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SFI: 71= | Ap index:  24  | Kp index:  4  ( 4 @05:30,  5 @08:30)| X-ray flux:  A4.0 
SW: Density= 3.4 p/cm3 | Speed= 612.3 km/s | Temp=324(x1000)K
IMF: Bx=-5.5nT | By=3.6nT | Bz= -1.2 nT | Bt= 6.7 nT | Lat= -10.6 ° | Lon=147.2°
Sunspots: 0 | Area: 0 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 2016. 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 2017-12-12 (Week 50)

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

* The Dec 26 STEREO weekly planning meeting is canceled.


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

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

* Behind has transitioned to a weekly schedule to attempt to recover the
  spacecraft.  Passes are scheduled approximately every three days to keep
  within the 72 hour command loss timer.  Typically, two of those days use a
  search pattern consisting of two diamonds, based on the estimated uncertainty
  in the ephemeris.  The double diamond pattern is executed twice, once to send
  commands, and then again 40 minutes later to listen for the carrier.  An
  additional pass uses the standard configuration.  In some cases, the older
  "1 kHz" frequency acquisition sequence is used, with one day for battery
  recovery, and another for carrier recovery.


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


Week 49 (Dec 4-10)

* On day 339 (Dec 5) the 41st SECCHI stepped calibration was executed at 0855z for
  perihelion in the Ahead orbit.  This was the 10th SECCHI stepped calibration roll
  to be conducted without gyro use.   

* On day 339 during a 3.1 hour 4 kHz carrier recovery search pattern support for Behind
   with DSS-63, 320 commands were transmitted during the support for carrier recovery.  No
   carrier was detected by either the DSN station or the radio science receiver team.  All 7
   points on the pattern were covered twice.  Three commands must be received sequentially to
   power on the transmitter.     

* On day 340 (Dec 6), during the DSS-35 support, telemetry binds were dropped at 0532z on
   both Ahead and Behind command workstations due to a NASCOM network issue.  This anomaly
   resulted in the loss of 3.4 hours of real-time telemetry, commanding, and monitor data.
   All SSR data was received. 

* On day 342 (Dec 8), the STEREO project received authorization to continue ESA cross
   support for 2018. 

* On day 343 (Dec 9), during the DSS-63 support for Ahead, initial acquisition of
   telemetry was 3 minutes late at 1533z due to a connection engine issue at the controlling
   complex. Later in the support, turbo decoder lock was lost intermittently between 1606z
   through 1607z. These anomalies resulted in the loss of 3 minutes of real-time telemetry
   and monitor data and 322 frames of SSR data.  See DR #M110372 for more information. 
 
* On day 343, during a 3 hour 4 kHz carrier recovery support for Behind with DSS-63, 320
   commands were transmitted during the support.  No carrier was detected by either the DSN
   station or the radio science receiver team after attempting to power on the TWTA for 30
   minutes. Transitioned to battery recovery operations for the remainder of the support
   which consists of repeatedly sweeping a 4 kHz uplink range and sending commands for IEM
   switched power and PDU 1553 interface bus off.

* On day 344 (Dec 10), during the DSS-63 support for Ahead, turbo decoder lock was lost
   intermittently between 1200z through 1205z.  This anomaly resulted in the loss of 169
   frames of real-time telemetry and SSR data. 

* The average daily science data return for Ahead was 5.4 Gbits during this week. 

Week 50 (Dec 11-17)

* Ahead has 17 tracks during the week, and overall coverage is now nominal.
  Two 70 meter passes for Behind have been reallocated to Ahead. There are
  three passes at 720 kbps, five at 360 kbps, one at 240 kbps, and eight at 160
  kbps.  Using the stations 25 & 26 to maintain data return on Ahead.

* A single recovery attempt for Behind is scheduled for Thursday, Dec 14.
  Two recovery tracks were switched to Ahead to maintain data return.

Week 51 (Dec 18-24)

* Thursday, Dec 21st, the 105th momentum dump on Ahead is scheduled with
  ignition at 16:00 UT.  This will be the 24th dump without using the gyros.

* Ahead has 14 tracks during the week, and overall coverage is nominal.  There
  are three passes at 720 kbps, two at 360 kbps, and nine at 160 kbps.

* A Behind recovery attempt is scheduled for Saturday, Dec 23. The Saturday
  attempt will be a double diamond search pattern for carrier recovery.  Two
  recovery tracks needed to be reallocated to Ahead.

Week 52 (Dec 25-31)

* Monday, Dec 25, is Christmas Day which is an APL holiday.

* Tuesday Dec 26 STEREO weekly planning meeting is canceled.

* Ahead has 13 tracks during the week, and overall coverage is nominal.  There
  are five passes at 720 kbps, two at 360 kbps, two at 240 kbps, and four at
  160 kbps.

* Behind recovery attempts are scheduled for Monday, Dec 25 (battery search
  pattern), Wednesday, Dec 27 (carrier search pattern), and Saturday, Dec 30
  (nominal 4kHz carrier recovery).

Week 1 (Jan 1-7)

* January 1 is the New Year holiday.

* Ahead has 15 tracks during the week, and overall coverage is nominal.  There
  are seven tracks at 720 kbps, two at 360 kbps, five at 240 kbps, and one at
  160 kbps.

* There are four recovery attempts for Behind during the week.  A 1 kHz
  frequency acquisition pass for battery recovery will be carried out Monday,
  Jan 1, with the subsequent carrier recovery pass on Tuesday, Jan 1.  Search
  pattern attempts will be carried out on Friday, Jan 5, for battery recovery,
  and Sunday, Jan 6, for carrier recovery.

Week 2 (Jan 8-14)

* Ahead has 14 tracks during the week, and overall coverage is nominal.  There
  are seven tracks at 720 kbps, one at 360 kbps, three at 240 kbps, and three
  at 160 kbps.

* Recovery attempts for Behind using the 1 kHz frequency acquisition sequence
  are scheduled on Tuesday, Jan 9 (battery) and Friday, Jan 12 (carrier).  A
  search pattern for battery recovery is scheduled for Sunday, Jan 14.

Week 3 (Jan 15-21)

* Ahead has 16 tracks during the week, and overall coverage is nominal.  There
  are six track at 720 kbps, eight at 240 kbps, one at 360 kbps and one at 160 kbps.

* A carrier recovery search pattern track for Behind is scheduled for Tuesday,
  Jan 16.  Recovery tracks using the 1 kHz frequency acquisition sequence are
  scheduled for Thursday, Jan 18 (battery), and Saturday, Jan 20 (carrier).
  
* Jan 15 is Martin Luther King Jr. Day, a US government holiday.  
  
Week 4 (Jan 22-28)

* On Wednesday Jan 24  Behind would resume 125 bps uplink on LGA assuming nominal
   operations.

* Ahead has 13 tracks during the week, and overall coverage in nominal. There are seven
  tracks at 720 kbps, two at 360 kbps, and four at 240 kbps.

* Weekly recovery operations for Behind continue. A battery recovery search pattern track is
   scheduled for Tuesday, Jan 23, and the corresponding carrier recovery search pattern track
   will be on Friday, Jan 26. On Sunday, Jan 28 a battery recovery 1 kHz sweep sequence is
   scheduled.

Other

* The SECCHI HI team has requested an off-point maneuver for stray light calibration.  This
  involves moving by up to 1 degree in the Y direction. This will be the first time this
  maneuver will be performed without using the gyros.  The MOC expects to be able to perform
  this maneuver possibly later this month. They are currently testing it on the hardware
  simulator with approximately 12 minute duration steps.  The guide telescope will be
  disabled. The SECCHI team also has to make changes to their procedures, and will discuss a
  time for scheduling the maneuver once the MOC is ready.
  
* From the radiometric data analysis of the STEREO BEHIND recovery track on Dec 1st, day
   335, with DSS-65, GSFC noted some unusual RF results.  During this support, the MOC
   received 4 possible carrier lock indications, which based on signal levels, did not appear
   to be an actual signal.  The DSN RSR team is investigating.

* There is a leap second at the start of 2018. However, STEREO does not have any tracks that
   bridge Dec 31 and Jan 1 and would be directly impacted.
  
* STEREO switched over to DSN's Follow the Sun Operations on Nov. 6. DSN would like to
   know if there have been any issues. Misson Ops has two or three they will send in to be
   forwarded to the Follow the Sun Operations Manager.


COORDINATED OBSERVATIONS

-------------------------------------------------------------------------------
Scheduled activities for Week 50:

M Dec 11 (345)
T Dec 12 (346)
W Dec 13 (347)
T Dec 14 (348)  Behind: Recovery track, DSN 63
F Dec 15 (349)
S Dec 16 (350)
S Dec 17 (351)

-------------------------------------------------------------------------------
Scheduled activities for Week 51:

M Dec 18 (352)
T Dec 19 (353)
W Dec 20 (354)
T Dec 21 (355)  Ahead:    Momentum dump, 16:00 UT
F Dec 22 (356)
S Dec 23 (357)  Behind: Recovery track, DSN 14 (search pattern, carrier)
S Dec 24 (358)

-------------------------------------------------------------------------------
Scheduled activities for Week 52:

M Dec 25 (359)  Christmas
                          Behind: Recovery track, DSN 63 (search pattern, battery)
T Dec 26 (360)
W Dec 27 (361)  Behind: Recovery track, DSN 63 (search pattern, carrier)
T Dec 28 (362)
F Dec 29 (363)  Behind: Recovery track, DSN 14
S Dec 30 (364)
S Dec 31 (365)

-------------------------------------------------------------------------------
Scheduled activities for Week 01:

M Jan 01 (001)  New Year
                        Behind: Recovery track, DSN 14 (1 kHz, battery)
T Jan 02 (002)  Behind: Recovery track, DSN 63 (1 kHz, carrier)
W Jan 03 (003)
T Jan 04 (004)
F Jan 05 (005)  Behind: Recovery track, DSN 63 (search pattern, battery)
S Jan 06 (006)
S Jan 07 (007)  Behind: Recovery track, DSN 14 (search pattern, battery)

-------------------------------------------------------------------------------
Scheduled activities for Week 02:

M Jan 08 (008)
T Jan 09 (009)  Behind: Recovery track, DSN 63 (1 kHz, battery)
W Jan 10 (010)
T Jan 11 (011)
F Jan 12 (012)  Behind: Recovery track, DSN 63 (1 kHz, carrier)
S Jan 13 (013)
S Jan 14 (014)  Behind: Recovery track, DSN 14 (search pattern, battery)

-------------------------------------------------------------------------------
Scheduled activities for Week 03:

M Jan 15 (015)
T Jan 16 (016)  Behind: Recovery track, DSN 63 (search pattern, battery)
W Jan 17 (017)
T Jan 18 (018)  Behind: Recovery track, DSN 14 (1 kHz, battery)
F Jan 19 (019)
S Jan 20 (020)  Behind: Recovery track, DSN 63 (1 kHz, carrier)
S Jan 21 (021)

-------------------------------------------------------------------------------
Scheduled activities for Week 04:

M Jan 22 (022)
T Jan 23 (023)  Behind: Recovery track (search pattern, battery)
W Jan 24 (024)
T Jan 25 (025)  
F Jan 26 (026)  Behind: Recovery track (search pattern, carrier)
S Jan 27 (027)  
S Jan 28 (028)  Behind: Recovery track (1 kHz, battery)

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


Upcoming events:

Behind events are contingent on recovering the spacecraft.

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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