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mdcayton
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HD2.R
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268
HD2.R
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# NS41 Satellite Data
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# Michael D Cayton
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# December 22, 2018
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# Last update 12-23-18
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### sum of col V81 through 99
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### 21 not 240 remove
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# number of rows, sum
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# midified Bessal function of the second kind.
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#### Load the libraries ###
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library(tidyverse)
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library(RCurl)
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library(lubridate)
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# Set the url for the ftp site working directory.
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# This is where the origianal data is stored.
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url <- 'ftp://ftp.ngdc.noaa.gov/STP/space-weather/satellite-data/satellite-systems/gps/data/ns41/'
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# Create a vector of file names from the directory
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# This will allow us to extract the dates and will be used to create a master file.
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filename <- getURL(url, dirlistonly = TRUE)
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filename
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# Clean up the file list
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destnames <- strsplit(filename, "\r*\n")[[1]]
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destnames
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# Create data frame for the data.
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ns41 = NULL
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ns41 <- tbl_df(ns41)
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# For loop to access each file, combine into one dataframe, and add a column for the filename date
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l <- length(destnames)
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data <- NULL
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i <- NULL
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for (i in 1:l) {
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data <- read.table(file = paste(url, destnames[i], sep=""))
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data$Date <- as.Date(str_sub(destnames[i], start=6, end=11), "%y%m%d")
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ns41 <- rbind(ns41, data)
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print(paste(i, "of", l, "complete"))
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}
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# Save table.
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write_csv(ns41, path="/Users/mdcay/Documents/Happy Dad/ns41.csv")
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#Import raw data as needed.
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ns41 <- read_csv(file="/Users/mdcay/Documents/Happy Dad/ns41.csv")
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ns41 <- tbl_df(ns41)
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# Select for V21 = 240
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ns41 <- ns41 %>% filter(V21 == 240)
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# Create table, grouped by unique week, and sum of V81 through V99
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ns41_sums <- ns41 %>% group_by(Date) %>%
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select(Date,V25, V82:V100) %>%
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summarise(n=n(),
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V24=sum(V25),
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V81=sum(V82),
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V82=sum(V83),
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V83=sum(V84),
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V84=sum(V85),
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V85=sum(V86),
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V86=sum(V87),
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V87=sum(V88),
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V88=sum(V89),
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V89=sum(V90),
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V90=sum(V91),
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V91=sum(V92),
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V92=sum(V93),
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V93=sum(V94),
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V94=sum(V95),
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V95=sum(V96),
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V96=sum(V97),
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V97=sum(V98),
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V98=sum(V99),
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V99=sum(V100)
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)
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write_csv(ns41_sums, path='ns41_sums.csv')
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ns41_sums <- read_csv(file="/Users/mcayton/Documents/Happy Dad/ns41_sums.csv")
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# Create a list of the energy levels. These can be found in V100 through V130.
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energies <- c(.6, .7, .8, .9, 1, 1.25, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 6, 7, 8, 9, 10)
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# Use Modified Bessel function of the second kind. Each V81-V99 row is an interval and go with the energy list.
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x <- ns41_sums %>% select(-Date, -n)
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nu <- as.numeric(x[1,])
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bessel <- besselK(nu, energies)
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bessel
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ggplot() +
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geom_line(aes(nu, energies))
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### sum of col V81 through 99
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### 21 not 240 remove
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# number of rows, sum
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# midified Bessal function of the second kind. ### sum of col V81 through 99
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### 21 not 240 remove
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# number of rows, sum
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### JSON with table info ###
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# test <- fromJSON('{
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# "decimal_day": { "DESCRIPTION":"Decimal Day of year",
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# "DIMENSION": [1],
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# "UNITS": "days",
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# "START_COLUMN": 0
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# },
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#
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# "Geographic_Latitude": { "DESCRIPTION":"Geographic_Latitude",
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# "DIMENSION": [1],
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# "UNITS": "degrees",
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# "START_COLUMN": 1
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# },
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# "Geographic_Longitude": { "DESCRIPTION":"Geographic_Longitude",
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# "DIMENSION": [1],
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# "UNITS": "degrees",
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# "START_COLUMN": 2
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# },
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# "Rad_Re": { "DESCRIPTION":"Radius (earth radii)",
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# "DIMENSION": [1],
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# "UNITS": "R_E",
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# "START_COLUMN": 3
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# },
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# "rate_electron_measured": { "DESCRIPTION":"rate_electron_measured",
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# "DIMENSION": [8],
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# "UNITS": "hertz",
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# "START_COLUMN": 4
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# },
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# "rate_proton_measured": { "DESCRIPTION":"rate_proton_measured",
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# "DIMENSION": [8],
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# "UNITS": "hertz",
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# "START_COLUMN": 12
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# },
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# "collection_interval": { "DESCRIPTION":"collection_interval",
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# "DIMENSION": [1],
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# "UNITS": "seconds",
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# "START_COLUMN": 20
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# },
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# "year": { "DESCRIPTION":"year eg 2015",
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# "DIMENSION": [1],
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# "UNITS": "years",
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# "START_COLUMN": 21
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# },
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# "decimal_year": { "DESCRIPTION":"decimal_year contains fractional part of year",
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# "DIMENSION": [1],
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# "UNITS": "years",
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# "START_COLUMN": 22
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# },
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# "svn_number": { "DESCRIPTION":"SVN number",
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# "DIMENSION": [1],
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# "UNITS": "none",
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# "START_COLUMN": 23
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# },
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# "dropped_data": { "DESCRIPTION":"dropped_data=1 means ignore data",
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# "DIMENSION": [1],
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# "UNITS": "none",
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# "START_COLUMN": 24
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# },
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# "b_coord_radius": { "DESCRIPTION":"radius from earths dipole axis",
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# "DIMENSION": [1],
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# "UNITS": "R_E",
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# "START_COLUMN": 25
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# },
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# "b_coord_height": { "DESCRIPTION":"height above earths equatorial plane",
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# "DIMENSION": [1],
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# "UNITS": "R_E",
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# "START_COLUMN": 26
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# },
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# "magnetic_longitude": { "DESCRIPTION":"magnetic longitude",
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# "DIMENSION": [1],
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# "UNITS": "degrees",
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# "START_COLUMN": 27
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# },
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# "L_shell": { "DESCRIPTION":"L shell, dipole file, T89",
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# "DIMENSION": [1],
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# "UNITS": "R_E",
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# "START_COLUMN": 28
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# },
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# "bfield_ratio": { "DESCRIPTION":"Bsatellite/Bequator",
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# "DIMENSION": [1],
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# "UNITS": "none",
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# "START_COLUMN": 29
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# },
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# "local_time": { "DESCRIPTION":"Magnetic local time",
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# "DIMENSION": [1],
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# "UNITS": "h",
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# "START_COLUMN": 30
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# },
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# "b_sattelite": { "DESCRIPTION":" field at satellite",
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# "DIMENSION": [1],
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# "UNITS": "gauss",
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# "START_COLUMN": 31
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# },
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# "b_equator": { "DESCRIPTION":"B field at equator",
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# "DIMENSION": [1],
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# "UNITS": "gauss",
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# "START_COLUMN": 32
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# },
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# "diffp": { "DESCRIPTION":"not sure what this is",
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# "DIMENSION": [1],
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# "UNITS": "gauss",
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# "START_COLUMN": 33
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# },
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# "sigmap": { "DESCRIPTION":"not sure what this is",
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# "DIMENSION": [1],
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# "UNITS": "gauss",
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# "START_COLUMN": 34
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# },
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# "electron_background": { "DESCRIPTION":"electron_background estimated",
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# "DIMENSION": [8],
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# "UNITS": "hertz",
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# "START_COLUMN": 35
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# },
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# "proton_background": { "DESCRIPTION":"proton_background estimated",
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# "DIMENSION": [8],
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# "UNITS": "hertz",
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# "START_COLUMN": 43
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# },
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# "proton_activity": { "DESCRIPTION":"proton_activity=1 if proton activity is occurring",
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# "DIMENSION": [1],
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# "UNITS": "none",
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# "START_COLUMN": 51
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# },
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# "electron_temperature_fit": { "DESCRIPTION":"electron temperature from Maxwellian fit",
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# "DIMENSION": [1],
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# "UNITS": "MeV",
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# "START_COLUMN": 52
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# },
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# "electron_density_fit": { "DESCRIPTION":"electron number density fit",
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# "DIMENSION": [1],
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# "UNITS": "cm^-3",
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# "START_COLUMN": 53
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# },
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# "model_counts_electron_fit": { "DESCRIPTION":"E1-E8 rates from Maxwellian fit",
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# "DIMENSION": [8],
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# "UNITS": "hertz",
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# "START_COLUMN": 54
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# },
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# "dtc_counts_electron": { "DESCRIPTION":"E1-E8 rates dead time corrected",
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# "DIMENSION": [8],
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# "UNITS": "hertz",
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# "START_COLUMN": 62
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# },
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# "integral_flux_instrument": { "DESCRIPTION":"integral of electron flux fit above integral_flux_energy[i]",
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# "DIMENSION": [30],
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# "UNITS": "cm^-2sec^-1sr^-1",
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# "START_COLUMN": 70
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# },
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# "integral_flux_energy": { "DESCRIPTION":"energies for integral_flux_instrument",
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# "DIMENSION": [30],
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# "UNITS": "MeV",
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# "START_COLUMN": 100
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# },
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# "electron_diff_flux_energy": { "DESCRIPTION":"energies for the fluxes in electron_diff_flux_energy",
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# "DIMENSION": [15],
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# "UNITS": "MeV",
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# "START_COLUMN": 130
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# },
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# "electron_diff_flux": { "DESCRIPTION":"electron flux at energies electron_diff_flux[i]",
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# "DIMENSION": [15],
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# "UNITS": "cm^-2sec^-1sr^-1MeV^-1",
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# "START_COLUMN": 145
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# }
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# }')
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