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11:36 UTC
SFI: 72 | Ap index:  6  | Kp index:  1  ( 1 @12:15,  1 @15:15) | X-ray flux:  A4.6 
SW: Density= 1.0 p/cm3 | Speed= 456.8 km/s | Temp=40(x1000)K
IMF: Bx=-1.3nT | By=1.5nT | Bz= 1.7 nT | Bt= 2.7 nT | Lat= 40.7 ° | Lon=132.2°
Sunspots: 12 | Area: 10 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 2017-03-21 (Week 12)

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

* A firewall upgrade at APL is scheduled between 15-17 UT on Apr 8.  The
  instrument teams will have to reconnect after the upgrade.

* The restricted IOnet will be upgraded on Thursday, Apr 13.  See below for
  details.


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 11 (Mar 13-19)

* On day 073 (Mar 14), during the DSS-43 support for Ahead, turbo decoder lock
  was lost intermittently between 0646z and 0702z due to heavy rain at the
  Canberra complex.  This anomaly resulted in the loss of 26,385 frames of
  real-time and SSR data.  As there was sufficient track time, SSR pointers
  were repositioned on the next support to recover the lost data.  While all
  in-situ instrument data was recovered, unfortunately, due to the large volume
  of data recorded by SECCHI in between tracks, the SSR read pointer was
  repositioned behind the write pointer resulting in approximately 10.2 hour
  loss of SECCHI science data from 073-1336z through 2350z.  See DR# C112588
  for more information.  The originally lost SECCHI data from Mar 13 was also
  not recovered.

* On day 074 (Mar 15), during the DSS-63 support for Ahead, turbo decoder lock
  was lost at 1150z.  This anomaly resulted in the loss of one frame of SSR
  data.

* On day 077 (Mar 18), during the DSS-43 support for Ahead, turbo decoder lock
  was lost briefly while still one-way at 0513z, and then lost intermittently
  while two-way between 0641z and 0754z.  This anomaly resulted in the loss of
  58 frames of real-time telemetry and SSR data.  See DR #C112592 for more
  information.

* On day 075 (Mar 16), the 38th SECCHI stepped calibration was executed at
  1350z for midpoint in the Ahead orbit.  This was the 7th SECCHI stepped
  calibration roll to be conducted without gyro use.

* On day 075 (Mar 16), IMPACT requested real-time commanding on Ahead to dump
  RAM and clear a checksum error and to enable burst data which has been
  disabled since before solar conjunction.

* The average daily science data return for Ahead was 5.9 Gbits during this
  week.

* On day 076 (Mar 17), during a 3.75 hour support for Behind with the 34m
  station DSS-26 using the 80 KW transmitter to minimize 70m contentions,
  initial commanding was delayed 9 minutes until 1634z due to the transmitter
  tripping off-line.  After the uplink was restored, 380 commands were
  transmitted during the support.  No commands were lost because of the delay.
  No carrier was detected by the DSN station 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 3 kHz uplink
  range and sending commands for IEM switched power and PDU 1553 interface bus
  off.

* On day 077 (Mar 18), during a 4.5 hour support for Behind with the 34m
  station DSS-26 using the 80 KW transmitter to minimize 70m contentions, 480
  commands were transmitted during the support.  No carrier was detected by the
  DSN station 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 3 kHz uplink range and sending
  commands for IEM switched power and PDU 1553 interface bus off.

* On day 078 (Mar 19), during a 6.5 hour support for Behind with DSS-14, 700
  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 3 kHz uplink range and sending commands for IEM switched power and
  PDU 1553 interface bus off.

* The next recovery attempt for Behind is scheduled for April 14, 15, 16.

Week 12 (Mar 20-26)

* Turbo decoder lock was lost briefly during the station 63 pass for Ahead
  yesterday (Mar 20), resulting in the loss of 8 frames of data.

* 97th momentum dump on Ahead is scheduled for 20:30 UTC tomorrow (Mar 22).
  This will be the 16th momentum dump without using the gyros

* Ahead has 9 passes during the week, and overall coverage is nominal.  There
  are eight passes at 720 kbps and one at 240 kbps.

* There are no passes for Behind during the week.

Week 13 (Mar 27-Apr 2)

* Ahead has 11 passes during the week, and overall coverage is nominal.  There
  are six passes at 720 kbps, four at 240 kbps, and one at 160 kbps.

* There are no passes for Behind during the week.

Week 14 (Apr 3-9)

* A firewall upgrade at APL is scheduled between 15-17 UT on Saturday Apr 8.
  The instrument teams will have to reconnect after the upgrade.  The next
  track starts around 00:25 UT.

* The track schedule for Ahead has increased, due to additional time from
  Spitzer.  Ahead has 10 passes during the week, and overall coverage is
  nominal.  There are eight passes at 720 kbps, and two passes at 240 kbps.

* There are no passes for Behind during the week.

Week 15 (Apr 10-16)

* Passover is between Apr 10-18.  Good Friday is on Apr 14, and Easter is on
  Apr 16.

* On Thursday April 13, there will be an upgrade for the restricted IO net, T1
  link.  Expect to lose IO net connectivity but will re-establish this in the
  MOC.  The outage will be from 1600-2030z.

* A return-to-service demo track for station 25 is scheduled for Thursday, Apr
  13, after the IOnet upgrade.

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

* Recovery attempts for Behind are scheduled for Friday, Saturday, and Sunday,
  Apr 14-16.  The battery recovery track on Friday will use the 80 kW
  transmitter on station 26 with no RSS recording.  The other two tracks will
  use the 70 meter station 14, and will include the Radio Science Receiver.

Week 16 (Apr 17-23)

* Ahead has 9 passes during the week, and overall coverage is nominal.  There
  are eight passes at 720 kbps, and one at 240 kbps.

* There are no passes for Behind during the week.

Week 17 (Apr 24-30)

* The 98th momentum dump on Ahead is scheduled for Monday, Apr 24, with
  ignition at 16:00 UT.  This will be the 17th momentum dump without gyros.

* Ahead has 10 passes during the week, and overall coverage is nominal.  There
  are nine passes at 720 kbps, and on 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.


COORDINATED OBSERVATIONS

-------------------------------------------------------------------------------
Scheduled activities for Week 12:

M Mar 20 (079)  
T Mar 21 (080)  
W Mar 22 (081)  Ahead: 97th momentum dump, 20:30 UT
T Mar 23 (082)  
F Mar 24 (083)  
S Mar 25 (084)  
S Mar 26 (085)  

-------------------------------------------------------------------------------
Scheduled activities for Week 13:

M Mar 27 (086)  
T Mar 28 (087)  
W Mar 29 (088)  
T Mar 30 (089)  
F Mar 31 (090)  
S Apr 01 (091)  
S Apr 02 (092)  

-------------------------------------------------------------------------------
Scheduled activities for Week 14:

M Apr 03 (093)  
T Apr 04 (094)  
W Apr 05 (095)  
T Apr 06 (096)  
F Apr 07 (097)  
S Apr 08 (098)  
S Apr 09 (099)  

-------------------------------------------------------------------------------
Scheduled activities for Week 15:

M Apr 10 (100)  
T Apr 11 (101)  
W Apr 12 (102)  
T Apr 13 (103)  
F Apr 14 (104)  Behind:	Battery recovery track with station 26
S Apr 15 (105)  Behind: Battery recovery track with station 14
S Apr 16 (106)  Behind: Carrier recovery track with station 14

-------------------------------------------------------------------------------
Scheduled activities for Week 16:

M Apr 17 (107)  
T Apr 18 (108)  
W Apr 19 (109)  
T Apr 20 (110)  
F Apr 21 (111)  
S Apr 22 (112)  
S Apr 23 (113)  

-------------------------------------------------------------------------------
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)  

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


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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