Questions related to Ionospheric Physics
Please give an example of a scientific hypothesis about Antarctica that has not yet been confirmed. I am also interested in the gaps in scientific knowledge about Antarctica. As a member of Russian Antarctic program I am familiar with general enigmas (ice sheet stability, life in subglacial lakes, paleoclimatic records, influence of subglacial heat flows etc.). So here I would like you to share with me not so common things about Antarctica
Models of the Earth's atmosphere receive a lot of attention in today's warming climate, but models of the Earth's ionosphere are just as important. Which model incorporates more accurate methods of measuring solar activity? Attempts by numerous researchers to assess the performance of models such as IRI and NeQuick test release have yielded results that differ by regions so far. To date, which method has proven to be more accurate in predicting ionospheric parameters, particularly TEC?
I want to compare two TEC models. Except the comparison of diurnal vTEC, I want to analyze deviation in mean monthly vTEC by taking single airthematic average for whole month. While doing so, I am averaging quiet day as well as disturbed day TEC. But my study is not adressing the performance of models in disturbed or quiet day. Study is focused on overall performance. So, what I believe is if two models are predicting TEC of same location then both should give the similar average for the month. But I want to confirm, wheather other statistical factor effects the value while mixing quiet day and disturbed day TEC or not?? Is this concept significant in comparing two TEC models?
I am working with a Septrino PolaRxs GPS receiver which receives the data from GPS satellites and after some initial processing stores it in .ismr format (ISMR= Ionospheric Scintillation Monitoring Records).
Though I am able to open the data file in a notepad I don't exactly know how to read the data. Is there any program or algorithm available in matlab which can help me in reading the ismr files?
I have a set of scatter plots comparing some different data with a reference value. I'm evaluating the quality of these comparisons by analysing slope, intercept and r values. Thus, too many similar figures can make it difficult to understand.
How can I improve this?
I have been developing models of the ionosphere for some time, but recently, I've been asked "What constitutes sufficiently accurate foF2?" The URSI standard for foF2 scaling from an ionogram is 5d, where d is the frequency resolution of the ionosonde in the vicinity of foF2. Others have mentioned accuracy standards ranging between 0.5 MHz and 1.0MHz. My question is, is there a consensus within the field on the generally required accuracy of foF2? If it is application-specific, what are the necessary accuracy levels for these various applications?
In any responses, please provide references to support your point of view.
I look forward to an interesting and productive discussion.
Hello every one,
I am interested to download the 3-hourly ap indices for one day. As it gives single value for each 3-hour interval of the universal time day (UT), so there will be 8 indices in one day. Th e procedure used to select parameters is shown in the attahched figures. The problem here is, i got 9 indices instead of 8. Any help will be appreciated.
Scientist got different results if the radiation from cell phones have an influence on bees or not - may be the situation in the laboratory is not quite the same in the nature and for example if there is a problem with a geomagnetic storm there is suddendly more influence from the radiation from cell phones as on the most other days and this could explain the different results and opinions???
May be the bees react on geomagnetic storms too without radiation from cell phones? But now this influence is stronger?
I need to obtain real heights of reflection of radio waves from ionograms for the purpose of finding some numerical solutions to electron density continuity equation in the F2 region at a low latitude station.
1. Why and how does one check the stationarity of a time series?
2. How does one calculate the PSD of a time series as one in the attachment (Book1.txt)?
3. What is meant by the term "confidence limit" in context of calculating PSD?
Hello, I am looking for a figure (with reference) that is similar to the one attached (replyfig.png), which compares the day and night side ionospheric electron density profiles typical of mid-latitude. I know the high latitude ionosphere is highly variable (Ne_at_high_*.jpg), but was wondering if perhaps there was something similar from long term averages of day and night data for an instrument located somewhere between 60-80 degrees North latitude. I may look at some EISCAT data otherwise.
I am a freelance researcher interested in Ionospheric studies.I am looking for people who are working in the Earth Energy Budget. I will be happy to interact with anybody who can help me in this subject.
I would like to find data for Total Electron Content (TEC) as a function of latitude (TEC curves possibly from GPS observations). I also will need an ionospheric map (electron density as a function of altitude and latitude), possibly reconstructed from the TEC data or measured using another source such as radar. I wish to validate my raytrace program by passing rays through the ionospheric map, attempting to reproduce the previously measured TEC curve(s). Any suggestions for open-access databases or journal articles with both TEC curves and electron density maps would be greatly appreciated!
I am trying to estimate mainly the pressure but also the temperature that occurs in the plasma of an artificial current that mimics a lightning strike.
Looking forward to your answer and until then let's keep making the world a happier place!
I have a PhD student who is currently analyzing Demeter satellite data in order to assess their usefulness in earthquake and other natural disaster precursory studies. We are having problems accessing TEC data in the earthquake stricken areas. Please, we need to know if there is any TEC data depository or data bank from where we can download such data. Thanks
I am carrying out an investigation on plasma drift during the evening time, I observed that the average PRE magnitude for a complete solar cycle during the June solstice (covering May to July) peaked an hour after all other seasons had peaked. What could be responsible?
Seasonal investigations of vertical plasma drift had always shown June solstice recording the smallest magnitude.
Ionospheric horizontal gradient does effect the GPS positioning over the equatorial region. It will be great if there is a method to model the ionosphere. Great if anyone can share. Thanks
We let assume that sunspot number (SSN) ranges from 0 to 200. In this case, when SSN was greater than 50, it is solar maximum, otherwise it is solar minimum. Is this correct?
Ground-based vertical plasma drift is inferred from the time rate of change of hmF2 or h'F (the virtual height of the F-layer)
Having understood that various research has been done on equatorial eletrojet (EEJ), the daily, monthly and seasonal dependent has been studied intensively.
The equatorial/low latitude region pre-reversal enhancement (occurring at close to 1800-2000 h LT) is peerless of the features for the nighttime resurgence of the equatorial ionization anomaly, and the daytime buildup (around 0900-1000 h LT) resulted in the decrease of plasma that occurs later. The kind of changes in the nighttime and daytime I'm referring to is when the PRE and EIA build-up during the daytime peak earlier than speculated period.
Having in mind that the f2-layer peak height in some instances during quiet and low solar activity conditions can be less than 300 km.
There is not much help available online. I have attached the graph, any help would be appreciated.