Brian
@drbwalsh.bsky.social
Space science explorer and professor at Boston University. Space sensor builder
Good views west of Boston tonight
November 12, 2025 at 2:50 AM
Good views west of Boston tonight
Magnetopause already compressed inward past geostationary orbit. GOES-18 is in the magnetosheath
November 12, 2025 at 12:46 AM
Magnetopause already compressed inward past geostationary orbit. GOES-18 is in the magnetosheath
Power on! That small step function is the first power on in space of the COSSMo instrument from yesterday. The BU student-developed payload is on the Carruthers Geocoronal Observatory and will monitor the sun in UV and soft X-ray. #heliophysics
October 5, 2025 at 1:38 AM
Power on! That small step function is the first power on in space of the COSSMo instrument from yesterday. The BU student-developed payload is on the Carruthers Geocoronal Observatory and will monitor the sun in UV and soft X-ray. #heliophysics
A small experiment - over the past 2 months I saved all the junk mail I received, ~7.1 lbs. Projecting to the number of adults in the US, that’s 813 million pounds of unsolicited mail every month in the US
August 7, 2025 at 1:09 PM
A small experiment - over the past 2 months I saved all the junk mail I received, ~7.1 lbs. Projecting to the number of adults in the US, that’s 813 million pounds of unsolicited mail every month in the US
Motivating to be part of 450 US space scientists in Des Moines this week. My favorite line of the workshop “whether they know it or not, everyone in this country is becoming a space worker” in reference to the growing reliance of daily life on the space environment
June 27, 2025 at 7:28 PM
Motivating to be part of 450 US space scientists in Des Moines this week. My favorite line of the workshop “whether they know it or not, everyone in this country is becoming a space worker” in reference to the growing reliance of daily life on the space environment
LEXI made it to lunar orbit. 2 weeks to landing and X-ray imaging
February 16, 2025 at 2:19 PM
LEXI made it to lunar orbit. 2 weeks to landing and X-ray imaging
One of the most exciting step-functions in electrical current I’ve seen. Lexi powering up successfully shortly after reaching orbit. ☀️
January 27, 2025 at 4:16 PM
One of the most exciting step-functions in electrical current I’ve seen. Lexi powering up successfully shortly after reaching orbit. ☀️
T-8 hrs to launch. Weather in FL is looking good
January 14, 2025 at 9:49 PM
T-8 hrs to launch. Weather in FL is looking good
In 1651 if you wanted to bash someone’s idea you wrote a book with a gorgeous art critique. It looks like Riccioli didnt like geocentrism
If there’s room you could also include one of the first maps of the moon defining many of the names we use today. Thanks to #bostonpubliclibrary for sharing
If there’s room you could also include one of the first maps of the moon defining many of the names we use today. Thanks to #bostonpubliclibrary for sharing
January 10, 2025 at 1:30 PM
In 1651 if you wanted to bash someone’s idea you wrote a book with a gorgeous art critique. It looks like Riccioli didnt like geocentrism
If there’s room you could also include one of the first maps of the moon defining many of the names we use today. Thanks to #bostonpubliclibrary for sharing
If there’s room you could also include one of the first maps of the moon defining many of the names we use today. Thanks to #bostonpubliclibrary for sharing
de Magnete (1600) by Gilbert started magnetospheric physics. Earth is a magnet! When this was written this also resolved a debate of why compasses pointed north. Thanks to BPL Special Collections for sharing an original copy.
#heliophysics
#heliophysics
December 20, 2024 at 4:35 PM
de Magnete (1600) by Gilbert started magnetospheric physics. Earth is a magnet! When this was written this also resolved a debate of why compasses pointed north. Thanks to BPL Special Collections for sharing an original copy.
#heliophysics
#heliophysics
Two months out from launch! LEXI’s science mission ends when the sun and Earth are too close in the sky to image earths magnetic field without solar background. From LEXI and the moon, this is “new Earth.” From Earth’s perspective - a full moon. Graphic from @firefly-aerospace.bsky.social
November 27, 2024 at 3:34 PM
Two months out from launch! LEXI’s science mission ends when the sun and Earth are too close in the sky to image earths magnetic field without solar background. From LEXI and the moon, this is “new Earth.” From Earth’s perspective - a full moon. Graphic from @firefly-aerospace.bsky.social
Back to Helsinki with the Vlasiator team for more sabbatical numerical simulations. I’ve been told February is still the “dark” part of the year here
February 27, 2024 at 11:59 AM
Back to Helsinki with the Vlasiator team for more sabbatical numerical simulations. I’ve been told February is still the “dark” part of the year here