LIVE from College Park...

the latest 48 hours of solar wind data

brought to you by the CELIAS/MTOF Proton Monitor on the SOHO Spacecraft

ISSI video: 25 Years of SOHO and First Glimpses of Parker Solar Probe and Solar Orbiter

talking sun

There is a problem with the motor controlling the High Gain Antenna on the SOHO spacecraft. Science data coverage may be less than complete for 1-2 weeks every 90 days (when the spacecraft gets 'flipped'). The next "keyhole" period can be found in this table.

An energetic particle flare monitor using the PM background rate
An X-ray flare monitor using data from the CELIAS/SEM sensor
ShockSpotter description

blue line

dog

Most Recent Shock Candidates:

Dates

19 Jan 2026

16 Jan 2026

10 Jan 2026

UT

1859

1403

1939

day of year

019

016

010

F/R

fwd

fwd

fwd

Zone

3

1

4

Confidence Level

98%

60%

99%

blue line

Current time in UTC

Two Day PM Plot — Data ending at 1755 GMT on January 29, 2026 (2 minute ascii data)

blue line

Two Week PM Plot — Data ending at 2349 GMT on January 28, 2026 (15 minute ascii data)

blue line

Where is SoHO?

The predicted position of the SOHO spacecraft in the GSE coordinate system (X,Y,Z) in Earth radii at 0610 GMT on Oct 15, 2020:

( 241, 80, -14 )

Daily Orbit Data:

Launch through 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026

blue line

What's being plotted?

What do the colors mean?

About the PM sensor

The SOHO mission

The Proton Monitor (PM) is one of the scientific sensors in the Charge, Element, and Isotope Analysis System (CELIAS) instrument package aboard the SOHO spacecraft.

blue line