MarshallSolarActivityFutureEstimation (ORbit Extrapolation KIT 9.3.1 API)

java.lang.Object
- org.orekit.forces.drag.atmosphere.data.MarshallSolarActivityFutureEstimation

All Implemented Interfaces:

Serializable, DataLoader, DTM2000InputParameters, NRLMSISE00InputParameters
```
public class MarshallSolarActivityFutureEstimation
extends Object
implements DataLoader, DTM2000InputParameters, NRLMSISE00InputParameters
```
This class reads and provides solar activity data needed by atmospheric models: F107 solar flux, Ap and Kp indexes.
The data are retrieved through the NASA Marshall Solar Activity Future Estimation (MSAFE) as estimates of monthly F10.7 Mean solar flux and Ap geomagnetic parameter. The data can be retrieved at the NASA Marshall Solar Activity website. Here Kp indices are deduced from Ap indexes, which in turn are tabulated equivalent of retrieved Ap values.

If several MSAFE files are available, some dates may appear in several files (for example August 2007 is in all files from the first one published in March 1999 to the February 2008 file). In this case, the data from the most recent file is used and the older ones are discarded. The date of the file is assumed to be 6 months after its first entry (which explains why the file having August 2007 as its first entry is the February 2008 file). This implies that MSAFE files must not be edited to change their time span, otherwise this would break the old entries overriding mechanism.

With these data, the getInstantFlux(AbsoluteDate) and getMeanFlux(AbsoluteDate) methods return the same values and the get24HoursKp(AbsoluteDate) and getThreeHourlyKP(AbsoluteDate) methods return the same values.

Conversion from Ap index values in the MSAFE file to Kp values used by atmosphere models is done using Jacchia's equation in [1].

With these data, the getAp(AbsoluteDate date) method returns an array of seven times the same daily Ap value, i.e. it is suited to be used only with the NRLMSISE00 atmospheric model where the switch #9 is set to 1.

References
1. Jacchia, L. G. "CIRA 1972, recent atmospheric models, and improvements in progress." COSPAR, 21st Plenary Meeting. Vol. 1. 1978.
Author:

Bruno Revelin, Luc Maisonobe, Evan Ward, Pascal Parraud

See Also:

Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class MarshallSolarActivityFutureEstimation.StrengthLevel
Strength level of activity.

Nested Classes
Modifier and Type	Class	Description
`static class`	`MarshallSolarActivityFutureEstimation.StrengthLevel`	Strength level of activity.

Constructor Summary

Constructors
Constructor	Description
`MarshallSolarActivityFutureEstimation(String supportedNames, MarshallSolarActivityFutureEstimation.StrengthLevel strengthLevel)`	Simple constructor.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`double`	`get24HoursKp(AbsoluteDate date)`	The Kp index is derived from the Ap index.
`double[]`	`getAp(AbsoluteDate date)`	Get the A_p geomagnetic indices.
`double`	`getAverageFlux(AbsoluteDate date)`	Get the value of the 81 day average of F10.7 solar flux centered on current day.
`double`	`getDailyFlux(AbsoluteDate date)`	Get the value of the daily F10.7 solar flux for previous day.
`DateComponents`	`getFileDate(AbsoluteDate date)`	Get the date of the file from which data at the specified date comes from.
`double`	`getInstantFlux(AbsoluteDate date)`	Get the value of the instantaneous solar flux.
`AbsoluteDate`	`getMaxDate()`	Gets the available data range maximum date.
`double`	`getMeanFlux(AbsoluteDate date)`	Get the value of the mean solar flux.
`AbsoluteDate`	`getMinDate()`	Gets the available data range minimum date.
`MarshallSolarActivityFutureEstimation.StrengthLevel`	`getStrengthLevel()`	Get the strength level for activity.
`String`	`getSupportedNames()`	Get the supported names for data files.
`double`	`getThreeHourlyKP(AbsoluteDate date)`	Get the value of the 3 hours geomagnetic index.
`void`	`loadData(InputStream input, String name)`	Load data from a stream.
`boolean`	`stillAcceptsData()`	Check if the loader still accepts new data.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - MarshallSolarActivityFutureEstimation
```
public MarshallSolarActivityFutureEstimation(String supportedNames,
                                             MarshallSolarActivityFutureEstimation.StrengthLevel strengthLevel)
```
    Simple constructor.
    The original file names used by NASA Marshall space center are of the form: Dec2010F10.txt or Oct1999F10.TXT. So a recommended regular expression for the supported name that work with all published files is: "(?:Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\\p{Digit}\\p{Digit}\\p{Digit}\\p{Digit}F10\\.(?:txt|TXT)"
    
    Parameters:
    
    supportedNames - regular expression for supported files names
    
    strengthLevel - selected strength level of activity
- Method Detail
  - getStrengthLevel
```
public MarshallSolarActivityFutureEstimation.StrengthLevel getStrengthLevel()
```
    Get the strength level for activity.
    
    Returns:
    
    strength level to set
  - getSupportedNames
```
public String getSupportedNames()
```
    Get the supported names for data files.
    
    Returns:
    
    regular expression for the supported names for data files
  - getMinDate
```
public AbsoluteDate getMinDate()
```
    Gets the available data range minimum date.
    
    Specified by:
    
    getMinDate in interface DTM2000InputParameters
    
    Specified by:
    
    getMinDate in interface NRLMSISE00InputParameters
    
    Returns:
    
    the minimum date.
  - getMaxDate
```
public AbsoluteDate getMaxDate()
```
    Gets the available data range maximum date.
    
    Specified by:
    
    getMaxDate in interface DTM2000InputParameters
    
    Specified by:
    
    getMaxDate in interface NRLMSISE00InputParameters
    
    Returns:
    
    the maximum date.
  - getInstantFlux
```
public double getInstantFlux(AbsoluteDate date)
```
    Get the value of the instantaneous solar flux.
    
    Specified by:
    
    getInstantFlux in interface DTM2000InputParameters
    
    Parameters:
    
    date - the current date
    
    Returns:
    
    the instantaneous solar flux
  - getMeanFlux
```
public double getMeanFlux(AbsoluteDate date)
```
    Get the value of the mean solar flux.
    
    Specified by:
    
    getMeanFlux in interface DTM2000InputParameters
    
    Parameters:
    
    date - the current date
    
    Returns:
    
    the mean solar flux
  - getThreeHourlyKP
```
public double getThreeHourlyKP(AbsoluteDate date)
```
    Get the value of the 3 hours geomagnetic index. With a delay of 3 hours at pole to 6 hours at equator using: delay=6-abs(lat)*0.033 (lat in deg.)
    
    Specified by:
    
    getThreeHourlyKP in interface DTM2000InputParameters
    
    Parameters:
    
    date - the current date
    
    Returns:
    
    the 3H geomagnetic index
  - getFileDate
```
public DateComponents getFileDate(AbsoluteDate date)
```
    Get the date of the file from which data at the specified date comes from.
    If several MSAFE files are available, some dates may appear in several files (for example August 2007 is in all files from the first one published in March 1999 to the February 2008 file). In this case, the data from the most recent file is used and the older ones are discarded. The date of the file is assumed to be 6 months after its first entry (which explains why the file having August 2007 as its first entry is the February 2008 file). This implies that MSAFE files must not be edited to change their time span, otherwise this would break the old entries overriding mechanism.
    
    Parameters:
    
    date - date of the solar activity data
    
    Returns:
    
    date of the file
  - get24HoursKp
```
public double get24HoursKp(AbsoluteDate date)
```
    The Kp index is derived from the Ap index.
    The method used is explained on NOAA website. as follows:
    
    The scale is 0 to 9 expressed in thirds of a unit, e.g. 5- is 4 2/3, 5 is 5 and 5+ is 5 1/3. The ap (equivalent range) index is derived from the Kp index as follows:
    
    Kp / Ap Conversion Table
    
    Kp 0o 0+ 1- 1o 1+ 2- 2o 2+ 3- 3o 3+ 4- 4o 4+
    
    ap 0 2 3 4 5 6 7 9 12 15 18 22 27 32
    
    Kp 5- 5o 5+ 6- 6o 6+ 7- 7o 7+ 8- 8o 8+ 9- 9o
    
    ap 39 48 56 67 80 94 111 132 154 179 207 236 300 400
    
    Specified by:
    
    get24HoursKp in interface DTM2000InputParameters
    
    Parameters:
    
    date - date of the Kp data
    
    Returns:
    
    the 24H geomagnetic index
  - getDailyFlux
```
public double getDailyFlux(AbsoluteDate date)
```
    Get the value of the daily F10.7 solar flux for previous day.
    
    Specified by:
    
    getDailyFlux in interface NRLMSISE00InputParameters
    
    Parameters:
    
    date - the current date
    
    Returns:
    
    the daily F10.7 flux for previous day
  - getAverageFlux
```
public double getAverageFlux(AbsoluteDate date)
```
    Get the value of the 81 day average of F10.7 solar flux centered on current day.
    
    Specified by:
    
    getAverageFlux in interface NRLMSISE00InputParameters
    
    Parameters:
    
    date - the current date
    
    Returns:
    
    the 81 day average of F10.7 solar flux centered on current day
  - getAp
```
public double[] getAp(AbsoluteDate date)
```
    Get the A_p geomagnetic indices.
    A_p indices are provided as an array such as:
    - 0 → daily A_p
    - 1 → 3 hr A_p index for current time
    - 2 → 3 hr A_p index for 3 hrs before current time
    - 3 → 3 hr A_p index for 6 hrs before current time
    - 4 → 3 hr A_p index for 9 hrs before current time
    - 5 → Average of eight 3 hr A_p indices from 12 to 33 hrs prior to current time
    - 6 → Average of eight 3 hr A_p indices from 36 to 57 hrs prior to current time
    Specified by:
    
    getAp in interface NRLMSISE00InputParameters
    
    Parameters:
    
    date - the current date
    
    Returns:
    
    the array of A_p indices
  - loadData
```
public void loadData(InputStream input,
                     String name)
              throws IOException,
                     ParseException,
                     OrekitException
```
    Load data from a stream.
    
    Specified by:
    
    loadData in interface DataLoader
    
    Parameters:
    
    input - data input stream
    
    name - name of the file (or zip entry)
    
    Throws:
    
    IOException - if data can't be read
    
    ParseException - if data can't be parsed or if some loader specific error occurs
    
    OrekitException
  - stillAcceptsData
```
public boolean stillAcceptsData()
```
    Check if the loader still accepts new data.
    This method is used to speed up data loading by interrupting crawling the data sets as soon as a loader has found the data it was waiting for. For loaders that can merge data from any number of sources (for example JPL ephemerides or Earth Orientation Parameters that are split among several files), this method should always return true to make sure no data is left over.
    
    Specified by:
    
    stillAcceptsData in interface DataLoader
    
    Returns:
    
    true while the loader still accepts new data

Kp	0o	0+	1-	1o	1+	2-	2o	2+	3-	3o	3+	4-	4o	4+
ap	0	2	3	4	5	6	7	9	12	15	18	22	27	32
Kp	5-	5o	5+	6-	6o	6+	7-	7o	7+	8-	8o	8+	9-	9o
ap	39	48	56	67	80	94	111	132	154	179	207	236	300	400

Kp	0o	0+	1-	1o	1+	2-	2o	2+	3-	3o	3+	4-	4o	4+
ap	0	2	3	4	5	6	7	9	12	15	18	22	27	32
Kp	5-	5o	5+	6-	6o	6+	7-	7o	7+	8-	8o	8+	9-	9o
ap	39	48	56	67	80	94	111	132	154	179	207	236	300	400

Class MarshallSolarActivityFutureEstimation

References

Nested Class Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

MarshallSolarActivityFutureEstimation

Method Detail

getStrengthLevel

getSupportedNames

getMinDate

getMaxDate

getInstantFlux

getMeanFlux

getThreeHourlyKP

getFileDate

get24HoursKp

getDailyFlux

getAverageFlux

getAp

loadData

stillAcceptsData

Kp	0o	0+	1-	1o	1+	2-	2o	2+	3-	3o	3+	4-	4o	4+
ap	0	2	3	4	5	6	7	9	12	15	18	22	27	32
Kp	5-	5o	5+	6-	6o	6+	7-	7o	7+	8-	8o	8+	9-	9o
ap	39	48	56	67	80	94	111	132	154	179	207	236	300	400