This directory contains the annual ASCII files of the set of spacecraft magnetopause crossing data. (See Table 1 below for set of spacecraft and time ranges) The FTPBrowser and the text below show the record format and describes the multiple parameters in the records. There is one record per magnetopause crossing. Words 1-10 characterize the time and location of a magnetopause crossing. Words 11-34 characterize the state of the solar wind for the hour in which the crossing occurred; they are taken or computed from the hourly resolution OMNI data base (http://nssdc.gsfc.nasa.gov/omniweb/). The later words(35-38) are geomagnetic and solar activity indices. Fill values of strings of 9's (filled out to the format of the relevant parameters) were used. The word 39 is source code, see Table 2 below Creation of this data set and the FTPBrowser interface were supported by the NASA LWS TR&T Research Program. [Grant Principal Investigator: Ramona Kessel ] The records are in ASCII. All columns have an extra character (e.g., I4 for day number) to allow for spaces on printing and to allow for unformatted reads by IDL and other software. Word Name Format Comments 1 S/c A2 Spacecraft ID (see Table 1) 2 Year I5 YYYY 3 Dayofyr I4 DOY (1, 2, ... 365, 366) 4 Hour I3 HH (0, 1, ... 23) 5 Minute I3 MM (0, 1, ... 59) see footnote 1 6 Xgse F8.2 Spacecraft position Xgse, units = Re 7 Ygse F8.2 Spacecraft position Ygse, Re 8 Zgse F8.2 Spacecraft position Zgse, Re 9 Ygsm F8.2 Spacecraft position Ygsm, Re 10 Zgsm F8.2 Spacecraft position Ygsz, Re 11 |B| F6.1 Upstream magnitude Avg (scalar), nT 12 Bt F6.1 Upstream magnetic field intensity, nT, see footnote 2 13 Bxgse F6.1 Xgse component of upstream magnetic field vector, 14 Bygse F6.1 Ygse component of upstream magnetic field vector 15 Bzgse F6.1 Zgse component of upstream magnetic field vector 16 Bygsm F6.1 Ygsm component of upstream magnetic field vector 17 Bzgsm F6.1 Zgsm component of upstream magnetic field vector 18 Flow spd I6 Upstream flow speed, km/s, see footnote 7 19 Vxgse I6 -Xgse component of upstream sw velocity, km/s, see footnote 3 20 Vygse I6 -Ygse component of upstream sw velocity, km/s, see footnote 3 21 Vzgse I6 -Zgse component of upstream sw velocity, km/s, see footnote 3 22 Tempature I8 Upstream proton temperature (deg K) 23 Density F6.1 Upstream solar wind proton density (cm**-3) 24 FlPres F6.2 Upstream flow pressure, nPa, see footnote 4 25 Ey F7.2 Electric Field, mV/m footnote 5 26 Beta F8.2 Upstream plasma beta, see footnote 6 27 Alfvnspd F7.1 Upstream Alfven speed, km/s, see footnote 7 28 Soundspd F7.1 Upstream sound speed, km/s, see footnote 8 29 M'sonspd F7.1 Upstream magnetosonic speed, km/s, see footnote 9 30 Ma F6.1 Upstream Alfven Mach number, (wd 25)/(wd 27 31 Ms F5.1 Upstream sonic Mach number, (wd 25)/(wd 26) 32 Mms F5.1 Upstream magnetosonic Mach number, (wd 25)/(wd 28) 33 IMFcone I4 IMF cone angle, deg, see footnote 10 34 IMFclck I4 IMF clock angle, deg, see footnote 11 35 Kp I3 3-hr Kp (Kp*10)index from NGDC 36 R I4 Daily Sunspot Number from NGDC 37 Dst Index, I6 Hourly Dst-index, nT, from NGDC provisional when? 38 AE Index, I5 Hourly AE-index, nT, provisional when? 39 Source code I3 See table 1 below Footnotes 1. In general, the minute given is that in/during which the crossing is observed. For 'extended' crossings, the minute given generally corresponds to the beginning of the magnetopause interval. For multiple crossings in the early IMP data submitted by Fairfield, sometimes an 'average position' was selected by visually determining the point that equalized the magnetosphere time outside the point with the magnetosheath time inside the point; the minute given corresponds to the 'average position'. 2. The field intensity is [Bx**2+By**2+Bz**2]**0.5 (wds 13-15 --> wd 12) 3. The Xgse component of the solar wind velocity vector is negative. To avoid negative values for this component, we have chosen to give components for the vector anti-aligned with the velocity vector. 4. Flow pressure = (2.0/10**6) * N * V**2 (wds 23, 18 --> wd 24) (note that this 2.0 includes a 5% alpha contribution) 5. Electric field= V(km/s) * Bz (nT; GSM) * 10**-3 6. Plasma beta = [(T*4.16/10**5) + 5.34] * N / B**2 (wds 22, 23, 12 --> wd 26) 7. The Alfven speed = 20. * B / N**0.5 (wds 12, 23 --> wd 27) 8. The sound speed = 0.12 * [T + 1.28*10**5]**0.5 (wd 22 --> wd 28) 9. Magnetosonic speed = [(sound speed)**2 + (Alfv speed)**2]**0.5 (wds 28, 27 --> wd 29) 10. IMF cone angle = 57.3 * arc cos [|Bx|/Bt] (wds 13, 12 --> wd 33) 11. IMF clock angle = 57.3 * arc tan [|Bygsm|/Bzgsm] (wds 16, 17 --> wd 34) ------------------------------------------------------------------------ Table 1: List of spacecraft and time span S/c name ID Time span AMPTE CCE (A1) [1984-1986,1988] AMPTE IRM (A2) [1984 - 1986] Explorer33 (E3) [1966-1968] Geotail (GE) [1992-1994] Hawkeye (HW) [1974-1977] HEOS2 (H2) [1972-1973] IMP1 (I1) [1963-1964] IMP2 (I2) [1964] IMP3 (I3) [1965-1966] IMP4 (I4) [1967-1968] IMP6 (I6) [1971-1974] IMP8 (I8) [1973-75,1977-79,1994-98] ISEE (IS) [1977-1979] OGO-5 (O5) [1968-1969] Prognoz7 (P7) [1978-1979] Prognoz8 (P8) [1981] Prognoz10 (P1) [1985] ----------------------------------------------------------- Table 2: List of providers (Source code) 1 D. Fairfield 2 N. Crooker, G. Paschman, G. Haerendel 3 J. Slavin 4 T. Eastman 5 A. T. Y. Lui 6 R. Rijnbeck 7 G. Zastenker 8 T. Eastman, S. Christon 9 H. Hasegawa 10 D. G. Sibeck, A. Davis 11 no source given 12 S. Boardsen, T. Eastman ---------------------------------------------------- Acknowledgement: Use of these data in publications should be accompanied by acknowledgements to Space Physics Data Facility(SPDF/GSFC) ------------------------------------------------------------------------- contact scientists: Dr. Ramona Kessel E-mail: ramona.l.kessel@nasa.gov Dr. Natalia Papitashvili E-mail: Natalia Papitashvili Code 672,GSFC/NASA, Greenbelt, MD, 20771. --------------------------------------------------------------------------- Related data and directories: SPDF Data and Orbits Services ------------------------------------------------------------------------- Authorizing NASA Official: Dr. R.E. McGuire, Head, SPDF, NASA Goddard Space Flight Center 301-286-7794, e-mail: Robert.E.McGuire@nasa.gov