uhoh
  • Member for 5 years, 8 months
  • Last seen this week
  • Taipei, Earth
Is Earth getting heavier or lighter?
Accepted answer
12 votes

tl;dr: The Earth receives 40,000 tons of dust from space every year, but looses 95,000 tons of Hydrogen and 1,600 tons of Helium every year as well. After all additional effects are balanced, the ...

View answer
I just read news that Antarctica had set a new record high temperature, above 18 °C. How can this be the case if it is currently winter there?
5 votes

Supplemental to Jean-Marie Prival's answer: The February 2020 event was already discussed here in a question posted the same day this went public: What is the second thermometer in the image from the ...

View answer
Why are CO2 sensors so expensive when CO sensors aren't?
5 votes

Carbon monoxide (CO), natural gas & hydrocarbons, VOCs, ammonia, etc. In this Chemistry SE answer and this Electronics SE question I discuss how the family of MOS gas sensors work. They can ...

View answer
Have these optical satellite ground station locations been chosen for clear skies?
5 votes

This is just supplemental information to the accepted answer by @gerrit I took the ESA cloud cover fraction map provided there, and added dots that represent the approximate locations of the ground ...

View answer
How can the Simpson Desert be the largest sand dune desert in the world?
4 votes

The linked Wikipedia article has been edited after the OP's question was posted. It now says: The Simpson Desert is a large area of dry, red sandy plain and dunes in Northern Territory, South ...

View answer
wavelength of seismic wave with a gaussian source
4 votes

The Fourier transform of a Gaussian is a Gaussian. If your signal is given by $$g(t)=\frac{1}{\sqrt{2 \pi \sigma^2}} \exp\left( -\frac{(t-t_0)^2}{2 \sigma^2}\right)$$ then your frequency spectrum ...

View answer
Why did a branch against a window prevent condensation?
3 votes

The glass will be receiving heat from the inside and transferring it outside via several mechanisms, both radiant heat in the infrared and conduction/convection by its contact with the warm indoor air ...

View answer
How to find SMAP Satellite acquisiton plan?
3 votes

This is not a satellite acquisition plan, but it may be something to get you started. I've used the Python package Skyfield to get the subsatellite point of SMAP based on the most recent two line ...

View answer
Is there a map that displays every country at its correct relative size?
3 votes

Found in https://twitter.com/amazingmap I can't personally vouch for accuracy. From tweet, several complaints about Antarctica, "wrong pole", etc. New favourite map projection. Hellereal Boreal ...

View answer
What is a Micro-Aethalometer; how do portable Black Carbon (BC) Monitors work?
Accepted answer
3 votes

Following @ Friddy's comment, I started reading Aethlabs AE51 FAQ and was quite surprised! While a conventional aethalometer use a long tape and move it to the new position after each measurement (...

View answer
Why are these patterns of scattered sunlight aligned to the local horizontal and vertical directions?
2 votes

Why are these patterns of scattered sunlight aligned to the local horizontal and vertical directions? The answer can be found in The New York Times article Light Pillars, a Million-Mirror Optical ...

View answer
Pressure Increase in stone and in water
2 votes

Why does the pressure increase only by 0,3-0,4bar per km in stone but 1bar per 10m in water while stone has the higher density? Because it doesn't! Plots in this Physics SE answer and here and here ...

View answer
Transmitter receiver coil separation for Electromagnetic Terrain Conductivity Measurement
2 votes

As described in the question there are two similar coils, one radiates the AC magnetic field ("transmitter") and the other picks up the weak radiated AC magnetic field produced by subsurface ...

View answer
Seismic amplitude distribution
2 votes

I'm sure there are several possible reasons. I'm not a seismologist, this is an amateur answer only. Tidal forces Local acceleration has very small long-term drifts due to tidal forces from the ...

View answer
How to quickly or easily prove the world is spherical?
1 votes

There are some recommendations in the following videos: The Nightly Show - Neil deGrasse Tyson Slams Flat-Earth Theorist B.o.B Neil deGrasse Tyson Rips Kyrie Irving's Flat Earth Nonsense | TMZ ...

View answer
How can I calculate the sensitivity of a seismometer?
Accepted answer
0 votes

This is a partial answer because I'm not an expert and because I don't know what the dynamic range of 137 dB means. Hopefully you can add a little more information. tl;dr: if 137 dB is the dynamic ...

View answer
What is the nature of the "unexpected geomagnetic pulse that took place beneath South America in 2016"?
0 votes

Too long to post as a comment: Just published: Nature Geoscience Geomagnetic jerks and rapid hydromagnetic waves focusing at Earth’s core surface Scrolling to the bottom of the page there are links to ...

View answer