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SFI: 82 | Ap index:  1  | Kp index:  0  ( n\a @--:--,  n\a @--:--)| X-ray flux:  B4.3 
SW: Density= 1.5 p/cm3 | Speed= 265.2 km/s | Temp=12(x1000)K
IMF: Bx=-0.6nT | By=2.2nT | Bz= 2.1 nT | Bt= 3.1 nT | Lat= 43.1 ° | Lon=106.1°
Sunspots: 27 | Area: 420 10-6/Hemi | New regions: 0
[i]X-ray flares: C=6 M=0 X=0 | Optical flares: M1=1 M2=0 M3=0 | Sub-flares=17
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 2019-03-19 (Week 12)

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

* APL is currently moving equipment in the MOC, and is interested to know what
  instrument workstations can be returned or excessed.

* The SSC reports that all ftp servers at NASA will have to be shut down by
  July 31.  Instrument teams that get their data via ftp from the stereoftp
  server will have to change their scripts to get the data from
  https://stereo-ssc.nascom.nasa.gov.  A new procedure for updating SolarSoft
  is still under development.  The possibility of modifying the commonly used
  Perl mirror script to use ftps instead of ftp was found to be not feasible.
  The sftp protocol is still allowed by NASA, but this requires each user to
  have an account.  It should also be possible to set up an ftps server, and
  the SSC would like to know whether anyone has a desire to use this protocol.


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

* Ahead is operating nominally.

* 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 11 (Mar 11-17)

* On day 071 (Mar 12), during the DSS-14 support for Ahead, turbo decoder lock
  was lost intermittently from 072-0320z through 0356z due to rain at the
  Goldstone complex.  At 0357z command and telemetry lock was lost for the
  remaining 13 minutes of the support due to the antenna auto stowing from high
  winds.  The SSR pointers were repositioned on the next support to minimize
  data loss.  This anomaly resulted in the loss of 13 minutes of commanding,
  telemetry and tracking data.  All SSR data were received.  See DR# G119890
  for more information.

* On day 074 (Mar 15), during the DSS-14 support, instrument real-time command
  and telemetry test with the Ahead observatory using the new MOC command and
  control workstation, software, and CCSDS SLE bluebook version 4 software
  update was conducted.  IMPACT IDPU, SECCHI and SWAVES successfully received
  telemetry.  They each sent commands which were received by the new command
  workstation.  However, due to a time synchronization issue in the MOC, a
  command bind was not established and the commands were not transmitted to the
  observatory.  The IMPACT and SWAVES commands will be sent on the next test
  opportunity on day 080, March 21st.  IMPACT SEP suite, PLASTIC, and SECCHI
  will test at that time as well.

* On day 074 (Mar 15), the 46th SECCHI stepped calibration was executed
  successfully at 1135z for the midpoint in the Ahead orbit.  This calibration
  was repeated due to a contamination event on the COR1 optics after the last
  calibration on day 042, February 11th.  This was the 16th SECCHI stepped
  calibration roll to be conducted without gyro use.

* The average daily science data return for Ahead was 5.2 Gbits during this
  week.

Week 12 (Mar 18-24)

* Telemetry lock was lost around 03:22 yesterday (Mar 18) during the station 43
  support for Ahead.  The SSR pointers were moved, and all SSR data were
  recovered.

* Telemetry lock on Ahead was lost again this morning (Mar 19) during the
  station 63 pass.  The SSR pointers will be moved to avoid data loss.

* Late tomorrow (Mar 20, or early Mar 21 UTC) a Project Interface Test (PIT)
  will be carried out with the DSN during the station 14 pass.  The regular
  operation equipment will be used to carry out the pass, and the MOC backup
  workstation will be connected to the DSN test servers to carry out the test
  in parallel.

* SLE version 4 testing with PLASTIC, IMPACT/SEP, and SECCHI will be carried
  during the station 63 pass starting at 17:55 UT on Thursday, Mar 21.
  The IMPACT/IDPU and SWAVES commands sent during the Mar 15 testing will be
  sent up to the spacecraft; the teams are asked to check if the commands were
  received okay.

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

Week 13 (Mar 25-31)

* Sunday, Mar 31, marks the beginning of the second SECCHI observing campaign
  for Parker Solar Probe.  This campaign goes through day 100 (Apr 10).  

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

Week 14 (Apr 1-7)

* The SECCHI observing campaign for Parker Solar Probe perihelion continues
  throughout the week.  This will include a COR2 deep exposure campaign,
  Apr 1-4.

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

Week 15 (Apr 8-14)

* The SECCHI observing campaign for Parker Solar Probe perihelion ends on
  Wednesday, Apr 10.

* The 118th momentum dump on Ahead is scheduled for Thursday, April 11, with
  ignition starting at 14:00 UT.  This will be the 37th momentum dump without
  using the gyros.

* Ahead has ten passes during the week, and overall coverage is nominal.  There
  are eight passes at 720 kbps, one at 360 kbps, and one at 240 kbps.

Week 16 (Apr 15-21)

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

Week 17 (Apr 22-28)

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


COORDINATED OBSERVATIONS

-------------------------------------------------------------------------------
Scheduled activities for Week 11:

M Mar 11 (070)  
T Mar 12 (071)  
W Mar 13 (072)  
T Mar 14 (073)  
F Mar 15 (074)  Ahead: SECCHI stepped calibration roll, 11:35 UT
		Ahead: SLE testing with instrument teams, DSS-14, 16:50 UT
S Mar 16 (075)  
S Mar 17 (076)  

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

M Mar 18 (077)  
T Mar 19 (078)  
W Mar 20 (079)  
T Mar 21 (080)  Ahead: SLE testing with instrument teams, DSS-63, 17:55 UT
F Mar 22 (081)  
S Mar 23 (082)  
S Mar 24 (083)  

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

M Mar 25 (084)  
T Mar 26 (085)  
W Mar 27 (086)  
T Mar 28 (087)  
F Mar 29 (088)  
S Mar 30 (089)  
S Mar 31 (090)  Ahead:	Begin SECCHI observations for Parker Solar Probe

Notes:

* Parker Solar Probe perihelion pass, Mar 31-Apr 10

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

M Apr 01 (091)  Ahead:	SECCHI/COR2 deep exposure campaign
T Apr 02 (092)  Ahead:	SECCHI/COR2 deep exposure campaign
W Apr 03 (093)  Ahead:	SECCHI/COR2 deep exposure campaign
T Apr 04 (094)  Ahead:	SECCHI/COR2 deep exposure campaign
F Apr 05 (095)  
S Apr 06 (096)  
S Apr 07 (097)

Notes:

* Parker Solar Probe perihelion pass, Mar 31-Apr 10

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

M Apr 08 (098)  
T Apr 09 (099)  
W Apr 10 (100)  Ahead:	End SECCHI observations for Parker Solar Probe
T Apr 11 (101)  Ahead:	Momentum dump, 14:00 UT
F Apr 12 (102)  
S Apr 13 (103)  
S Apr 14 (104)  

Notes:

* Parker Solar Probe perihelion pass, Mar 31-Apr 10

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

M Apr 15 (105)  
T Apr 16 (106)  
W Apr 17 (107)  
T Apr 18 (108)  
F Apr 19 (109)  
S Apr 20 (110)  
S Apr 21 (111)  

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

M Apr 22 (112)  
T Apr 23 (113)  
W Apr 24 (114)  
T Apr 25 (115)  
F Apr 26 (116)  
S Apr 27 (117)  
S Apr 28 (118)  

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

Upcoming events:

Behind events are contingent on recovering the spacecraft.

2019:

* Aug 28-Sep 7		Parker Solar Probe perihelion pass
* Nov 4			Ahead:	Close approach of Parker Solar Probe
* Dec 26		Parker Solar Probe Venus flyby

2020:

* Jan 24-Feb 4		Parker Solar Probe perihelion pass
* 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
* Jun 2-13		Parker Solar Probe perihelion pass
* Jul 11		Parker Solar Probe Venus flyby, in HI2-A field-of-view
* Sep			Ahead:	Switch downlink rate to 480 kbps for 34 meter
* Sep 22-Oct 2		Parker Solar Probe perihelion pass

2021:

* Jan 13-23		Parker Solar Probe perihelion pass
* Feb 20		Parker Solar Probe Venus flyby
* Apr 25-May 4		Parker Solar Probe perihelion pass
* Jul			Behind:	Switch downlink rate to 720 kbps for 34 meter
* Aug			Ahead:	Switch downlink rate to 720 kbps for 34 meter
* Aug 5-15		Parker Solar Probe perihelion pass
* Oct 16		Parker Solar Probe Venus flyby
* Nov 17-26		Parker Solar Probe perihelion pass

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
* 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:

* Mar 19-27		Parker Solar Probe perihelion pass
* Apr 7			Ahead:	Mercury transit
* Jun 15-24		Parker Solar Probe perihelion pass

2026:

2027:

* Feb 1			Behind: Mercury transit

2028:

2029:

* Jun 30		Ahead:	Mercury transit


Courtesy of STEREO/SECCHI consortium.
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