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Questions tagged [earth-observation]

Observations recorded on earth.

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Is the surface of the Indian ocean really 106 meters below sea level?

CNN's July 24, 2023 There is a ‘gravity hole’ in the Indian Ocean, and scientists now think they know why links to the Geophysical Research Letter (Pal & Ghosh 2023) How the Indian Ocean Geoid Low ...
uhoh's user avatar
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5 votes
3 answers
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What criteria determines whether earthquakes are classified as new or aftershocks?

I saw a recent paper where it is claimed that aftershocks can occur years, decades or centuries after the main earthquake. When seismic activity is observed, what criteria determines the ...
Prem's user avatar
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4 votes
1 answer
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What's the strongest earthquake we currently can miss observing on Earth?

Reading jeffronicus' answer about how seismic stations record bomb explosions, particularly the reminder that the intensity of earthquakes drops by distance, made me start wondering what scale of ...
JeopardyTempest's user avatar
2 votes
1 answer
244 views

Are seismometers over the world "feeling" the small earthquakes caused by air raids and shelling on Gaza Strip?

When watching news about earthquakes, I think most people are used to hear about the Richter scale, a logarithmic scale used to measure earthquake intensity. A very strong earthquake, like the 2011 ...
ksousa's user avatar
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1 answer
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What is the ultimate limit of horizontal visibility in Earth's atmosphere? [closed]

When meteorological conditions are favorable for generally unlimited visibility, does that mean the atmosphere is sufficiently clear under these conditions that horizontal visibility is truly ...
KeShAw's user avatar
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1 vote
2 answers
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Why is U used for relative humidity in atmospheric measurement equipments?

RH is the symbol of relative humidity in many textbooks. But, in my experience, U is often used in atmospheric measurements. For example, Vaisala PTU300 means pressure, temperature and humidity. I ...
Oone's user avatar
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1 answer
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Im trying to find a formula to calculate Earths radius/ diameter by horizontal cross section to see what effect that has on size of the moon appears

Todays Biue Moon (that wont happen again til 2036) is the biggest brightest and closest the moon is to Earth Im trying to determine how it appears at ones given latitude.Obviously the closest one is ...
Frederick Frank's user avatar
10 votes
7 answers
3k views

How can one know the correct direction on a cloudy day?

On a sunny day, one can find the direction (NESW) by observing the Sun's movement across the sky. In the northern hemisphere, during a clear night, one can find the direction by looking at Polaris or ...
YYY's user avatar
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1 answer
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From where can I download NCEP Vertical wind?

I want to download Vertical Velocity (Pa/sec) data either in era interim or NCAR data from a website. Please I need the link.
user28799's user avatar
1 vote
0 answers
67 views

Determine cloud type on the picture

I'm struggling to determine a cloud type on the photo below (I assume it is a Cirrus cloud and wind shear also depicted there, correct me if I'm wrong).
pacman's user avatar
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6 votes
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Why is the ρστ absorption band called the ρστ absorption band?

Differential absorption in the near-infrared is used to retrieve total column water vapour from MODIS (Gao and Kaufman, 2003), OLCI (Preusker et al., 2021), and others. The idea is that reflected ...
gerrit's user avatar
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-1 votes
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How is sea water level on the Earth a plane?

The Earth is has a globular shape and sea water level is a plane. We are on the upper surface of the Earth, then how is sea water level a plane?
015ra's user avatar
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6 votes
2 answers
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Why does Earth's atmosphere have a whiter color near the horizon?

Why does Earth's atmosphere have a whiter color (paler) near the horizon? (on a clear, cloudless day when the sun is highest in the sky)? The amount of air being greater in this direction, why is the ...
Sebastyen Laroche's user avatar
5 votes
1 answer
1k views

Strange Circular Rays showing up on radar

Can anyone explain these strange rays? They seem to be pulsing in roughly the same location when you watch the radar and are always in the same circle pattern. Thanks for your input!
Sabine's user avatar
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4 votes
1 answer
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Cluster of cow burps now mapped; which satellites contribute to GHGSat's high-resolution maps of ppb levels of methane emission? How do they do it?

CNN's April 30, 2022 Planet-warming emissions from cow burps have been seen from space begins: The emissions were detected by environmental data company GHGSat's high-resolution satellites in ...
uhoh's user avatar
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1 vote
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Creating composite dropsonde profiles?

I am working with 13 dropsonde profiles that were launched during a field program. I have been attempting to create composite profiles of them using python, but I am a bit stuck. Here are the issues ...
mpletch1's user avatar
2 votes
2 answers
140 views

How does atmospheric pressure remains constant even though we have released 43 billion tons of $\ce{CO2}$ in one year?

I've heard that the concentration of CO2 has been increased in the air. It should have increased atmospheric pressure, right?
ChandraKumar's user avatar
1 vote
1 answer
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Source for USGS (probably not) seismic map of La Habra, California (Publication Date April 15, 1998)

I'm trying to find to original source (especially high quality version) of this conservation seismic map. I know that it probably came from USGS (or not) but looks like it out of print? I tried to ...
Trung0246's user avatar
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9 votes
1 answer
664 views

Why does this shoreline change this way?

There are different reasons why a shoreline can change, including tides. But I've found a phenomenon that I can't explain. It happens in a Mediterranean beach called L'Esparrelló/La Caleta (link to ...
Ivan's user avatar
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1 vote
1 answer
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Does the Sun and Moon basically appear to "move on the sky" identically regardless of location and date? [closed]

For a long time, I've been trying to use Stellarium (simulation) and many visualizations and animations in order to get a good idea of how the Sun and Moon move across the sky, as seen by a human from ...
MooMoo's user avatar
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5 votes
0 answers
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Why is the Regener-Pfotzer maximum (radiation in upper atmosphere) above central California?

The site https://spaceweather.com/ has a section called Space Weather Balloon Data which shows the image below and says: The data points in the graph above correspond to the peak of the Regener-...
uhoh's user avatar
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12 votes
3 answers
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Comparing the Earth with a basketball?

(Please excuse my English) The picture above is an image of the Earth without water. We know that the picture above is a very exaggerated one. If the Earth were to shrink to the size of the picture ...
pdh0710's user avatar
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3 votes
2 answers
992 views

Measuring the circumference of the earth - revisited

I have done a bit of research on this topic already and the easiest way seems to be the experiment by Eratosthenes. We pick two locations on the same latitude (of which we know the distance) and then ...
Fullk33's user avatar
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2 votes
1 answer
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How to obtain the saturation point of a soil layer from the volumetric soil water content data?

Would you please let me know if the following is accurate as an answer to the question: Suppose we have sensors which measure the volumetric soil water content of a soil layer for a long period (more ...
Alireza Amani's user avatar
1 vote
1 answer
88 views

Where to find reliable snowfall rate data?

Would you please let me know where I can find/download reliable snowfall rate datasets? I am looking for multiple weather stations (in different regions) or field measured data, that contain both ...
Alireza Amani's user avatar
1 vote
0 answers
210 views

How high must one be to see the curvatue of the earth with the naked eye? [duplicate]

I have read the various answers to this question provided by people with a higher intellect than me, however I am still confused. Even from the ISS your view is to the horizon some 1,435 miles in all ...
steve wilkes's user avatar
1 vote
1 answer
86 views

Have cosmic ray muons or solar neutrinos been used to probe inside the Earth?

By looking at the attenuation of cosmic ray muons passing through pyramids as a function of their direction, it seems it is possible to "look inside" by mapping their 3D density distributions. ...
uhoh's user avatar
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3 votes
1 answer
109 views

What Earth Science research will be done from the International Space Station?

The April 9, 2020 NASA press release NASA Astronaut Chris Cassidy, Crewmates Arrive Safely at Space Station mentions: It is the third spaceflight for Cassidy and Ivanishin and the first for Vagner, ...
uhoh's user avatar
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5 votes
1 answer
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What is the use of HV or VH polarization in Radar?

Radar is a common tool in remote sensing, it is a so-called active instrument, hence it emits and receives energy. Modern Syntethic Aperture Radar (SAR) systems are capable of both transmitting and ...
ckrk's user avatar
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0 answers
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Earth's Electricity

This question s titled according to of one of the Nikola Tesla's patents. There he stated that lightning generates electric waves in Earth. "In the course of certain investigations which I carried ...
Marino's user avatar
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7 votes
1 answer
631 views

What is this narrow band of clouds?

I came across a narrow streak of clouds in Asia when playing with Google Earth. Does anyone know what that is?
Code42's user avatar
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4 votes
0 answers
45 views

Which unsupervised classification method for non linear multivariate time series earth observation data in python

I have collect several data sets for a small region in Germany called Hessisches Ried (about 90 km²) from different sources for a time period from 2015 to 2019. Daily rainfall amount & daily ...
till Kadabra's user avatar
3 votes
0 answers
41 views

Earth's magnetic and electric field in Hilly Areas

Can you please guide me as to what is the intensity of earth's magnetic and electric fields in different regions of earth. Also, specifically in case of hilly or mountainious regions.
Ruchi Gadiya's user avatar
36 votes
3 answers
16k views

Does gravity increase the closer to the core you get?

Or does the mantle and crust above you counteract the increase at one point and it actually decreases?
HingedHD's user avatar
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12 votes
3 answers
2k views

How is global greenhouse gas emission calculated?

I am sure there are different methodologies to arrive at such a number. Can someone in layman terms describe some of the most widely used and trusted methods and what data are used? Sorry I am outside ...
RicardoR's user avatar
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3 votes
0 answers
33 views

Why are Nowcasting SAF daytime products apparently truncated at solar angles of 20° (rather than the documented 10°)?

This image shows the Nowcasting Satellite Application Facility (NWCSAF) Cloud Liquid Water Path (LWP) product for 2020-01-08T12:00:00Z: Cloud LWP from NWCSAF. Source: NWCSAF. The Algorithm ...
gerrit's user avatar
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8 votes
3 answers
7k views

Can I see curvature of the Earth on a picture

I've been piloting a drone yesterday and made a video hovering at around 100m, the visibility was very good. I've shown the video to a friend of mine and we were arguing whether it's the curvature of ...
mmm's user avatar
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1 vote
1 answer
63 views

Is there a name for a "moving meridian" corresponding to particular solar time?

Imagine a meridian that moves over the Earth's surface such that it remains at the longitude that corresponds to a particular solar time (e.g. midday). This meridian would remain stationary relative ...
Museful's user avatar
  • 113
4 votes
0 answers
23 views

Why does the OSCAR database describe Landsats fire identification as "daylight only"?

The World Meteorological Organisation (WMO) Observing Systems Capability Analysis and Review (OSCAR) Tool describes the High-Resolution Imager (HRI) (which flies on Pléades-1A and -1B, among other ...
gerrit's user avatar
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8 votes
1 answer
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Would the subsurface event leading to tree death at West Tern Lake in Yellowstone be visible in thermal imaging?

The New York Times article It’s Warm and Stealthy, and It Killed Yellowstone Trees and Turned Soil Pale describes an even that took place over the past few decades where a small and well-defined ...
uhoh's user avatar
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8 votes
2 answers
496 views

What are these Gizmos at Izaña Atmospheric Research Center in Spain?

This tweet from the account of the Centro de Investigación Atmosférica de Izaña (AEMET) http://izana.aemet.es Izaña Atmospheric Research Center (AEMET) shows images of meteorological instruments ...
uhoh's user avatar
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1 vote
1 answer
2k views

Where are old Himawari weather satellite images available to the public? Is the 18-Dec-2018 Bearing Sea fireball still there?

In Scott Manley's new video 173 Kiloton Explosion Over Bering Sea Was Asteroid Breaking Up a bit after 01:30 he says The good news is that in these days of near-...
uhoh's user avatar
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6 votes
2 answers
212 views

Time standard for IERS Bulletin A

IERS Bulletin A and Bulletin B contains Earth orientation parameters. These include the time difference between UT1 and UTC and pole position. The values for these parameters are listed once per day, ...
David Hammen's user avatar
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3 votes
1 answer
219 views

What are these Gizmos at Mauna Loa Observatory?

Artist Rosten Wu's Vimeo channel has a video title Bridging Time and there is discussion about the Keeling Curve and the site where it all began in Hawaii. In the video there is a shot of a weather ...
uhoh's user avatar
  • 7,072
0 votes
1 answer
65 views

Artefacts in PERSIANN-CCS data

I downloaded PERSIANN-CCS for the region of Pawlowdar, Kazakhstan and this has stripes all over my downloaded data. For another AOI in Kazakhstan I do not have this problem. Does anyone of you have ...
ExploreR's user avatar
  • 101
3 votes
0 answers
27 views

The differences on the atmospheric transportation for various trace metal in atmosphere

I have known that the atmospheric lifetimes of chemical species were highly dependent on their physicochemical properties. For example, $SO_2$ might exist for 5-8 days, while $NO_2$ could only exist ...
Han Zhengzu's user avatar
  • 2,459
8 votes
1 answer
407 views

Seeming correlation between time of day and earthquakes

I live in a generally geographically active area (Southern California, near the San Andreas fault, if that matters), that has had two relatively minor earthquakes that I have felt in the last week (in ...
sharur's user avatar
  • 183
7 votes
1 answer
503 views

What physical measurement / elevation is used to define Earth's radius?

Earth's radius is usually given as 6378137 meters (equatorial radius), its flattening is defined as 1/298.257223 (WGS84), and thus its polar radius is calculated as 6356752 meters. However, the ...
pr1268's user avatar
  • 327
5 votes
1 answer
667 views

Every 202,500 years, Earth wanders in a new direction; does it affect climate?

I refer to this article on nytimes.com: Every 202,500 Years, Earth Wanders in a New Direction TLDR: Scientists believe the earth's orbit oscillates between circular and more elliptical due to the ...
Hessnov's user avatar
  • 151
1 vote
3 answers
6k views

Effects of CERN on earth's magnetic field?

CERN is a scientific site developed to create anti matter. Does this have any negative impact on the environment?
Jeffrey Boettger's user avatar