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15:50 UTCSFI: 73↓ | Ap index:  8  | Kp index:  2  ( n\a @--:--,  n\a @--:--)| X-ray flux:  n\a 
SW: Density= 1.8 p/cm3 | Speed= 325.6 km/s | Temp=24(x1000)K
IMF: Bx=2.1nT | By=-3.1nT | Bz= -1.2 nT | Bt= 3.9 nT | Lat= -18.1 ° | Lon=304.5°
Sunspots: 24 | Area: 60 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)
Four years after the initial loss of communications anomaly with the Behind observatory, NASA has directed to cease periodic recovery operations with the last support on October 17, 2018.



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 2021-05-11 (Week 19)

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

* None.


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

* Ahead is operating nominally.  PLASTIC is in operational mode, but with a
  high background rate.

* Four years after the initial loss of communications anomaly with the Behind
  observatory, NASA has directed to cease periodic recovery operations with the
  last support on October 17, 2018.


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

Week 18 (May 3-9)

* On day 126 (May 6), during the DSS-35 support for Ahead, turbo decoder lock
  was lost briefly at 0924z.  This anomaly resulted in the loss of five frames
  of SSR data.  The MOPs team repositioned the SSR pointers on the subsequent
  DSS-55 support and recovered all the affected data.

* On day 126 (May 6), the 137th momentum dump on Ahead was executed
  successfully at 2030z, which imparted an estimated delta V of 0.057 m/sec.
  This was the 56th momentum dump conducted without gyro use.  After thruster
  operations completed, there was a 0.4 degree of roll angle error.  Fine
  pointing stabilized 3.8 minutes after completion of the momentum dump.

* As of day 129 (May 9), all PLASTIC systems on Ahead are behaving well, except
  there is a high background count rate, which the team is continuing to
  monitor.

* The average daily science data return for Ahead was 6.6 Gbits during this
  week.

Week 19 (May 10-16)

* Ahead has thirteen passes during the week, and overall coverage is nominal.
  There are eleven passes at 720 kbps, one at 480 kbps, and one at 360 kbps.
  One pass was switched from station 56 to 65 due to maintenance activity.

* A return-to-service track for station 24 is scheduled for Wednesday, May 12,
  between 23:00-02:00 UT.  There will be on instrument commanding or SSR
  playback during this track.

* Between May 13 to Jul 15, the star Betelgeuse will be visible in the HI2
  field-of-view if the spacecraft is rolled by 180 degrees.  MOC will start the
  process of planning these maneuvers.  Because of system momentum, these
  maneuvers cannot start until week 20, probably in the middle of the week.
  MOC suggests performing one roll per week.

Week 20 (May 17-23)

* Ahead has eleven tracks during the week, all at 720 kbps, and overall
  coverage is nominal.

* The Ahead spacecraft will be rolled by 180 degrees on Wednesday, May 19,
  between 18-20 UT to allow the SECCHI HI-2 telescope to observe Betelgeuse.

Week 21 (May 24-30)

* Ahead has eleven tracks during the week, and overall coverage is nominal.
  There are eight tracks at 720 kbps, and three at 480 kbps.

* The Ahead spacecraft will be rolled by 180 degrees on Wednesday, May 26,
  between 20-22 UT to allow the SECCHI HI-2 telescope to observe Betelgeuse.

Week 22 (May 31-Jun 6)

* Ahead has twelve tracks during the week, and overall coverage is nominal.
  There are eight tracks at 720 kbps, and four at 480 kbps.

* Monday, May 31, is Memorial Day, which is a holiday at APL.

* The Ahead spacecraft will be rolled by 180 degrees on Tuesday, Jun 1, between
  16-18 UT to allow the SECCHI HI-2 telescope to observe Betelgeuse.

Week 23 (Jun 7-13)

* Ahead has eleven tracks during the week, and overall coverage is nominal.
  There are ten tracks at 720 kbps, and one at 480 kbps.

* The 58th SECCHI stepped calibration roll is scheduled for Wednesday, Jun 9,
  starting at 16:50 UT.

* The Ahead spacecraft will be rolled by 180 degrees on Friday, Jun 11, between
  20-22 UT to allow the SECCHI HI-2 telescope to observe Betelgeuse.  This will
  be the last 180 degree roll before the next momentum dump.  There will not be
  a roll in week 24, and possibly not in week 25.

Week 24 (Jun 14-20)

* Ahead has twelve tracks during the week, and overall coverage is nominal.
  There are eight tracks at 720 kbps, three at 480 kbps, and one at 360 kbps.

* The 138th momentum dump on Ahead is scheduled for Tuesday, Jun 15, with
  ignition at 15:00 UT.


COORDINATED OBSERVATIONS

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

M May 03 (123)  
T May 04 (124)  End of Parker Solar Probe perihelion pass
W May 05 (125)  
T May 06 (126)  Ahead:	Momentum dump, 20:30 UT
F May 07 (127)  
S May 08 (128)  
S May 09 (129)

Notes:

* Parker Solar Probe perihelion pass, Apr 25-May 4.

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

M May 10 (130)  
T May 11 (131)  
W May 12 (132)  Ahead: Return-to-service track with station 24
T May 13 (133)  
F May 14 (134)  
S May 15 (135)  
S May 16 (136)

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

M May 17 (137)  
T May 18 (138)  
W May 19 (139)  Ahead: 180 degree roll to observe Betelgeuse, 18-20 UT
T May 20 (140)  
F May 21 (141)  
S May 22 (142)  
S May 23 (143)  

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

M May 24 (144)  
T May 25 (145)  
W May 26 (146)  Ahead: 180 degree roll to observe Betelgeuse, 20-22 UT
T May 27 (147)  
F May 28 (148)  
S May 29 (149)  
S May 30 (150)  

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

M May 31 (151)  Memorial Day
T Jun 01 (152)  Ahead: 180 degree roll to observe Betelgeuse, 16-18 UT
W Jun 02 (153)  
T Jun 03 (154)  
F Jun 04 (155)  
S Jun 05 (156)  
S Jun 06 (157)  

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

M Jun 07 (158)  
T Jun 08 (159)  
W Jun 09 (160)  Ahead: SECCHI stepped calibration roll, 16:50 UT
T Jun 10 (161)  
F Jun 11 (162)  Ahead: 180 degree roll to observe Betelgeuse, 20-22 UT
S Jun 12 (163)  
S Jun 13 (164)  

-------------------------------------------------------------------------------
Scheduled activities for Week 24:

M Jun 14 (165)  
T Jun 15 (166)  Ahead: Momentum dump, 15 UT
W Jun 16 (167)  
T Jun 17 (168)  
F Jun 18 (169)  
S Jun 19 (170)  
S Jun 20 (171)  

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


Upcoming events:

Behind events are contingent on recovering the spacecraft.

2021:

* May 13-Jul 15		Betelgeuse visible in SECCHI HI2 with 180 degree roll
* Aug 5-15		Parker Solar Probe perihelion pass
* Aug 9			Solar Orbiter Venus flyby
* Aug 23		Solar Orbiter in quadrature with Earth
* Aug 31		Solar Orbiter METIS roll
* Sep 12-19		Solar Orbiter remote sensing window
* Oct 16		Parker Solar Probe Venus flyby
* Nov 5			Solar Orbiter along Sun-Earth line
* Nov 17-26		Parker Solar Probe perihelion pass
* Nov 27		Solar Orbiter Earth flyby

2022:

* Feb 21-Mar 2		Parker Solar Probe perihelion pass
* May 28-Jun 7		Parker Solar Probe perihelion pass
* Sep 2-11		Parker Solar Probe perihelion pass
* Sep 4			Solar Orbiter Venus flyby
* Dec 7-16		Parker Solar Probe perihelion pass

2023:

* Mar 13-23		Parker Solar Probe perihelion pass
* May 5			Behind: Mercury transit
* Jun 17-27		Parker Solar Probe perihelion pass
* Jul 17		Behind: Closest approach to Earth
* Aug 13		Ahead: Closest approach to Earth
* Aug 21		Parker Solar Probe Venus flyby
* Sep 23-Oct 3		Parker Solar Probe perihelion pass
* Dec 25-Jan 3		Parker Solar Probe perihelion pass

2024:

* Mar 26-Apr 4		Parker Solar Probe perihelion pass
* Jun 26-Jul 5		Parker Solar Probe perihelion pass
* Sep 26-Oct 5		Parker Solar Probe perihelion pass
* Nov 6			Parker Solar Probe Venus flyby, in HI2-A field-of-view
* Dec 20-29		Parker Solar Probe perihelion pass

2025:

* Feb 18		Solar Orbiter Venus flyby
* Mar 19-27		Parker Solar Probe perihelion pass
* Apr 7			Ahead: Mercury transit
* Jun 15-24		Parker Solar Probe perihelion pass

2026:

* Dec 24		Solar Orbiter Venus flyby

2027:

* Feb 1			Behind: Mercury transit

2028:

* Mar 18		Solar Orbiter Venus flyby

2029:

* Jun 10		Solar Orbiter Venus flyby
* Jun 30		Ahead: Mercury transit

2030:

* Sep 3			Solar Orbiter Venus flyby


Courtesy of STEREO/SECCHI consortium.
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