI 195Å EUVI 284Å EUVI 304Å EUVI 171Å EUVI 195Å EUVI 284Å EUVI 304Å
Stereo Ahead EUVI 171 high resolution Stereo Ahead EUVI 195 high resolution Stereo Ahead EUVI 284 high resolution Stereo Ahead EUVI 304 high resolutionStereo Behind EUVI 171 high resolution Stereo Behind EUVI 195 high resolution Stereo Behind EUVI 284 high resolution Stereo Behind EUVI 304 high resolution COR1 COR1 rdiff COR2 COR2 rdiff COR1 COR1 rdiff COR2 COR2 rdiff
Stereo Ahead COR1 high resolution Stereo Ahead COR1 RDIFF high resolution Stereo Ahead COR2 high resolution Stereo Ahead COR2 RDIFF high resolutionStereo Behind COR1 high resolution Stereo Behind COR1 RDIFF high resolution Stereo Behind COR2 high resolution Stereo Behind COR2 RDIFF high resolution HI1 HI1 rdiff HI1 STARS HI2 STARS HI1 HI1 rdiff HI1 STARS HI2 STARS
Stereo Ahead HI1 high resolution Stereo Ahead HI1 RDIFF high resolution Stereo Ahead HI1 STARS high resolution Stereo Ahead HI2 STARS high resolutionStereo Behind HI1 high resolution Stereo Behind HI1 RDIFF high resolution Stereo Behind HI1 STARS high resolution Stereo Behind HI2 STARS high resolution

note: The "rdiff" COR and HI images use different type of postprocessing called "running difference". It detects the difference between the current and the previous available frame, thus providing a highlight on the subtle details in the images.

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7-day composite videos (updated daily)
NOTE: Contact with STEREO-B has been lost. As a result the videos may not be updated regularly due to insufficient data.


COR1
COR2
HI1
HI2


EUVI-171
EUVI-195
EUVI-284
EUVI-304


COR1, COR2, HI1, HI2
EUVI-171, EUVI-195, EUVI-284, EUVI-304


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Visible planets

STEREO A (Earth is to the right (post solar conjunction))
Visible planets on Stereo Ahead Coronagraph 1 Visible planets on Stereo Ahead Coronagraph 2 Visible planets on Stereo Ahead Heliospheric Imager 1
Visible planets on Stereo Behind Coronagraph 1 Visible planets on Stereo Behind Coronagraph 2 Visible planets on Stereo Behind Heliospheric Imager 1
STEREO B (Earth is to the right)
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IMPACT/PLASTIC solar wind data

Solar wind data plot by IMPACT/PLASTIC
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Status and upcoming events:



STEREO A/B weekly status report from the Mission Operations Center: DOWNLOAD (pdf)



	    STEREO Weekly Meeting Minutes for 2017-04-25 (Week 17)

ANNOUNCEMENTS
-------------

* None.


INSTRUMENT and SPACECRAFT STATUS
--------------------------------

* Ahead is operating nominally on the main lobe of the high gain antenna.

* Attempts to recover Behind have transitioned back to a monthly schedule.


DISCUSSION AND OPERATIONS CONSTRAINTS
-------------------------------------

Week 16 (Apr 17-23)

* On day 112 (Apr 22), during the DSS-14 support for Ahead, turbo decoder lock
  was lost briefly at 113-0125z, and intermittently between 113-0244z and
  0245z.  This anomaly resulted in the loss of 1783 frames of real-time
  telemetry and SSR data.  See DR #N110566 for more information.

* The average daily science data return for Ahead was 6.1 Gbits during this
  week.

Week 17 (Apr 24-30)

* The 98th momentum dump on Ahead was carried out successfully yesterday
  (Apr 24), and imparted an estimated delta-V or 0.089 m/s.

* Early this morning (Apr 25), during the station 43 pass for Ahead, telemetry
  lock was lost intermittently starting at 07:11 UT due to heavy rain.  This
  resulted in the loss of about 32,000 telemetry frames, which is equivalent to
  about 7 minutes.

* There will be a MOC upgrade on Wednesday, Apr 26, starting at 16:00 hours.
  This will be outside of any tracks, and should have no effect.

* Ahead has 11 passes (picked up track 53 on Tuesday for 2 hours courtesy of
  Spitzer) during the week, and overall coverage is nominal.  There are ten
  passes at 720 kbps, and one pass at 160 kbps.

* There are no passes for Behind during the week.

Week 18 (May 1-7)

* Ahead has 8 passes during the week, and overall coverage is nominal.  There
  are seven passes at 720 kbps, and one at 160 kbps.

* There are no passes for Behind during the week.

Week 19 (May 8-14)

* DSN stations will be unavailable for a large part of the day on Thursday,
  May 11 for an exercise in preparation for DSN "Follow the Sun" operations.
  STEREO Ahead has passes just before and just after this exercise, so no
  problems are anticipated.

* The recovery attempt for Behind during the week will use the uplink array
  configuration on Saturday and Sunday, May 13-14, to officially validate the
  technique.  The configuration uses stations 24, 25, and 26 at Goldstone for
  uplink, with the 80 kW transmitter on station 26, and the 70 meter station 14
  for downlink.  The first 1.9 hours will be used with STEREO Ahead for
  calibration.  There will be no SSR playback or instrument commanding during
  these Ahead passes.  After calibration, the stations will switch to Behind
  for 2.8 hours on Saturday, and 3.7 hours on Sunday, as well as station 14 for
  3.4 hours with the Radio Science Receiver.  A waiver has been requested for
  station 26 dipping below the 27.5 degree limit for 45 minutes on Sunday.

* Ahead has 9 tracks during the week and overall coverage is nominal.  There
  are 8 passes at 720 kbps, and one at 160 kbps.

Week 20 (May 15-21)

* Ahead has 12 passes during the week, and overall coverage is nominal.  An
  additional pass with station 63 was added on Sunday, May 21.  There are eight
  passes at 720 kbps, one at 360 kbps, one at 240 kbps, and two at 160 kbps.

* There are no passes for Behind during the week.

Week 21 (May 22-28)

* The 99th momentum dump on Ahead is scheduled for Monday, May 22, with
  ignition at 14:00 UT.  This will be the 18th momentum dump with using the
  gyros.  The dump is being scheduled a week or so early due to track coverage
  limitations.

* Ahead has 8 passes during the week, and overall coverage is nominal.  There
  are seven passes at 720 kbps, and one at 240 kbps.

* There are no passes for Behind during the week.

Week 22 (May 29-Jun 4)

* Monday, May 29, is Memorial Day, which is a holiday at APL.

* There will be an upgrade of the restricted IOnet on Thursday, June 1.  This
  will occur between tracks, and is expected to have no effect.

* Ahead has 8 tracks during the week, and overall coverage is nominal.  There
  are seven tracks at 720 kbps, and one at 160 kbps.

* There are no tracks for Behind during the week.

Week 23 (Jun 5-11)

* Monday, Jun 5, is a backup date for the IOnet upgrade scheduled for the
  previous Thursday.

* Ahead has 9 tracks during the week, and overall coverage is nominal.  There
  are six tracks at 720 kbps, one at 240 kbps, and two at 160 kbps.

* Recovery tracks for Behind are scheduled for Friday, Saturday, and Sunday,
  Jun 9-11.  The first two tracks will use the 80 kW transmitter on station
  26.  The last track will use station 43, and will include the Radio Science
  Receiver.


COORDINATED OBSERVATIONS

-------------------------------------------------------------------------------
Scheduled activities for Week 17:

M Apr 24 (114)  Ahead:	Momentum dump, 16:00 UT
T Apr 25 (115)  
W Apr 26 (116)  
T Apr 27 (117)  
F Apr 28 (118)  
S Apr 29 (119)  
S Apr 30 (120)  

-------------------------------------------------------------------------------
Scheduled activities for Week 18:

M May 01 (121)  
T May 02 (122)  
W May 03 (123)  
T May 04 (124)  
F May 05 (125)  
S May 06 (126)  
S May 07 (127)  

-------------------------------------------------------------------------------
Scheduled activities for Week 19:

M May 08 (128)  
T May 09 (129)  
W May 10 (130)  
T May 11 (131)  DSN stations down for "Follow the Sun" exercise
F May 12 (132)  
S May 13 (133)  Behind:	DSN uplink array recovery attempt
S May 14 (134)  Behind: DSN uplink array recovery attempt

-------------------------------------------------------------------------------
Scheduled activities for Week 20:

M May 15 (135)  
T May 16 (136)  
W May 17 (137)  
T May 18 (138)  
F May 19 (139)  
S May 20 (140)  
S May 21 (141)  

-------------------------------------------------------------------------------
Scheduled activities for Week 21:

M May 22 (142)  Ahead:	Momentum dump, 14:00 UT
T May 23 (143)  
W May 24 (144)  
T May 25 (145)  
F May 26 (146)  
S May 27 (147)  
S May 28 (148)  

-------------------------------------------------------------------------------
Scheduled activities for Week 22:

M May 29 (149)  Memorial Day
T May 30 (150)  
W May 31 (151)  
T Jun 01 (152)  
F Jun 02 (153)  
S Jun 03 (154)  
S Jun 04 (155)  

-------------------------------------------------------------------------------
Scheduled activities for Week 23:

M Jun 05 (156)  
T Jun 06 (157)  
W Jun 07 (158)  
T Jun 08 (159)  
F Jun 09 (160)  
S Jun 10 (161)  
S Jun 11 (162)  

-------------------------------------------------------------------------------


Upcoming events:

Behind events are contingent on recovering the spacecraft.

2017:

2018:

* Mar 5			Ahead:	Mercury transit

2019:

* Mar			Ahead:	Switch downlink rate to 240 kbps for 34 meter
* Apr			Behind:	Switch downlink rate to 240 kbps for 34 meter

2020:

* May			Behind:	Switch downlink rate to 360 kbps for 34 meter
* Jun			Ahead:	Switch downlink rate to 360 kbps for 34 meter
* Jun			Behind: Switch downlink rate to 480 kbps for 34 meter
* Sep			Ahead:	Switch downlink rate to 480 kbps for 34 meter

2021:

* Jul			Behind:	Switch downlink rate to 720 kbps for 34 meter
* Aug			Ahead:	Switch downlink rate to 720 kbps for 34 meter

2022:

2023:

* May 5			Behind:	Mercury transit
* Jul 17		Behind:	Closest approach to Earth
* Aug 13		Ahead:	Closest approach to Earth

2024:

2025:

* Apr 7			Ahead:	Mercury transit

2026:

2027:

* Feb 1			Behind: Mercury transit

2028:

2029:

* Jun 30		Ahead:	Mercury transit


Courtesy of STEREO/SECCHI consortium.
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